Hi Don,

      I assume that it may be related to the cache based on
Collections.synchronizedMap, the implementation is refined via using
ConcurrentLinkedHashMap on parrot branch. Could you give it a try by
following the steps?

$ git clone -b parrot https://github.com/apache/groovy.git
$ cd groovy
$ gradlew -PuseAntlr4=true jarAllAll
( then you can find the "groovy-all-2.5.0-SNAPSHOT.jar" file under directory
target/libs )

     Good luck :)

Cheers,
Daniel.Sun



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