[jboss-jira] [JBoss JIRA] (DROOLS-944) KieBase deserialization throws NullPointerException

[René Zanner (JIRA)]

René Zanner created DROOLS-944:
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             Summary: KieBase deserialization throws NullPointerException
                 Key: DROOLS-944
                 URL: https://issues.jboss.org/browse/DROOLS-944
             Project: Drools
          Issue Type: Bug
          Components: core engine
    Affects Versions: 6.3.0.Final, 6.2.0.Final
         Environment: Java 8, Maven 3 (required to run the attached reproducer)
            Reporter: René Zanner
            Assignee: Mario Fusco
            Priority: Blocker
         Attachments: reproducer.zip

When deserializing a serialized KieBase, sometimes a NullPointerException occurs. 

It seems to be related to specific patterns in the DRL file (esp. in MVEL expressions). The attached reproducer (Maven 3 project requiring Java 8) contains a sample DRL file with the suspicious content. When calling "mvn install", the build fails with the following stacktrace:{code}java.lang.NullPointerException: null
        at org.drools.core.base.BaseClassFieldReader.equals(BaseClassFieldReader.java:107)
        at org.drools.core.base.extractors.MVELObjectClassFieldReader.equals(MVELObjectClassFieldReader.java:165)
        at java.util.HashMap.putVal(HashMap.java:634)
        at java.util.HashMap.put(HashMap.java:611)
        at java.util.HashSet.readObject(HashSet.java:334)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at org.drools.core.rule.MVELDialectRuntimeData.readExternal(MVELDialectRuntimeData.java:101)
        at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1840)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1799)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at java.util.HashMap.readObject(HashMap.java:1396)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at org.drools.core.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:59)
        at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1840)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1799)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at org.drools.core.definitions.impl.KnowledgePackageImpl.readExternal(KnowledgePackageImpl.java:292)
        at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1840)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1799)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at java.util.HashMap.readObject(HashMap.java:1396)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at org.drools.core.impl.KnowledgeBaseImpl.readExternal(KnowledgeBaseImpl.java:459)
        at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1840)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1799)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at test.ReproducerTest.deserialize(ReproducerTest.java:52)
        at test.ReproducerTest.runAsJUnitTest(ReproducerTest.java:25){code}
When changing the suspicious pattern to something different, the test runs fine.

Since there is no work-around for us, we request for assistance on this one from some specialist in MVEL and/or Drools :-)...



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