Details
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Bug
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Resolution: Done
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Blocker
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6.2.0.Final, 6.3.0.Final
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None
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NEW
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NEW
Description
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:
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)
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 
...
