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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1203) ClassCast exceptions in parallel tests (Surefire Bug?)
Date Mon, 03 Nov 2014 11:24:33 GMT
Stephan Ewen created FLINK-1203:
-----------------------------------

             Summary: ClassCast exceptions in parallel tests (Surefire Bug?)
                 Key: FLINK-1203
                 URL: https://issues.apache.org/jira/browse/FLINK-1203
             Project: Flink
          Issue Type: Bug
          Components: Build System
    Affects Versions: 0.8-incubating
            Reporter: Stephan Ewen
             Fix For: 0.8-incubating


I am frequently seeing weird (non-deterministic) class cast exception in the tests, where
apparently casts fail in serial parts of the program. The casting attempts have nothing to
do with the program context.

{code}
java.lang.ClassCastException: org.apache.flink.api.common.operators.base.DeltaIterationBase
cannot be cast to org.apache.flink.api.common.operators.base.GroupReduceOperatorBase
	at org.apache.flink.api.scala.operators.translation.DistinctTranslationTest.testCombinable(DistinctTranslationTest.scala:39)
{code}

I am wondering whether that might be a strange bug in the forked execution, a possible bug
in maven surefire.

I propose to deactivate the "reuseFork" option in surefire, to create a clean JVM (and class
loaders) for each test.



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