NullPointerException in BaseClassFieldReader.writeExternal() when a global method is used in LHS and serialize package ---------------------------------------------------------------------------------------------------------------------- Key: DROOLS-2517 URL: https://issues.jboss.org/browse/DROOLS-2517 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.7.0.Final Reporter: Toshiya Kobayashi Assignee: Mario Fusco Labels: support Under the conditions: * A rule uses a method of global variable in LHS. e.g. Person(myUtil.transform(name) == "John-san") * A package is serialized Serializing the package throws NullPointerException. {noformat} java.lang.NullPointerException: null at org.drools.core.base.BaseClassFieldReader.writeExternal(BaseClassFieldReader.java:196) at org.drools.core.base.extractors.MVELObjectClassFieldReader.writeExternal(MVELObjectClassFieldReader.java:72) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.drools.core.base.ClassFieldAccessorStore$FieldLookupEntry.writeExternal(ClassFieldAccessorStore.java:384) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at java.util.concurrent.ConcurrentHashMap.writeObject(ConcurrentHashMap.java:1413) at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.drools.core.base.ClassFieldAccessorStore.writeExternal(ClassFieldAccessorStore.java:61) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.drools.core.definitions.impl.KnowledgePackageImpl.writeExternal(KnowledgePackageImpl.java:250) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1459) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1430) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at java.util.ArrayList.writeObject(ArrayList.java:762) 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.invokeWriteObject(ObjectStreamClass.java:1028) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.drools.compiler.integrationtests.SerializedPackageMergeTest.testBuildAndSerializePackagesWithGlobalMethodInLHS(SerializedPackageMergeTest.java:244) {noformat}