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https://issues.apache.org/jira/browse/SPARK-1834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156477#comment-14156477
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Sean Owen commented on SPARK-1834:
----------------------------------
Weird, I can reproduce this. I have a new test case for {{JavaAPISuite}} and am
investigating. It compiles fine but fails at runtime. I sense Scala shenanigans.
> NoSuchMethodError when invoking JavaPairRDD.reduce() in Java
> ------------------------------------------------------------
>
> Key: SPARK-1834
> URL: https://issues.apache.org/jira/browse/SPARK-1834
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 0.9.1
> Environment: Redhat Linux, Java 7, Hadoop 2.2, Scala 2.10.4
> Reporter: John Snodgrass
>
> I get a java.lang.NoSuchMethod error when invoking JavaPairRDD.reduce(). Here
> is the partial stack trace:
> Exception in thread "main" java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> org.apache.spark.deploy.worker.DriverWrapper$.main(DriverWrapper.scala:39)
> at
> org.apache.spark.deploy.worker.DriverWrapper.main(DriverWrapper.scala)
> Caused by: java.lang.NoSuchMethodError:
> org.apache.spark.api.java.JavaPairRDD.reduce(Lorg/apache/spark/api/java/function/Function2;)Lscala/Tuple2;
> at JavaPairRDDReduceTest.main(JavaPairRDDReduceTest.java:49) ...
> I'm using Spark 0.9.1. I checked to ensure that I'm compiling with the same
> version of Spark as I am running on the cluster. The reduce() method works
> fine with JavaRDD, just not with JavaPairRDD. Here is a code snippet that
> exhibits the problem:
> ArrayList<Integer> array = new ArrayList<>();
> for (int i = 0; i < 10; ++i) {
> array.add(i);
> }
> JavaRDD<Integer> rdd = javaSparkContext.parallelize(array);
> JavaPairRDD<String, Integer> testRDD = rdd.map(new
> PairFunction<Integer, String, Integer>() {
> @Override
> public Tuple2<String, Integer> call(Integer t) throws Exception {
> return new Tuple2<>("" + t, t);
> }
> }).cache();
>
> testRDD.reduce(new Function2<Tuple2<String, Integer>, Tuple2<String,
> Integer>, Tuple2<String, Integer>>() {
> @Override
> public Tuple2<String, Integer> call(Tuple2<String, Integer> arg0,
> Tuple2<String, Integer> arg1) throws Exception {
> return new Tuple2<>(arg0._1 + arg1._1, arg0._2 * 10 + arg0._2);
> }
> });
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