Folks, I'm working through the BRMS insurance example (the very last section in the Drools documentation). I can build ( the example) and deploy both it and the BRMS ok. I import the repository , rebuild the snapshot binaries (BRMS), then hit the 'Continue' button on the drools insurance I get the InvalidClassException (below). I remember testing this for Edson and Ferando a couple of months back, so it could be something stupid that I'm doing. I'm running JBoss 4.2.1 , Java 1.6.0_03 on Windows Vista. I'm currently using BRMS 4.0.4 , with the insurance example from the Trunk (4.1.0 Snapshot), Other things I've tried: 1) All combinations of latest stable 4.0.4 and Trunk (including the obvious 4.0.4 for both, and the snapshot for both) 2) I've extracted the fact classes from the insurance war, made a standalone jar, and imported these into the BRMS 3) I've check the URL that the Insurance example uses, and modified it to take ' /LATEST'. Michael (thanks for the earlier suggestion) : Is this (number 2) what you meant by updating the Jars? Any other suggestions that I can try? Thanks Paul 07:18:44,174 ERROR [STDERR] java.io.InvalidClassException: org.drools.base.BaseEvaluator; local class incompatible: stre am classdesc serialVersionUID = -8775766726376324603, local class serialVersionUID = 6904653022187134940 07:18:44,174 ERROR [STDERR] at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,190 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) 07:18:44,205 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) 07:18:44,205 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,205 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,205 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) 07:18:44,221 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) 07:18:44,221 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,221 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,221 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 07:18:44,221 ERROR [STDERR] at java.util.ArrayList.readObject(ArrayList.java:593) 07:18:44,221 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 07:18:44,221 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 07:18:44,236 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 07:18:44,236 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597) 07:18:44,236 ERROR [STDERR] at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) 07:18:44,236 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1846) 07:18:44,236 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,252 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) 07:18:44,268 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) 07:18:44,268 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,268 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,283 ERROR [STDERR] at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667) 07:18:44,283 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323) 07:18:44,283 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) 07:18:44,283 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) 07:18:44,283 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,299 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,299 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 07:18:44,299 ERROR [STDERR] at java.util.HashMap.readObject(HashMap.java:1030) 07:18:44,299 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 07:18:44,299 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 07:18:44,299 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 07:18:44,314 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597) 07:18:44,314 ERROR [STDERR] at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) 07:18:44,314 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1846) 07:18:44,314 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 07:18:44,330 ERROR [STDERR] at org.drools.rule.PackageCompilationData.readExternal(PackageCompilationData.java:152) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,330 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 07:18:44,346 ERROR [STDERR] at org.drools.rule.Package.readExternal(Package.java:175) 07:18:44,346 ERROR [STDERR] at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) 07:18:44,346 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751) 07:18:44,346 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) 07:18:44,346 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 07:18:44,361 ERROR [STDERR] at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:54) 07:18:44,361 ERROR [STDERR] at org.drools.agent.URLScanner.readPackage(URLScanner.java:137) 07:18:44,361 ERROR [STDERR] at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:109) 07:18:44,361 ERROR [STDERR] at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:88) 07:18:44,361 ERROR [STDERR] at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:330) 07:18:44,361 ERROR [STDERR] at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:298) 07:18:44,377 ERROR [STDERR] at org.drools.agent.RuleAgent.configure(RuleAgent.java:284) 07:18:44,377 ERROR [STDERR] at org.drools.agent.RuleAgent.init(RuleAgent.java:208) 07:18:44,377 ERROR [STDERR] at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:176) 07:18:44,377 ERROR [STDERR] at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:148) 07:18:44,377 ERROR [STDERR] at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:216) 07:18:44,377 ERROR [STDERR] at org.acme.insurance.web.InsuranceSessionHelper.loadRuleBaseFromRuleAgent(InsuranceSess ionHelper.java:26) 07:18:44,392 ERROR [STDERR] at org.acme.insurance.web.InsuranceSessionHelper.getSession(InsuranceSessionHelper.java: 17) 07:18:44,392 ERROR [STDERR] at org.acme.insurance.web.DroolsBusiness.execute(DroolsBusiness.java:46) 07:18:44,392 ERROR [STDERR] at org.acme.insurance.web.InsuranceServlet.doGet(InsuranceServlet.java:24) 07:18:44,392 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 07:18:44,392 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 07:18:44,392 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterCha in.java:290) 07:18:44,408 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java: 206) 07:18:44,408 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 07:18:44,408 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterCha in.java:235) 07:18:44,424 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java: 206) 07:18:44,424 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 07:18:44,424 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 07:18:44,424 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValv e.java:179) 07:18:44,424 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 07:18:44,439 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 07:18:44,455 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 07:18:44,455 ERROR [STDERR] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.j ava:157) 07:18:44,455 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 07:18:44,455 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) 07:18:44,455 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 07:18:44,470 ERROR [STDERR] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protoco l.java:580) 07:18:44,470 ERROR [STDERR] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 07:18:44,470 ERROR [STDERR] at java.lang.Thread.run(Thread.java:619) 07:18:44,658 ERROR [STDERR] java.lang.IllegalArgumentException: Unknown process ID: insuranceProcess 07:18:44,658 ERROR [STDERR] at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1571) 07:18:44,673 ERROR [STDERR] at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1565) 07:18:44,673 ERROR [STDERR] at org.acme.insurance.web.InsuranceSessionHelper.getSession(InsuranceSessionHelper.java: 21) 07:18:44,673 ERROR [STDERR] at org.acme.insurance.web.DroolsBusiness.execute(DroolsBusiness.java:46) 07:18:44,673 ERROR [STDERR] at org.acme.insurance.web.InsuranceServlet.doGet(InsuranceServlet.java:24) 07:18:44,689 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 07:18:44,689 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 07:18:44,689 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterCha in.java:290) 07:18:44,689 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java: 206) 07:18:44,689 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 07:18:44,689 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterCha in.java:235) 07:18:44,704 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java: 206) 07:18:44,704 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 07:18:44,704 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 07:18:44,704 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValv e.java:179) 07:18:44,720 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 07:18:44,720 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 07:18:44,720 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 07:18:44,720 ERROR [STDERR] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.j ava:157) 07:18:44,720 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 07:18:44,736 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) 07:18:44,736 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 07:18:44,736 ERROR [STDERR] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protoco l.java:580) 07:18:44,736 ERROR [STDERR] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 07:18:44,736 ERROR [STDERR] at java.lang.Thread.run(Thread.java:619) 07:19:14,516 INFO [STDOUT] ERROR 18-01 07:19:14,516 (Contexts.java:flushAndDestroyContexts:335) could not discover transaction status