Stephan Ewen created FLINK-1203:
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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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