[rules-users] Out of Memory Issue of JBoss Engine deployed on IBM WAS 6.0.2.7

[Edson Tirelli]

Did you tried latest JBoss Rules version, just in case? 3.0.5. I don't 
think it will solve this problem, but it is good to use the latest 
version as it brings other fixes.

This is lexer code generated by Antlr, so probably an Antlr bug. To 
diagnose we will probably need the full log/stacktrace for the out of 
memory, plus some sample of the rulebase you are using.. we need to 
identify which construction is causing the automato to break.

[]s
Edson




Dejia Wang wrote:

> Hi All,
>
> I ran into OOM (Out of Memory) issue of JBoss Engine deployed on IBM 
> WAS 6.0.2.7. Below is the log
>
> …
>
> [Loaded org.antlr.runtime.DFA from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/xxx.ear/lib/antlr-3.0ea8.jar]
>
> [Loading superclass and interfaces of org/antlr/runtime/DFA]
>
> [Preparing org/antlr/runtime/DFA]
>
> [Loaded org.antlr.runtime.DFA$State from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/xxxApplications.ear/lib/antlr-3.0ea8.jar]
>
> [Loading superclass and interfaces of org/antlr/runtime/DFA$State]
>
> [Loaded org.drools.lang.RuleParserLexer$1 from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/xxxApplications.ear/lib/drools-compiler-3.0.jar]
>
> [Loading superclass and interfaces of org/drools/lang/RuleParserLexer$1]
>
> [Loaded org.drools.lang.RuleParserLexer$2 from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/ 
> xxxApplications.ear/lib/drools-compiler-3.0.jar]
>
> [Loading superclass and interfaces of org/drools/lang/RuleParserLexer$2]
>
> [Loaded org.drools.lang.RuleParserLexer$3 from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/ 
> xxxApplications.ear/lib/drools-compiler-3.0.jar]
>
> [Loading superclass and interfaces of org/drools/lang/RuleParserLexer$3]
>
> [Loaded org.drools.lang.RuleParserLexer$4 from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/ 
> xxxApplications.ear/lib/drools-compiler-3.0.jar]
>
> [Loading superclass and interfaces of org/drools/lang/RuleParserLexer$4]
>
> ….
>
> [Loaded org.drools.lang.RuleParserLexer$228 from 
> file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Cell/xxxApplications.ear/lib/drools-compiler-3.0.jar]
>
> [Loading superclass and interfaces of org/drools/lang/RuleParserLexer$228]
>
> …
>
> It looks like it loaded the same class hundreds of times until it 
> exhausts the memory.
>
> Any idea why this happens and how to fix this?
>
> Thanks- Dejia
>
>------------------------------------------------------------------------
>
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-- 
 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
 Office: +55 11 3124-6000
 Mobile: +55 11 9218-4151
 JBoss, a division of Red Hat @ www.jboss.com