Normally that means there is something wrong with your .jar, are you sure there are .class files in there and not .java? We don't compile .jars we only add them to the classpath. Mark Darko Ivancan wrote: Product: JBoss DRools Version: 4.0.3 JDK: 1.5.0_12 OS: Windows XP SP2 AS: JBoss 4.2.2GA Hi, Sorry haven't been on the list for a while, busy with a project, which keeps me now really busy. We have here an exception which does not seem to make any sense and we're a bit lost in the why and where this happens. Any help will be appreciated. Thanks, Darko IVANCAN ---------------------------------- Steps to reproduce: 1. Log in to jBRMS 2. Created Package as "com.xyz.abcservice.rules" 3. Imported two jars ("rulescore.jar"," sampleDomain.jar") into Model. 4. Created New Rule with the following content package com.xyz.abcservice.rules; import domain.Accommodation1; import java.util.List; import com.xyz.common.rules.api.GenericRuleViolation; global java.util.List errList; rule "Conflict Rule 1" when accommodation1:Accommodation1(name == "Car") accommodation2:Accommodation1(name == "Caravan") then errList.add(new GenericRuleViolation(accommodation1,"Invalid cabin combination.")); end 4. Validate it… ------------Output------------------ An error occurred executing the action. Details <!-- AppServer Exceptions moved below this exception for readability--!> Caused by: java.lang.ClassFormatError: Incompatible magic value 1885430635 in class file domain/Accommodation1 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:60) at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:79) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.drools.rule.PackageCompilationData$PackageClassLoader.loadClass(PackageCompilationData.java:358) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:146) at org.drools.rule.builder.dialect.mvel.MVELDialect.addImport(MVELDialect.java:254) at org.drools.compiler.DialectRegistry.addImport(DialectRegistry.java:98) at org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:377) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:264) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167) at org.drools.brms.server.contenthandler.DecisionTableXLSHandler.compile(DecisionTableXLSHandler.java:63) at org.drools.brms.server.builder.ContentPackageAssembler.buildAsset(ContentPackageAssembler.java:139) at org.drools.brms.server.builder.ContentPackageAssembler.<init>(ContentPackageAssembler.java:103) at org.drools.brms.server.ServiceImplementation.buildAsset(ServiceImplementation.java:867) ... 51 more <!-- AppServer Exceptions: --!> java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.seam.util.Reflections.invoke(Reflections.java:21) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:46) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:40) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:106) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:155) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:91) at org.drools.brms.server.ServiceImplementation_$$_javassist_3.buildAsset(ServiceImplementation_$$_javassist_3.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.seam.remoting.gwt.GWTToSeamAdapter.callWebRemoteMethod(GWTToSeamAdapter.java:74) at org.jboss.seam.remoting.gwt.GWTRemoteServiceServlet.processCall(GWTRemoteServiceServlet.java:290) at org.jboss.seam.remoting.gwt.GWTRemoteServiceServlet.doPost(GWTRemoteServiceServlet.java:172) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42) at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:46) at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) at java.lang.Thread.run(Thread.java:595) 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