hi, I am a new drools user. I setup the guvnor standalone install from the drools website. Problem occurs when i upload a .jar file while i created using eclipse. It shows that the jar file has uploaded successfully but I am unable to 'save & validate' I get error: "contact system administrator" When I do 'Build Package' I get error: Pojos have loaded .class files using java version 1.6 and guvnor is using java version 1.5 I am not understanding how I could change the java version used. Does it have anything to do with my eclipse? I set my project settings (when I create a new java project) as J2SE1.5 and JRE6. Is that the issue??? Please help. The stack trace I get is: 11:39:44,904 ERROR [STDERR] com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract org.drools.guvnor.client.modeldriven.SuggestionCompletionEngine org.drools.guvnor.client.rpc.RepositoryService.loadSuggestionCompletionEngine(java.lang.String) throws com.google.gwt.user.client.rpc.SerializableException' threw an unexpected exception: java.lang.reflect.InvocationTargetException 11:39:44,904 ERROR [STDERR] at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360) 11:39:44,904 ERROR [STDERR] at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546) 11:39:44,904 ERROR [STDERR] at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164) 11:39:44,904 ERROR [STDERR] at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) 11:39:44,904 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) 11:39:44,904 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 11:39:44,904 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 11:39:44,904 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 11:39:44,904 ERROR [STDERR] at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42) 11:39:44,905 ERROR [STDERR] at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:53) 11:39:44,905 ERROR [STDERR] at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) 11:39:44,905 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 11:39:44,905 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 11:39:44,905 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 11:39:44,905 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 11:39:44,905 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 11:39:44,905 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 11:39:44,906 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 11:39:44,906 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182) 11:39:44,906 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 11:39:44,906 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 11:39:44,906 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 11:39:44,906 ERROR [STDERR] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 11:39:44,906 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 11:39:44,906 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) 11:39:44,907 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 11:39:44,907 ERROR [STDERR] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 11:39:44,907 ERROR [STDERR] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) 11:39:44,907 ERROR [STDERR] at java.lang.Thread.run(Thread.java:613) 11:39:44,907 ERROR [STDERR] Caused by: java.lang.reflect.InvocationTargetException 11:39:44,907 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 11:39:44,907 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 11:39:44,907 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 11:39:44,907 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585) 11:39:44,907 ERROR [STDERR] at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) 11:39:44,907 ERROR [STDERR] at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31) 11:39:44,907 ERROR [STDERR] at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) 11:39:44,909 ERROR [STDERR] at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) 11:39:44,909 ERROR [STDERR] at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) 11:39:44,909 ERROR [STDERR] at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77) 11:39:44,909 ERROR [STDERR] at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) 11:39:44,909 ERROR [STDERR] at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:157) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166) 11:39:44,910 ERROR [STDERR] at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102) 11:39:44,910 ERROR [STDERR] at org.drools.guvnor.server.ServiceImplementation_$$_javassist_7.loadSuggestionCompletionEngine(ServiceImplementation_$$_javassist_7.java) 11:39:44,911 ERROR [STDERR] at org.drools.guvnor.server.RepositoryServiceServlet.loadSuggestionCompletionEngine(RepositoryServiceServlet.java:193) 11:39:44,911 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 11:39:44,911 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 11:39:44,911 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 11:39:44,911 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585) 11:39:44,911 ERROR [STDERR] at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527) 11:39:44,911 ERROR [STDERR] ... 27 more 11:39:44,912 ERROR [STDERR] Caused by: java.lang.ClassFormatError: Incompatible magic value 175137123 in class file com/rb/model/Contact 11:39:44,912 ERROR [STDERR] at java.lang.ClassLoader.defineClass1(Native Method) 11:39:44,912 ERROR [STDERR] at java.lang.ClassLoader.defineClass(ClassLoader.java:675) 11:39:44,912 ERROR [STDERR] at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:70) 11:39:44,912 ERROR [STDERR] at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:89) 11:39:44,912 ERROR [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:251) 11:39:44,912 ERROR [STDERR] at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374) 11:39:44,912 ERROR [STDERR] at java.lang.Class.forName0(Native Method) 11:39:44,913 ERROR [STDERR] at java.lang.Class.forName(Class.java:242) 11:39:44,913 ERROR [STDERR] at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:94) 11:39:44,913 ERROR [STDERR] at java.lang.ClassLoader.loadClass(ClassLoader.java:251) 11:39:44,913 ERROR [STDERR] at org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:144) 11:39:44,913 ERROR [STDERR] at org.drools.guvnor.server.rules.SuggestionCompletionLoader.loadClass(SuggestionCompletionLoader.java:387) 11:39:44,913 ERROR [STDERR] at org.drools.guvnor.server.rules.SuggestionCompletionLoader.populateModelInfo(SuggestionCompletionLoader.java:289) 11:39:44,913 ERROR [STDERR] at org.drools.guvnor.server.rules.SuggestionCompletionLoader.processPackageHeader(SuggestionCompletionLoader.java:180) 11:39:44,913 ERROR [STDERR] at org.drools.guvnor.server.rules.SuggestionCompletionLoader.getSuggestionEngine(SuggestionCompletionLoader.java:130) 11:39:44,913 ERROR [STDERR] at org.drools.guvnor.server.util.BRMSSuggestionCompletionLoader.getSuggestionEngine(BRMSSuggestionCompletionLoader.java:52) 11:39:44,914 ERROR [STDERR] at org.drools.guvnor.server.ServiceImplementation.loadSuggestionCompletionEngine(ServiceImplementation.java:1361) 11:39:44,914 ERROR [STDERR] ... 52 more Please help me!! 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