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@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@gmail.com>
To: rules-users@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@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@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
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Email adarsh.chaini@hsbcib.com



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************************************************************
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. 

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