[windup-dev] previously initiated loading for a different type with name "org/jboss/forge/furnace/util/Predicate"

Lincoln Baxter, III lincolnbaxter at gmail.com
Fri Mar 27 09:51:13 EDT 2015 

Hey Ian,

I'm taking a look at this now. I'll have more information for you soon.

~Lincoln

On Fri, Mar 27, 2015 at 8:35 AM, Ian Tewksbury <itewk at redhat.com> wrote:

> Lincoln and Jess,
>
>
> I have spent another evening trying to defeat this class loading error
> with no luck.
>
>
> What I have tried:
>
>    1. Debugging CompositeFurnaceClassLoader
>       1. changed #loadClass to #findClass as per ClassLoader suggestion,
>       didn't help
>       2. put break point in #findClass to see how many times it is called
>       for org.jboss.forge.furnace.util.Predicate, it is only being called once,
>       and on that one call it is failing with the LinkageError, this makes 0
>       sense to me since the error says that it has already been loaded
>       3. Tried various combinations of checking to see if the class has
>       already been loaded, no luck
>       4. Tried creating a cache of already loaded classes, didn't help,
>       which makes sense because the #findClass method (or #loadClass if you dont
>       use my change) only gets called once for this class.
>    2. I have updated the windup-eclipse plugin to use the latest furnace
>    version, 2.15.2.Final, didn't make a difference
>    3. I have updated the windup-eclipse plugin to use the latest Windup
>    2.2.0 Release, plus my changes to add default constructor to WindupService
>    and FileService
>    4. I have stopped using my custom loadType function I was talking
>    about earlier, that was a red hearing I believe
>    5. I have spent hours googling this error message with no solution
>    path to be fund
>
> At this point I am totally blocked. I don't know what to try next.
>
> My latest code is here:
>
> plugin - https://github.com/windup/windup-eclipse-plugin/tree/windup2
> windup - https://github.com/itewk/windup/tree/windup-eclipse
>     * as a reminder you can't use SNAPSHOT versions for WINDUP when
> compiling the windup eclipse plugin with local changes to Windup because it
> will always pull the snapshot from the remote repository and ignore your
> local changes, unless using releases in which case maven looks at the local
> repo first
>
> Has anyone been able to try and reproduce this themselves yet?
> Has anyone been able to look over my WindupServices class to make sure I
> am properly using Forge/Furnace to access Windup?
>
> I am either doing something really dumb on my end when trying to access
> Windup or there is a bug/logic error with the CompositeFurnaceClassLoader.
>
>
> Blue Skies,
>
> ~Ian
>
>
> !ENTRY org.eclipse.core.jobs 4 2 2015-03-27 08:04:51.234
> !MESSAGE An internal error occurred during: "Validating".
> !STACK 0
> java.lang.LinkageError: loader constraint violation: loader (instance of
> org/jboss/tools/forge/core/internal/furnace/CompositeFurnaceClassLoader)
> previously initiated loading for a different type with name
> "org/jboss/forge/furnace/util/Predicate"
> at java.lang.Class.getDeclaredMethods0(Native Method)
> at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
> at java.lang.Class.getDeclaredMethods(Class.java:1860)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.SecurityActions.getDeclaredMethods(SecurityActions.java:30)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.findMethod2(RuntimeSupport.java:134)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.findMethod(RuntimeSupport.java:65)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.RuntimeSupport.find2Methods(RuntimeSupport.java:53)
> at
> org.jboss.windup.exec.configuration.WindupConfiguration_$$_javassist_bdf99157-4ab9-4bb9-a9ec-03565e9d16d6.<clinit>(WindupConfiguration_$$_javassist_bdf99157-4ab9-4bb9-a9ec-03565e9d16d6.java)
> at sun.misc.Unsafe.ensureClassInitialized(Native Method)
> at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
> at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:140)
> at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1057)
> at java.lang.reflect.Field.getFieldAccessor(Field.java:1038)
> at java.lang.reflect.Field.set(Field.java:741)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:525)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:508)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:492)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:428)
> at
> org.jboss.forge.furnace.proxy.javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:400)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$3.call(ClassLoaderAdapterCallback.java:987)
> at
> org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.enhance(ClassLoaderAdapterCallback.java:900)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.enhanceResult(ClassLoaderAdapterCallback.java:253)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.access$200(ClassLoaderAdapterCallback.java:37)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$2.call(ClassLoaderAdapterCallback.java:124)
> at
> org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42)
> at
> org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.invoke(ClassLoaderAdapterCallback.java:96)
> at
> org.jboss.forge.furnace.services.Imported_$$_javassist_48ac554d-8d60-4d09-8f17-c0a42f2c85b7.get(Imported_$$_javassist_48ac554d-8d60-4d09-8f17-c0a42f2c85b7.java)
> at
> org.jboss.tools.forge.core.furnace.FurnaceService.lookup(FurnaceService.java:96)
> at
> org.jboss.tools.windup.core.WindupService.getServiceFromFurnace(WindupService.java:485)
> at
> org.jboss.tools.windup.core.WindupService.generateGraph(WindupService.java:226)
> at
> org.jboss.tools.windup.core.WindupService.getGraph(WindupService.java:301)
> at
> org.jboss.tools.windup.core.WindupService.getInlineHints(WindupService.java:103)
> at
> org.jboss.tools.windup.core.internal.validators.WindupValidator.validate(WindupValidator.java:81)
> at org.eclipse.wst.validation.Validator$V2.validate(Validator.java:1159)
> at
> org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:704)
> at
> org.eclipse.wst.validation.internal.ValManager$1.visit(ValManager.java:665)
> at
> org.eclipse.wst.validation.internal.ValManager.accept(ValManager.java:810)
> at
> org.eclipse.wst.validation.internal.ValManager.validate(ValManager.java:669)
> at
> org.eclipse.wst.validation.internal.ValidationRunner.execute(ValidationRunner.java:134)
> at
> org.eclipse.wst.validation.internal.ValidationRunner.validate(ValidationRunner.java:68)
> at
> org.eclipse.wst.validation.ui.internal.ManualValidationRunner.runInWorkspace(ManualValidationRunner.java:83)
> at
> org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
> at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
>
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>



-- 
Lincoln Baxter, III
http://ocpsoft.org
"Simpler is better."
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