Github user mbalassi commented on the pull request: https://github.com/apache/flink/pull/520#issuecomment-98628873 Hey, Sorry for not attending to this for a long time. It needed a rebase for the API of the chaining. Now that I have updated that the test throws the following NPE: Caused by: java.lang.NullPointerException at org.apache.flink.streaming.api.complex.ComplexIntegrationTest$MyTimestamp.getTimestamp(ComplexIntegrationTest.java:659) at org.apache.flink.streaming.api.complex.ComplexIntegrationTest$MyTimestamp.getTimestamp(ComplexIntegrationTest.java:654) at org.apache.flink.streaming.api.windowing.helper.TimestampWrapper.getTimestamp(TimestampWrapper.java:34) at org.apache.flink.streaming.api.windowing.windowbuffer.SlidingTimePreReducer.afterEmit(SlidingTimePreReducer.java:71) at org.apache.flink.streaming.api.windowing.windowbuffer.SlidingPreReducer.emitWindow(SlidingPreReducer.java:59) ... 7 more It would be nice if we could separate the individual tests, so it is easier to track an exception like that. Maybe a solution similar to `MiltipleProgramsTestBase` for streaming would do the trick. @szape, could you please do an update with these, then I'd merge it asap so that it does not get outdated again. Thanks.
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