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Weld 1.1.0-Final : Cannot inherit from final class

 
Albert Kam
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Posts: 58
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I decided to try out the newer Weld, which is 1.1.0-Final, and here' the maven i added successfully:



Restarting my tomcat on my newly deployed webapp with the newer Weld displays this in the log file :

SEVERE: Error deploying web application directory primebert
java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2818)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1148)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1643)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:1947)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:1910)
at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1797)
at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1756)
at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1742)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1245)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:874)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4974)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1044)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:967)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1302)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:343)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:323)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1043)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1035)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:724)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
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:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:304)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)


So basically, using Weld 1.0.1-Final, this error doesnt happen. Switching to 1.1.1.Final, this happens.

I tried finding all my java source which has the final class, and tried removing the final words, and redeploy, but still, with the same error.

Any ideas why this is happening ?

Thank you !
 
Tim Holloway
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Apparently, you're attempting to subclass a Weld class whose definition changes in release 1.1. Someone on the Weld development team redefined the class as final, which means that you can no longer subclass it.

Usually that means that you were doing something not quite legal to begin with, but to know more, you're going to have to find out which class was trying to load and what its base class is.
 
Albert Kam
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Posts: 58
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Hello, thank you for sharing your thought.

But as long as i can remember, i never extend any classes from weld.
 
Tim Holloway
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Actually, you normally shouldn't even be able to compile a class that's attempting to inherit from a final class. So that means that something needs recompiling somewhere.

About the best advice I can offer is to set a breakpoint in your IDE to catch java.lang.VerifyError, then when the breakpoint is taken, walk up the stack until you can find the name of the class that's being loaded and look at that class. It appears to be an annotation processor class, so there's a strong possibility that you have a version mismatch between your JBoss libraries somewhere.
 
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