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(a)hsbcib.com wrote:

Adarsh, CR1 is "candidate release 1" and is available from the JBoss Maven Repositories. 5.6.0.Final will probably be released this week. There are quite a few internal differences between 5.3 and 5.6, but as far as I know the APIs have remained the same, so it should be possible to switch almost effortlessly. Others may be able to comment on their upgrade experience. Ruleflows, however, have been informally deprecated in favor of proper bpmn business processes for a while, so not much was added there, but they should still be supported in 5.6. Also remember that even 5.6, while a bit more robust from that perspective, is not guaranteed to be 100% thread safe. Davide On 12/17/2013 07:00 AM, adarsh.chaini(a)hsbcib.com wrote:

Also remember that even 5.6, while a bit more robust from that perspective, is not guaranteed to be 100% thread safe. Is there a document that details this robustness and what has changed ?. Ruleflows, however, have been informally deprecated in favor of proper bpmn business processes for a while, so not much was added there, but they should still be supported in 5.6. On above , what is the time line from deprecation to complete removal in future versions?. How easy it is to migrate from the rule flow to the jbpmn? .Is there a quick migration procedure/tool. 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(a)hsbcib.com _______________________________________________ Protect our environment - please only print this if you have to! From: Davide Sottara <dsotty(a)gmail.com&gt; To: Rules Users List <rules-users(a)lists.jboss.org&gt; Date: 18/12/2013 07:42 Subject: Re: [rules-users] Drools KB Object hierarchy Serilisation and Deserialisation thread safety issue Sent by: rules-users-bounces(a)lists.jboss.org Adarsh, CR1 is "candidate release 1" and is available from the JBoss Maven Repositories. 5.6.0.Final will probably be released this week. There are quite a few internal differences between 5.3 and 5.6, but as far as I know the APIs have remained the same, so it should be possible to switch almost effortlessly. Others may be able to comment on their upgrade experience. Ruleflows, however, have been informally deprecated in favor of proper bpmn business processes for a while, so not much was added there, but they should still be supported in 5.6. Also remember that even 5.6, while a bit more robust from that perspective, is not guaranteed to be 100% thread safe. Davide On 12/17/2013 07:00 AM, adarsh.chaini(a)hsbcib.com wrote: Davide, Thanks for your reply on this.What does CR1 stands for in 5.6.0.CR1 and can someone point me to the release life cycle timelines?. Also the important aspect is are 5.6.0.CR1 and 5.5.0.Final versions backward compatible to 5.3.0.Final and fully regressed ? Is there any documentation that describes the major changes like this .We are mostly using the rule engine with the rule flow aspects of the product Thanks and regards, Adarsh CHAINI From: Davide Sottara <dsotty(a)gmail.com&gt; To: rules-users(a)lists.jboss.org Date: 14/12/2013 19:56 Subject: Re: [rules-users] Drools KB Object hierarchy Serilisation and Deserialisation thread safety issue Sent by: rules-users-bounces(a)lists.jboss.org 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(a)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(a)hsbcib.com _______________________________________________ Protect our environment - please only print this if you have to! ************************************************************ HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest. HSBC Bank plc Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom Registered in England - Number 14259 Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority ************************************************************ ----------------------------------------- SAVE PAPER - THINK BEFORE YOU PRINT! This transmission has been issued by a member of the HSBC Group "HSBC" for the information of the addressee only and should not be reproduced and/or distributed to any other person. Each page attached hereto must be read in conjunction with any disclaimer which forms part of it. Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. Its contents are based on information obtained from sources believed to be reliable but HSBC makes no representation and accepts no responsibility or liability as to its completeness or accuracy. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ************************************************************ HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest. HSBC Bank plc Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom Registered in England - Number 14259 Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority ************************************************************ ----------------------------------------- SAVE PAPER - THINK BEFORE YOU PRINT! This transmission has been issued by a member of the HSBC Group "HSBC" for the information of the addressee only and should not be reproduced and/or distributed to any other person. Each page attached hereto must be read in conjunction with any disclaimer which forms part of it. Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. Its contents are based on information obtained from sources believed to be reliable but HSBC makes no representation and accepts no responsibility or liability as to its completeness or accuracy. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ************************************************************ HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest. HSBC Bank plc Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom Registered in England - Number 14259 Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority ************************************************************ ************************************************************ HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest. HSBC Bank plc Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom Registered in England - Number 14259 Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority ************************************************************ ************************************************************ HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest. HSBC Bank plc Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom Registered in England - Number 14259 Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority ************************************************************