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

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/xxxNode02Ce ll/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$State from file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Ce ll/xxxApplications.ear/lib/antlr-3.0ea8.jar] [Loading superclass and interfaces of org/antlr/runtime/DFA$State] [Loaded org.drools.lang.RuleParserLexer$1 from file:/D:/WebSphere/AppServer/profiles/AppSrv01/installedApps/xxxNode02Ce ll/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/xxxNode02Ce ll/ 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/xxxNode02Ce ll/ 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/xxxNode02Ce ll/ 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/xxxNode02Ce ll/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