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

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco closed DROOLS-944.
------------------------------
    Fix Version/s: 6.4.x
       Resolution: Done


Fixed by https://github.com/droolsjbpm/drools/commit/f0b787326

> 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: 6.2.0.Final, 6.3.0.Final
>         Environment: Java 8, Maven 3 (required to run the attached reproducer)
>            Reporter: René Zanner
>            Assignee: Mario Fusco
>            Priority: Blocker
>             Fix For: 6.4.x
>
>         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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