As far as I know, older versions of Drools were not guaranteed to be thread-safe,
and the whole (de)serialization subsystem has been upgraded since 5.3.0.Final.
Could you try a later version such as 5.5.0.Final or 5.6.0.CR1?

Bugs and issues are usually reported using JIRA (community) or Bugzilla (product)
You can find more information on how to report/contribute here:
http://www.jboss.org/contribute
or in the drools documentation, chapter 1.2

Davide

On 12/13/2013 12:39 PM, adarsh.chaini@hsbcib.com wrote:

Hi,

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

_______________________________________________

Phone Int: (0)79914720 Ext: +44 (0)20 79914720

Mobile +44(0)7595530105

Email adarsh.chaini@hsbcib.com

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