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that it does not get outdated again.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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