Cliff Resnick created FLINK-8616:
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Summary: Missing null check in OperatorChain#pushToOperator masks
ClassCastException
Key: FLINK-8616
URL: https://issues.apache.org/jira/browse/FLINK-8616
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.4.0
Reporter: Cliff Resnick
There is an attempt to enrich the exception with outputTag#getId, but outputTag
is null, and a NullPointerException is thrown. Looking at the attempted message
enrichment the code seems to assume a ClassCastException can only stem from
SideOutput type mismatches. This may have been the norm before, but changes to
classloader delegation in 1.4 have given rise to multiple ClassLoader conflicts
(at least for us), and they all seem to end up here.
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