2008/10/16 Edward Yakop <[EMAIL PROTECTED]> > Hi, > > I've been adding osgi integration test on core and I found a > classloading problem revolving around cglib enhancer. > The main problem is enhancer uses fragment class class loader to > create an enhanced class. If the fragment class > bundle does not import net.sf.cglib.proxy package, the enhancer will > throw a ClassDefNotFoundError exception. > > I googled this topic and found interesting discussion: > > http://groups.google.com/group/spring-osgi/browse_frm/thread/d921aaec07c3a5be/41b387ffde4c715b?lnk=gst&q=cglib&pli=1 > > I think Stuart's solution to subclass Enhancer and override > Enhancer#getClassLoader() would be the way to go. >
FYI, Enhancer also has a setClassLoader() method if you don't want to subclass. I've attached the class that sorts out code-generated classloading in Guice - note that this isn't exactly the same as the one in trunk, as I've added my patch for 235 (http://code.google.com/p/google-guice/issues/detail?id=235). HTH wdyt? > > Regards, > Edward Yakop > > Potential OSGi future direction: > http://www.osgi.org/blog/2007/07/to-declare-or-not-to-declare.html > > Sample exception: Note: I modified some qi4j core code (not > committed), hence it won't match line number of respective classes > Caused by: java.lang.RuntimeException: Fail to instantiate [class > org.qi4j.service.ServiceComposite$ServiceCompositeMixin] > at > org.qi4j.runtime.composite.ConstructorsModel.instantiationClass(ConstructorsModel.java:224) > at > org.qi4j.runtime.composite.ConstructorsModel.<init>(ConstructorsModel.java:51) > at org.qi4j.runtime.composite.MixinModel.<init>(MixinModel.java:54) > at > org.qi4j.runtime.composite.AbstractMixinsModel.implementMethodWithClass(AbstractMixinsModel.java:164) > at > org.qi4j.runtime.composite.AbstractMixinsModel.implementMethod(AbstractMixinsModel.java:89) > at > org.qi4j.runtime.composite.MixinsModel.implementMethod(MixinsModel.java:40) > at > org.qi4j.runtime.composite.CompositeMethodsModel.implementMixinType(CompositeMethodsModel.java:89) > at > org.qi4j.runtime.composite.CompositeMethodsModel.<init>(CompositeMethodsModel.java:51) > at > org.qi4j.runtime.composite.CompositeModel.newModel(CompositeModel.java:67) > at > org.qi4j.runtime.bootstrap.ModuleAssemblyImpl.assembleModule(ModuleAssemblyImpl.java:241) > at > org.qi4j.runtime.bootstrap.ApplicationFactoryImpl.newApplication(ApplicationFactoryImpl.java:123) > at > org.qi4j.runtime.bootstrap.ApplicationFactoryImpl.newApplication(ApplicationFactoryImpl.java:84) > at > org.qi4j.runtime.bootstrap.ApplicationFactoryImpl.newApplication(ApplicationFactoryImpl.java:53) > at > org.qi4j.bootstrap.Energy4Java.newApplication(Energy4Java.java:60) > at > org.qi4j.core.test.osgi.internal.Activator.start(Activator.java:48) > at > org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:1009) > at java.security.AccessController.doPrivileged(Native Method) > at > org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:1003) > ... 10 more > Caused by: net.sf.cglib.core.CodeGenerationException: > java.lang.reflect.InvocationTargetException-->null > at > net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:237) > at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377) > at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317) > at > org.qi4j.runtime.composite.ConstructorsModel.instantiationClass(ConstructorsModel.java:217) > ... 27 more > Caused by: 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 net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:384) > at > net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:219) > ... 30 more > Caused by: java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Factory > at java.lang.ClassLoader.defineClass1(Native Method) > at java.lang.ClassLoader.defineClass(ClassLoader.java:620) > ... 36 more > > _______________________________________________ > qi4j-dev mailing list > [email protected] > http://lists.ops4j.org/mailman/listinfo/qi4j-dev > -- Cheers, Stuart
BytecodeGen.java
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