[rules-dev] Problems when using drools-server

Hi All, When I access the drools-server by URLConnection, I've always got such errors: WARNING: RuleAgent(default) EXCEPTION (Mon Feb 02 16:09:46 CST 2009): org.drools.base.BaseEvaluator; local class incompatible: stream classdesc serialVersionUID = -7767879457606879276, local class serialVersionUID = -7149415669283058142. Stack trace should follow. WARNING: java.io.InvalidClassException: org.drools.base.BaseEvaluator; local class incompatible: stream classdesc serialVersionUID = -7767879457606879276, local class serialVersionUID = -7149415669283058142 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.LiteralRestriction.readExternal(LiteralRestriction.java: 66) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.LiteralConstraint.readExternal(LiteralConstraint.java:67 ) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at java.util.ArrayList.readObject(ArrayList.java:593) at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.Pattern.readExternal(Pattern.java:115) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at java.util.ArrayList.readObject(ArrayList.java:593) at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.GroupElement.readExternal(GroupElement.java:57) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.Rule.readExternal(Rule.java:170) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at java.util.HashMap.readObject(HashMap.java:1029) at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.MVELDialectRuntimeData.readExternal(MVELDialectRuntimeDa ta.java:42) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at java.util.HashMap.readObject(HashMap.java:1030) at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegist ry.java:41) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.Package.readExternal(Package.java:197) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751 ) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:189) at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:158) at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:47) at org.drools.agent.URLScanner.readPackage(URLScanner.java:148) at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:120) at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:96) at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:410) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:362) at org.drools.agent.RuleAgent.configure(RuleAgent.java:347) at org.drools.agent.RuleAgent.init(RuleAgent.java:247) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256) at org.drools.server.KnowledgeStatelessServlet.getRuleBase(KnowledgeStatele ssServlet.java:109) at org.drools.server.KnowledgeStatelessServlet.doPost(KnowledgeStatelessSer vlet.java:71) at javax.servlet.http.HttpServlet.service(HttpServlet.java:738) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at org.apache.catalina.core.ApplicationFilterChain.servletService(Applicati onFilterChain.java:411) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:317) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:198) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFi lter.java:390) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:198) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:288) at WARNING: org.apache.catalina.core.StandardContextValve.invokeInternal(StandardCon textValve.java:271) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:202) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :206) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5 71) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:150) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5 71) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdap ter(DefaultProcessorTask.java:637) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess( DefaultProcessorTask.java:568) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(De faultProcessorTask.java:813) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcesso rTask(DefaultReadTask.java:341) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultR eadTask.java:263) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultR eadTask.java:214) at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(Po rtUnificationPipeline.java:380) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265) at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWork erThread.java:106) WARNING: java.lang.NullPointerException at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:363) at org.drools.agent.RuleAgent.configure(RuleAgent.java:347) at org.drools.agent.RuleAgent.init(RuleAgent.java:247) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256) at org.drools.server.KnowledgeStatelessServlet.getRuleBase(KnowledgeStatele ssServlet.java:109) at org.drools.server.KnowledgeStatelessServlet.doPost(KnowledgeStatelessSer vlet.java:71) at javax.servlet.http.HttpServlet.service(HttpServlet.java:738) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at org.apache.catalina.core.ApplicationFilterChain.servletService(Applicati onFilterChain.java:411) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:317) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:198) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFi lter.java:390) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:198) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:288) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardCon textValve.java:271) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:202) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :206) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5 71) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:150) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :632) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java :577) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:5 71) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdap ter(DefaultProcessorTask.java:637) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess( DefaultProcessorTask.java:568) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(De faultProcessorTask.java:813) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcesso rTask(DefaultReadTask.java:341) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultR eadTask.java:263) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultR eadTask.java:214) at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(Po rtUnificationPipeline.java:380) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265) at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWork erThread.java:106) Can anyone help me to fix this problem? I've got the same errors when trying to run KnowledgeServiceServletTest.java from the drool-server source code. Thanks, Jing