It was my understanding that even if you set the dialect to java that mvel is still used to execute some LHS expressions. (Except for code inside an accumulate expression.) It's the RHS that is mainly affected. --- On *Fri, 6/25/10, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt;* wrote: From: Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; Subject: [rules-users] Minimum jar set in 5.1.0.M2 contains lib/mvel2.jar - a show stopper for us To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Friday, June 25, 2010, 3:05 AM I've read somewhere that the minimum jar set for execution with a precompiled .pkg is just drools-api-5.1.0.M2.jar drools-core-5.1.0.M2.jar However, trying to run an application with just a .pkg file, this jar set results in the stack dump shown below, due to a missing "org.mvel2..." class. Adding lib/mvel2-2.0.16.jar to the CLASSPATH fixes this, but (for reasons I don't care to elaborate here) be we can't have this in our application. Can this .jar be avoided? Note: I'm not using mvel, and the .drl file begins with "package movie; dialect "java". -W Exception in thread "main" java.lang.NoClassDefFoundError: org/mvel2/integration/impl/MapVariableResolverFactory at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:632) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) at java.net.URLClassLoader.access$000(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:212) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:319) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:264) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields(Class.java:2308) at java.lang.Class.getDeclaredField(Class.java:1897) at java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1627) at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:69) at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:442) at java.security.AccessController.doPrivileged(Native Method) at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:430) at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:327) at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:564) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368) at java.util.HashMap.readObject(HashMap.java:1047) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1865) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368) at org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:41) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1809) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1768) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368) at org.drools.rule.Package.readExternal(Package.java:198) at org.drools.definitions.impl.KnowledgePackageImp.readExternal(KnowledgePackageImp.java:99) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1809) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1768) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368) at java.util.ArrayList.readObject(ArrayList.java:696) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1865) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368) at movie.Main.init(Main.java:40) at movie.Main.main(Main.java:89) Caused by: java.lang.ClassNotFoundException: org.mvel2.integration.impl.MapVariableResolverFactory at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:319) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:264) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) ... 60 more -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list 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