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https://issues.apache.org/jira/browse/FLINK-1701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14364789#comment-14364789
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Stephan Ewen commented on FLINK-1701:
-------------------------------------
Is it one of these cases?
http://ci.apache.org/projects/flink/flink-docs-release-0.8.1/faq.html#why-am-i-getting-a-nonserializableexception-
> Serialization problems with TestStreamEnvironment
> -------------------------------------------------
>
> Key: FLINK-1701
> URL: https://issues.apache.org/jira/browse/FLINK-1701
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Péter Szabó
>
> When mapWindowing a stream of tuples of a custom class with
> TestStreamEnvironment, serialization of StreamDiscretizer fails in
> StreamConfig.
> [Example
> here|https://github.com/mbalassi/flink/blob/6682762bca7b08cb87c68ee4b2ee592a5da3479e/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/DeltaWithCustomClassTest.java]
> The same example runs with StreamExecutionEnvironment without any problem.
> I'm wondering what is the difference.
> StackTrace:
> java.lang.RuntimeException: Cannot serialize invokable object class
> org.apache.flink.streaming.api.invokable.operator.windowing.StreamDiscretizer
> at
> org.apache.flink.streaming.api.StreamConfig.setUserInvokable(StreamConfig.java:173)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.setVertexConfig(StreamingJobGraphGenerator.java:213)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:129)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:121)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:116)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:121)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.setChaining(StreamingJobGraphGenerator.java:95)
> at
> org.apache.flink.streaming.api.StreamingJobGraphGenerator.createJobGraph(StreamingJobGraphGenerator.java:86)
> at
> org.apache.flink.streaming.api.StreamGraph.getJobGraph(StreamGraph.java:510)
> at
> org.apache.flink.streaming.util.TestStreamEnvironment.execute(TestStreamEnvironment.java:59)
> at
> org.apache.flink.streaming.util.TestStreamEnvironment.execute(TestStreamEnvironment.java:54)
> at
> org.apache.flink.streaming.api.ComplexIntegrationTest.complexIntegrationTest7(ComplexIntegrationTest.java:433)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
> Caused by: org.apache.commons.lang3.SerializationException:
> java.io.NotSerializableException:
> org.apache.flink.streaming.api.ComplexIntegrationTest
> at
> org.apache.commons.lang3.SerializationUtils.serialize(SerializationUtils.java:157)
> at
> org.apache.commons.lang3.SerializationUtils.serialize(SerializationUtils.java:179)
> at
> org.apache.flink.streaming.api.StreamConfig.setUserInvokable(StreamConfig.java:171)
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