[
https://issues.apache.org/jira/browse/FLINK-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194461#comment-14194461
]
ASF GitHub Bot commented on FLINK-1203:
---------------------------------------
GitHub user StephanEwen opened a pull request:
https://github.com/apache/incubator-flink/pull/174
[FLINK-1203] Deactivate fork reuse in tests ()
Works around a potential surefire bug where we see confused class cast
exceptions
```
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)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/StephanEwen/incubator-flink fork_false
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-flink/pull/174.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #174
----
commit 21d3bdbc8d61e1d2712fe396d3fed4258f5c3b8b
Author: Stephan Ewen <[email protected]>
Date: 2014-11-03T11:27:03Z
[FLINK-1203] Deactivate fork reuse in tests (workaround for potential
surefire bug)
----
> 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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