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VerifyError, Bad type in putfield/putstatic
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created by <a href="http://community.jboss.org/people/sergio.celentano">Sergio Celentano</a> in <i>Javassist</i> - <a href="http://community.jboss.org/message/582609#582609">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi guys,</p><p>I am running into some problems while trying to use javassist facilities to implement a java fault injection tool.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p>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:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>        Loader cl = (Loader)my.app.SubImpl.class.getClassLoader();</strong></p><p><strong>        String className = "org.opensplice.dds.dcps.FooTypeSupportImpl";</strong></p><p><strong>        String metaObject = "my.wrapper.Injector";</strong></p><p><strong>        try {</strong></p><p><strong>            cl.makeReflective(className,</strong></p><p><strong>                              metaObject,</strong></p><p><strong>                              "javassist.tools.reflect.Metaobject");</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>            cl.run("my.app.SubImpl", args);</strong></p><p style="padding-left: 30px;">     <strong>...</strong></p><p style="padding-left: 30px;"><strong><br/></strong></p><p>The problem rises when I run my program with this statement "java javassist.tools.reflect.Loader my.wrapper.Controller", I get this error:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>java.lang.VerifyError: (class: org/opensplice/dds/dcps/FooTypeSupportImpl, method: <clinit> signature: ()V) Bad type in putfield/putstatic</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I hope my explanation was enough clear, any advice is appreciated =)</p><p>Thank in advance,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Sergio</p></div>
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