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Posted to dev@geronimo.apache.org by David Jencks <da...@yahoo.com> on 2011/10/18 09:45:49 UTC

Strange classloading problem

I'm seeing this when trying to start a gbean in my osgi friendly code:

java.lang.NoClassDefFoundError: Could not initialize class org.apache.geronimo.tomcat.TomcatServerGBean
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.apache.xbean.recipe.ReflectionUtil$ConstructorFactory.create(ReflectionUtil.java:958)
        at org.apache.xbean.recipe.ObjectRecipe.internalCreate(ObjectRecipe.java:276)
        at org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:96)
        at org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:61)
        at org.apache.geronimo.gbean.runtime.GBeanInstance.createInstance(GBeanInstance.java:975)
        at org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStart(GBeanInstanceState.java:271)
        at org.apache.geronimo.gbean.runtime.GBeanInstanceState.start(GBeanInstanceState.java:105)
        at org.apache.geronimo.gbean.runtime.GBeanInstanceState.startRecursive(GBeanInstanceState.java:127)
        at org.apache.geronimo.gbean.runtime.GBeanInstance.startRecursive(GBeanInstance.java:586)
        at org.apache.geronimo.kernel.basic.BasicKernel.startRecursiveGBean(BasicKernel.java:447)
        at org.apache.geronimo.kernel.config.ConfigurationUtil.startConfigurationGBeans(ConfigurationUtil.java:499)
        at org.apache.geronimo.kernel.config.ConfigurationExtender$StartConfiguration.run(ConfigurationExtender.java:472)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)

Note that the starting point is the missing class.  In the debugger I can reproduce the problem with this:

Constructor c = gbeanClassLoader.loadClass(objectRecipe.getType().getName()).getConstructors()[0];
c.newInstance(null);

and the constructor seems to have all the parameter types and parameter annotations available.

This is using equinox 3.7.1.R37x_v20110808_1106

Does anyone have any ideas how to investigate what is wrong?

thanks
david jencks

Re: Strange classloading problem

Posted by Ivan <xh...@gmail.com>.
what is the value of gbeanClassLoader and the thread context classloader ?
I got a classloader issue in the past, the jvm uses the context loader to
load referenced classes in the target class, while in common mind, the
classloader of the target classloader should be used to load those
referenced classes.

2011/10/18 David Jencks <da...@yahoo.com>

> I'm seeing this when trying to start a gbean in my osgi friendly code:
>
> java.lang.NoClassDefFoundError: Could not initialize class
> org.apache.geronimo.tomcat.TomcatServerGBean
>        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>        at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>        at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
> org.apache.xbean.recipe.ReflectionUtil$ConstructorFactory.create(ReflectionUtil.java:958)
>        at
> org.apache.xbean.recipe.ObjectRecipe.internalCreate(ObjectRecipe.java:276)
>        at
> org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:96)
>        at
> org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:61)
>        at
> org.apache.geronimo.gbean.runtime.GBeanInstance.createInstance(GBeanInstance.java:975)
>        at
> org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStart(GBeanInstanceState.java:271)
>        at
> org.apache.geronimo.gbean.runtime.GBeanInstanceState.start(GBeanInstanceState.java:105)
>        at
> org.apache.geronimo.gbean.runtime.GBeanInstanceState.startRecursive(GBeanInstanceState.java:127)
>        at
> org.apache.geronimo.gbean.runtime.GBeanInstance.startRecursive(GBeanInstance.java:586)
>        at
> org.apache.geronimo.kernel.basic.BasicKernel.startRecursiveGBean(BasicKernel.java:447)
>        at
> org.apache.geronimo.kernel.config.ConfigurationUtil.startConfigurationGBeans(ConfigurationUtil.java:499)
>        at
> org.apache.geronimo.kernel.config.ConfigurationExtender$StartConfiguration.run(ConfigurationExtender.java:472)
>        at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>        at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>        at java.lang.Thread.run(Thread.java:680)
>
> Note that the starting point is the missing class.  In the debugger I can
> reproduce the problem with this:
>
> Constructor c =
> gbeanClassLoader.loadClass(objectRecipe.getType().getName()).getConstructors()[0];
> c.newInstance(null);
>
> and the constructor seems to have all the parameter types and parameter
> annotations available.
>
> This is using equinox 3.7.1.R37x_v20110808_1106
>
> Does anyone have any ideas how to investigate what is wrong?
>
> thanks
> david jencks
>
>


-- 
Ivan