Github user melentye commented on the issue:
https://github.com/apache/flink/pull/2804
@StephanEwen it seems that the semantics is different when java.version is
just defined in pom.xml versus being overriden with -Djava.version=x.y.z
argument passed to mvn.
org.apache.hadoop.hbase.util.ClassSize expects a very specific format of
java.version system property. But when java.version is only defined in pom.xml
then it doesn't actually become a system property unlike in case of using
-Djava.version
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