[jboss-jira] [JBoss JIRA] (DROOLS-4565) MVELDialectRuntimeData is not thread safe

[Timo Gutjahr (Jira)]

Timo Gutjahr created DROOLS-4565:
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             Summary: MVELDialectRuntimeData is not thread safe
                 Key: DROOLS-4565
                 URL: https://issues.jboss.org/browse/DROOLS-4565
             Project: Drools
          Issue Type: Bug
          Components: core engine
    Affects Versions: 7.16.0.Final
         Environment: Java 11.0.2
Different OS
            Reporter: Timo Gutjahr
            Assignee: Mario Fusco
         Attachments: ForkJoinPool-1-worker-1.txt, NPE.txt

MVELDialectRuntimeData#mvelReaders is accessed concurrently but is not thread safe due to the usage of a HashSet. This may cause lost updates. (See  [^ForkJoinPool-1-worker-1.txt] )

If this happens and the kie base is serialized and deserialized it results in a NullPointerException at runtime. (See  [^NPE.txt] )

We observed that the entries in this Set (mvelReaders) are serialized and important for the deserialization step because they contain information about transient objects that have to be re-initialized after deserialization.
While losing this information due to concurrent access does not cause problems during compilation, serialization and deserialization of a kie base, they may cause NullPointerExceptions at runtime when transient fields remain uninitialized.





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