[rules-users] Drools KB Object hierarchy Serilisation and Deserialisation thread safety issue
adarsh.chaini at hsbcib.com
adarsh.chaini at hsbcib.com
Fri Dec 13 14:39:55 EST 2013
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
_______________________________________________
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