We have found that some
of the drools classes are not thread safe and hence causing the whole KB
serialisation and deserialisation issues in a highly
concurrent distributed cluster.
The below is an example of one of the
instances we have come across where the usage of a non
thread safe collection as instance variables has caused the issue.
Could someone look into this and advise:
1) If this has been reported /identified
and logged somewhere as an issue already
2)If there has been any
fix to problems like this in later versions of 5.3.0.Final
?. 3)If not fixed already what is
the process to initiate a fix.
Caused by: java.io.InvalidObjectException:
Illegal mappings count: -1
at
java.util.HashMap.readObject(HashMap.java:1130) at
sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
java.lang.reflect.Method.invoke(Method.java:601)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.jbpm.workflow.core.DroolsAction.readExternal(DroolsAction.java:61) at
org.jbpm.workflow.core.impl.DroolsConsequenceAction.readExternal(DroolsConsequenceAction.java:49)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1835)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1794)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.drools.rule.JavaDialectRuntimeData.readExternal(JavaDialectRuntimeData.java:182)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1835)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1794)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
java.util.HashMap.readObject(HashMap.java:1155)
at
sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
java.lang.reflect.Method.invoke(Method.java:601)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:59)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1835)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1794)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.drools.rule.Package.readExternal(Package.java:197)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1835)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1794)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
java.util.HashMap.readObject(HashMap.java:1155)
at
sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
java.lang.reflect.Method.invoke(Method.java:601)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
org.drools.common.AbstractRuleBase.readExternal(AbstractRuleBase.java:270)
at
org.drools.reteoo.ReteooRuleBase.readExternal(ReteooRuleBase.java:223)
at
org.drools.impl.KnowledgeBaseImpl.readExternal(KnowledgeBaseImpl.java:116)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1835)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1794)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at
com.hsbc.gbm.dsl.domain.DSLRuleSet$Serializer.createInstance(DSLRuleSet.java:328)
at
com.hsbc.gbm.dsl.domain.DSLRuleSet$Serializer.createInstance(DSLRuleSet.java:1)
at
com.hsbc.gbm.dsl.domain.AbstractSerializer.deserialize(AbstractSerializer.java:144)
Thanks and regards,
Adarsh CHAINI SENIOR LEAD DEVELOPMENT SPECIALIST | HSBC
Bank Plc
8 Canada Square, London E14 5HQ, UK
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