Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/22186
My local build wasn't including that module; it now does and the link works
with a subclass of `AbstractFunction0<BoxUnit>`.
The local tests are failing under maven with hive/jackson mismatch though.
I'm going to consider that a separate issue.
```
#c=cvalue;d=dvalue
- SPARK-16563 ThriftCLIService FetchResults repeat fetching result ***
FAILED ***
java.sql.SQLException: java.lang.NoSuchMethodError:
org.json4s.jackson.JsonMethods$.parse$default$3()Z
at org.apache.hive.jdbc.HiveStatement.execute(HiveStatement.java:296)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftJdbcTest$$anonfun$withMultipleConnectionJdbcStatement$2.apply(HiveThriftServer2Suites.scala:814)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftJdbcTest$$anonfun$withMultipleConnectionJdbcStatement$2.apply(HiveThriftServer2Suites.scala:813)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:35)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftJdbcTest.withMultipleConnectionJdbcStatement(HiveThriftServer2Suites.scala:813)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftJdbcTest.withJdbcStatement(HiveThriftServer2Suites.scala:822)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftBinaryServerSuite$$anonfun$2$$anonfun$apply$mcV$sp$2.apply(HiveThriftServer2Suites.scala:100)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftBinaryServerSuite$$anonfun$2$$anonfun$apply$mcV$sp$2.apply(HiveThriftServer2Suites.scala:96)
at
org.apache.spark.sql.hive.thriftserver.HiveThriftBinaryServerSuite.org$apache$spark$sql$hive$thriftserver$HiveThriftBinaryServerSuite$$withCLIServiceClient(HiveThriftServer2Suites.scala:71)
```
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