steveniemitz commented on pull request #13802:
URL: https://github.com/apache/beam/pull/13802#issuecomment-766185749
I tried using SetState, but get this:
```
java.lang.NullPointerException
at
org.apache.beam.runners.dataflow.worker.WindmillStateInternals$WindmillMap.getFuture(WindmillStateInternals.java:1533)
at
org.apache.beam.runners.dataflow.worker.WindmillStateInternals$WindmillMap.access$2000(WindmillStateInternals.java:1175)
at
org.apache.beam.runners.dataflow.worker.WindmillStateInternals$WindmillMap$4.readLater(WindmillStateInternals.java:1425)
at
org.apache.beam.runners.dataflow.worker.WindmillStateInternals$WindmillMap$2.readLater(WindmillStateInternals.java:1339)
at
org.apache.beam.runners.dataflow.worker.WindmillStateInternals$WindmillSet.readLater(WindmillStateInternals.java:1165)
```
It looks like WindmillSet is missing an override on initializeForWorkItem to
initialize the underlying windmillMap.
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