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From "Tommy Svensson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KARAF-5242) Classloading not compliant with java .class structure/content
Date Sun, 09 Jul 2017 13:05:00 GMT
Tommy Svensson created KARAF-5242:

             Summary: Classloading not compliant with java .class structure/content
                 Key: KARAF-5242
                 URL: https://issues.apache.org/jira/browse/KARAF-5242
             Project: Karaf
          Issue Type: Bug
    Affects Versions: 4.1.1
         Environment: Linux run in Vagrant.
            Reporter: Tommy Svensson

I get the following stack trace in the log:

Caused by: java.lang.ClassNotFoundException: Unable to load class 'se.natusoft.osgi.aps.web.adminweb.WebContentServer$_closure1$_closure5'
because the bundle wiring for aps-admin-web-a2 is no longer valid.
        at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1515)
        at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:79)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1958)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:?]
        ... 44 more

Note that '_closure1' is an inner class and that '_closure5' is in inner class of '_closure_1'.

Bytecode wise they both reside in WebContentServer.class, and there is no such thing as "se.natusoft.osgi.aps.web.adminweb.WebContentServer$_closure1.class"
nor "se.natusoft.osgi.aps.web.adminweb.WebContentServer$_closure1$_closure5.class"! 

>From decompiled WebContentServer.class:


public class WebContentServer extends VertxConsumer implements Consumer<Vertx>, Constants
    public class _closure1 extends Closure implements GeneratedClosure {
        public _closure1(Object _thisObject) {
            super(WebContentServer.this, _thisObject);

        public Object doCall(Consumed<Router> router) {
            WebContentServer.pfaccess$01((WebContentServer)this.getThisObject(), router);
            class _closure5 extends Closure implements GeneratedClosure {
                public _closure5(Object _thisObject) {
                    super(_closure1.this, _thisObject);


This is compiled from Groovy code with is still compatible with java5 byte code standard.
I have not read anywhere that java8 is not capable of running java5 byte code, and when the
code is run in unit tests with java8 there is no problem. So I conclude that this problem
resides in Karaf or more probably Felix which is at the bottom as I understand it. It is with
Karaf I have the problem so it is here I report this. 

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