Sergio Celentano [http://community.jboss.org/people/sergio.celentano] created the discussion "VerifyError, Bad type in putfield/putstatic" To view the discussion, visit: http://community.jboss.org/message/582609#582609 -------------------------------------------------------------- Hi guys, I am running into some problems while trying to use javassist facilities to implement a java fault injection tool. As an application (lets call it "worklaod") invokes a method from a third-party library, my tool should intercept this method, modify the parameters value on-the-fly and call the original method. Running through the tutorials provided with javassist library I found that the "sample/reflect/*.java" should suit my case and I took it into account as a starting point to implement my tool. So, following that tutorial, my "Injection" class extends the "javassist.tools.reflect.Metaobject" class and implement the "trapMethodCall()" method, in which I realize the arguments substitution. Another class (my.wrapper.Controller) implements the following snippet, in which "my.app.SubImpl" is the workload and "classNam" is the class whose methods I want to intercept: *        Loader cl = (Loader)my.app.SubImpl.class.getClassLoader();* *        String className = "org.opensplice.dds.dcps.FooTypeSupportImpl";* *        String metaObject = "my.wrapper.Injector";* *        try {* *            cl.makeReflective(className,* *                              metaObject,* *                              "javassist.tools.reflect.Metaobject");* *            cl.run("my.app.SubImpl", args);* *...* * * The problem rises when I run my program with this statement "java javassist.tools.reflect.Loader my.wrapper.Controller", I get this error: *java.lang.VerifyError: (class: org/opensplice/dds/dcps/FooTypeSupportImpl, method: <clinit> signature: ()V) Bad type in putfield/putstatic* Furthermore I must say that the class "org.opensplice.dds.dcps.FooTypeSupportImpl" is an abstract class and methods I want to intercept are public and static and I am almost sure that this is the main cause of the issue. I wonder if there's any work-around for it. I hope my explanation was enough clear, any advice is appreciated =) Thank in advance, Sergio -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/582609#582609] Start a new discussion in Javassist at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]