[jira] [Commented] (SPARK-13546) GBT with many trees consistently giving java.lang.StackOverflowError

[Glen Maisey (JIRA)]

    [ 
https://issues.apache.org/jira/browse/SPARK-13546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173261#comment-15173261
 ] 

Glen Maisey commented on SPARK-13546:
-------------------------------------

As a workaround I've thrown checkpointing on. It seems to truncate the DAG such 
that it doesn't crash.

{code}

// first line we add a checkpoint directory
sc.setCheckpointDir("mydir")

...
// we add CheckpointInterval and cache node ids
val gbt = new 
GBTRegressor().setMaxIter(1000).setStepSize(0.001).setMaxDepth(3).setMaxMemoryInMB(256).setMinInstancesPerNode(5).setSubsamplingRate(0.8).setMaxBins(10)
   .setCheckpointInterval(50).setCacheNodeIds(true)

...
{code}

Feels like the checkpointing might need to be compulsory for very iterative 
algorithms like the gbt.

> GBT with many trees consistently giving java.lang.StackOverflowError
> --------------------------------------------------------------------
>
>                 Key: SPARK-13546
>                 URL: https://issues.apache.org/jira/browse/SPARK-13546
>             Project: Spark
>          Issue Type: Bug
>          Components: ML
>    Affects Versions: 1.6.0
>            Reporter: Glen Maisey
>         Attachments: iris.csv
>
>
> I've found that creating a GBT in SparkML with a large number of trees is 
> causing a stackoverflow error. The same code works with a smaller number of 
> trees. This was occurring on a large dataset however I've reproduced the 
> error using the tiny Fisher's Iris dataset to make it a bit easier to debug 
> (https://en.wikipedia.org/wiki/Iris_flower_data_set).
> Unfortunately I do not have the skills to fix the issue, just reproduce it. 
> Let me know if there are things I could test. Thanks!
> Edit: I've already tried increasing the JVM stack size significantly and that 
> doesn't solve the problem.
> {code}
> // Import
> import org.apache.spark.ml.Pipeline
> import org.apache.spark.ml.evaluation.RegressionEvaluator
> import org.apache.spark.ml.feature.RFormula
> import org.apache.spark.ml.regression.GBTRegressor
> // Load Data & specify model
> val data = 
> sqlContext.read.format("com.databricks.spark.csv").option("header", 
> "true").option("inferSchema", "true").load("/user/glenm/iris.csv")
> val formulaString = "SepalLength ~ SepalWidth + PetalLength + PetalWidth + 
> Species"
> // Setup R Formula
> val formula = new RFormula().setFormula(formulaString)
>     
> // Setup evaluation metric
> val evaluator = new 
> RegressionEvaluator().setLabelCol("label").setPredictionCol("prediction").setMetricName("rmse")
>  
> val pipeline = new Pipeline().setStages(Array(formula))        
> // Transform the data 
> val pipelineModel = pipeline.fit(data)
> val transformedData = pipelineModel.transform(data).select("features","label")
> // Split our data into test and train
> val Array(train, test) = transformedData.randomSplit(Array(0.9, 0.1))
> // Cache our training data
> val trainingData = train.repartition(2).cache()
> trainingData.count()
> // Setup GBT
> val gbt = new 
> GBTRegressor().setMaxIter(1000).setStepSize(0.001).setMaxDepth(3).setMaxMemoryInMB(256).setMinInstancesPerNode(5).setSubsamplingRate(0.8).setMaxBins(10)
> // Create the GBT   
> val myGBM = gbt.fit(trainingData)
> {code}
> Stack trace:
> java.lang.StackOverflowError
>       at 
> java.io.ObjectStreamClass.getPrimFieldValues(ObjectStreamClass.java:1233)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1532)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at 
> scala.collection.mutable.HashMap$$anonfun$writeObject$1.apply(HashMap.scala:137)
>       at 
> scala.collection.mutable.HashMap$$anonfun$writeObject$1.apply(HashMap.scala:135)
>       at 
> scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
>       at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
>       at 
> scala.collection.mutable.HashTable$class.serializeTo(HashTable.scala:124)
>       at scala.collection.mutable.HashMap.serializeTo(HashMap.scala:39)
>       at scala.collection.mutable.HashMap.writeObject(HashMap.scala:135)
>       at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>       at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
>       at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>       at 
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>       at 
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>       at 
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)



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