[rules-users] Drools KB Object hierarchy Serilisation and Deserialisation thread safety issue

Sat Dec 14 14:54:30 EST 2013

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 at 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 at hsbcib.com_ <mailto:adarsh.chaini at hsbcib.com>
>
>
>
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