Hi: My drools rules application is deployed in JBoss, and my classpath includes these jars: activation.jar help.jar jcs-1.2.5-dev.jar mail.jar AdventNetLogging.jar hsqldb.jar jcs.jar mail-plugin.jar AdventNetSnmp.jar hsqldb-plugin.jar JDHCP.jar montnets.jar antlr-2.7.5.jar janino-2.3.15.jar jdom.jar msbase.jar antlr-3.0b6.jar jaxp-api.jar jfc_094.jar mssqlserver.jar asm-1.5.3.jar jbcl.jar jfc_common.jar msutil.jar autonumber-plugin.jar jbossall-client.jar jgroups.jar mysql-connector-java-3.1.12-bin.jar bcel.jar jboss-common-jdbc-wrapper.jar jh.jar NetComponents.jar bindingservice-plugin.jar jbossha.jar jmx-adaptor-plugin.jar org.eclipse.jdt.core_3.2.0.v_642.jar bsh-core-1.3.0.jar jboss-j2ee.jar jmxri.jar properties-plugin.jar bsh-deployer.jar jboss-jaas.jar jnet.jar sax.jar commons-collections-3.1.jar jboss.jar jnp.jar scheduler-plugin-example.jar commons-lang-1.0.1.jar jboss-jdbc_ext.jar jnpserver.jar scheduler-plugin.jar concurrent.jar jboss-jsr77.jar jpl-pattern.jar smproxy.jar dnsjava-1.3.0.jar jboss-management.jar jpl-util.jar snmp-support.jar dom.jar jboss-monitoring.jar jsr94-1.1.jar stringtemplate-3.0.jar drools-compiler-3.1.0-M1.jar jbossmq.jar jsr94-tck-1.1.jar xalan.jar drools-core-3.1.0-M1.jar jbosssx.jar jsse.jar xercesImpl.jar drools-decisiontables-3.1.0-M1.jar jboss-transaction.jar jython-20020827-no-oro.jar xsltc.jar dx.jar jcert.jar libmondem.so groovy-all-1.0-jsr-04.jar jconn2.jar log4j.jar and my project is building in eclipse 3.2M5, and JBoss version 3.2.5 when JBoss runs, the following Exception occurs: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem; 22:17:19,159 INFO [STDOUT] at org.apache.commons.jci.compilers.EclipseJavaCompiler$2.acceptResult(EclipseJavaCompiler.java:247) 22:17:19,159 INFO [STDOUT] at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:454) 22:17:19,160 INFO [STDOUT] at org.apache.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:278) 22:17:19,160 INFO [STDOUT] at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:501) 22:17:19,160 INFO [STDOUT] at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:224) 22:17:19,161 INFO [STDOUT] at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:148) 22:17:19,161 INFO [STDOUT] at com.dcampus.snms.event.mbean.RuleManage.readRules(Unknown Source) 22:17:19,162 INFO [STDOUT] at com.dcampus.snms.event.mbean.RuleManage.initRuleBaseEngine(Unknown Source) 22:17:19,162 INFO [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 22:17:19,162 INFO [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 22:17:19,163 INFO [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 22:17:19,163 INFO [STDOUT] at java.lang.reflect.Method.invoke(Method.java:585) 22:17:19,164 INFO [STDOUT] at org.jboss.mx.server.ReflectedDispatcher.dispatch(ReflectedDispatcher.java:60) 22:17:19,164 INFO [STDOUT] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:61) 22:17:19,164 INFO [STDOUT] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:53) 22:17:19,165 INFO [STDOUT] at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) 22:17:19,165 INFO [STDOUT] at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:185) 22:17:19,166 INFO [STDOUT] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:473) 22:17:19,166 INFO [STDOUT] at org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:234) 22:17:19,166 INFO [STDOUT] at org.jboss.jmx.adaptor.control.Server.invokeOp(Server.java:200) 22:17:19,167 INFO [STDOUT] at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.invokeOp(HtmlAdaptorServlet.java:241) 22:17:19,167 INFO [STDOUT] at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:79) 22:17:19,168 INFO [STDOUT] at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doPost(HtmlAdaptorServlet.java:61) 22:17:19,168 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 22:17:19,169 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) 22:17:19,169 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) 22:17:19,170 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) 22:17:19,170 INFO [STDOUT] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) 22:17:19,170 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 22:17:19,171 INFO [STDOUT] at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 22:17:19,171 INFO [STDOUT] at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) 22:17:19,172 INFO [STDOUT] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) 22:17:19,172 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 22:17:19,172 INFO [STDOUT] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:72) 22:17:19,173 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) 22:17:19,173 INFO [STDOUT] at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrRealm.java:275) 22:17:19,174 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) 22:17:19,174 INFO [STDOUT] at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 22:17:19,174 INFO [STDOUT] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) 22:17:19,175 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 22:17:19,175 INFO [STDOUT] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) 22:17:19,176 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) 22:17:19,176 INFO [STDOUT] at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 22:17:19,176 INFO [STDOUT] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 22:17:19,177 INFO [STDOUT] at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) 22:17:19,177 INFO [STDOUT] at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) 22:17:19,178 INFO [STDOUT] at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) 22:17:19,178 INFO [STDOUT] at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) 22:17:19,179 INFO [STDOUT] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) 22:17:19,179 INFO [STDOUT] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) 22:17:19,180 INFO [STDOUT] at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) 22:17:19,180 INFO [STDOUT] at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) 22:17:19,181 INFO [STDOUT] at java.lang.Thread.run(Thread.java:595) and I get some solution from the website: http://wiki.jboss.org/wiki/Wiki.jsp?page=RulesTomcat, so i add the following code in my application: PackageBuilderConfiguration pkgBuilderCfg = new PackageBuilderConfiguration(); pkgBuilderCfg.setCompiler(PackageBuilderConfiguration.JANINO); but after done, the same Exception occurs. please help me, urgently. Best regards -- ------------------------------------------------------------ He Jianfei(何剑飞) South China University of Technology Communication & Computer Network key Laboratory of Guangdong Guangzhou, P.R.China,510640 Email: jfhe(a)scut.edu.cn jianfei.he(a)gmail.com Tel: (86)13570352756 -----------------------------------------------------------