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Date: Thu, 14 Jun 2012 13:58:16 -0400
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Subject: Re: [VFS] ClassLoader pickle with OSGi (ClassCastException)
From: Gary Gregory <garydgregory@gmail.com>
To: Commons Developers List <dev@commons.apache.org>
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On Thu, Jun 14, 2012 at 1:03 PM, Dan Tran <dantran@gmail.com> wrote:

> Thanks for discover this issue. Look likes FileProvider get excluded
> from export list?
>

I do not think so, the 2.0 MANIFEST.MF includes:

Export-Package: org.apache.commons.vfs2.impl;version="2.0",org.apache.
 commons.vfs2.provider.url;version="2.0",org.apache.commons.vfs2.provi
...

The class is found and instantiated, but it cannot be cast because it comes
from a different class loader.

Gary


>
> -D
>
> On Thu, Jun 14, 2012 at 4:53 AM, Gary Gregory <garydgregory@gmail.com>
> wrote:
> > The classLoader ivar is initialized differently in 1.0 than in 2.0.
> > That's why the CCE shows up. A different class loader is used. I'm not
> > sure if there is a bug in 2.0 that was introduced when the classLoader
> > use was changed. I'm starting to think this was an unexpected side
> > effect.
> >
> > Gary
> >
> > On Jun 14, 2012, at 2:08, Ralph Goers <ralph.goers@dslextreme.com>
> wrote:
> >
> >> I have no idea why it worked in 1.0 and fails now. As far as I can tell
> the call to createManager has always been there. I have no idea why.
> >>
> >> But I also don't know why
> >>
> >>> Caused by: java.lang.ClassCastException:
> >>> org.apache.commons.vfs2.provider.local.DefaultLocalFileProvider cannot
> be
> >>> cast to org.apache.commons.vfs2.provider.FileProvider
> >>
> >> is happening.  That should be valid.
> >>
> >>
> >> Ralph
> >>
> >> On Jun 13, 2012, at 2:16 PM, Gary Gregory wrote:
> >>
> >>> Hi All:
> >>>
> >>> When I run under our OSGi (Eclipse Equinox) set up with 2.0, I get this
> >>> pickle:
> >>>
> >>> org.apache.commons.vfs2.FileSystemException: Could not create a file
> system
> >>> manager of class
> "org.apache.commons.vfs2.impl.StandardFileSystemManager".
> >>>   at org.apache.commons.vfs2.VFS.createManager(VFS.java:99)
> >>>   at org.apache.commons.vfs2.VFS.getManager(VFS.java:50)
> >>>   at
> >>>
> com.seagullsw.toolbox.config.ConfigurationDirectory.resolveFileObject(ConfigurationDirectory.java:315)
> >>>   at
> >>>
> com.seagullsw.toolbox.config.Configuration.resolveFileObject(Configuration.java:135)
> >>> <Snip: ...my app frames...>
> >>>   at
> >>>
> com.seagullsw.appinterface.server.osgi.JCicsOsgiTestCase.testJcicsOsgiRoundtrip(JCicsOsgiTestCase.java:226)
> >>>   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> >>>   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> >>>   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> >>>   at java.lang.reflect.Method.invoke(Unknown Source)
> >>>   at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:307)
> >>>   at
> org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86)
> >>>   at
> >>>
> org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:112)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:73)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
> >>>   at
> org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
> >>>   at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
> >>>   at
> >>>
> org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
> >>>   at
> >>>
> org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
> >>>   at
> >>>
> org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
> >>>   at
> >>>
> org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:102)
> >>>   at
> >>>
> org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> >>>   at
> >>>
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
> >>> Caused by: org.apache.commons.vfs2.FileSystemException: Could not load
> VFS
> >>> configuration from
> >>>
> "bundleresource://7.fwk545215872:34/org/apache/commons/vfs2/impl/providers.xml".
> >>>   at
> >>>
> org.apache.commons.vfs2.impl.StandardFileSystemManager.configure(StandardFileSystemManager.java:199)
> >>>   at
> >>>
> org.apache.commons.vfs2.impl.StandardFileSystemManager.init(StandardFileSystemManager.java:123)
> >>>   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> >>>   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> >>>   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> >>>   at java.lang.reflect.Method.invoke(Unknown Source)
> >>>   at org.apache.commons.vfs2.VFS.createManager(VFS.java:88)
> >>>   ... 49 more
> >>> Caused by: java.lang.ClassCastException:
> >>> org.apache.commons.vfs2.provider.local.DefaultLocalFileProvider cannot
> be
> >>> cast to org.apache.commons.vfs2.provider.FileProvider
> >>>   at
> >>>
> org.apache.commons.vfs2.impl.StandardFileSystemManager.addProvider(StandardFileSystemManager.java:371)
> >>>   at
> >>>
> org.apache.commons.vfs2.impl.StandardFileSystemManager.configure(StandardFileSystemManager.java:270)
> >>>   at
> >>>
> org.apache.commons.vfs2.impl.StandardFileSystemManager.configure(StandardFileSystemManager.java:195)
> >>>   ... 55 more
> >>>
> >>> Which I work around with:
> >>>
> >>>   private void initVfs() {
> >>>       StandardFileSystemManager fsm = new StandardFileSystemManager();
> >>>       fsm.setClassLoader(fsm.getClass().getClassLoader());
> >>>       try {
> >>>           FieldUtils.writeDeclaredStaticField(VFS.class, "instance",
> fsm,
> >>> true);
> >>>           fsm.init();
> >>>       } catch (FileSystemException e) {
> >>>           ...
> >>>       } catch (IllegalAccessException e) {
> >>>           ...
> >>>       }
> >>>   }
> >>>
> >>> Two questions:
> >>>
> >>> (1) Why is org.apache.commons.vfs2.VFS.getManager() coded with a class
> name
> >>> ref instead of the a real Class object or an actual instance:
> >>>
> >>>   public static synchronized FileSystemManager getManager()
> >>>       throws FileSystemException
> >>>   {
> >>>       if (instance == null)
> >>>       {
> >>>           instance =
> >>>
> createManager("org.apache.commons.vfs2.impl.StandardFileSystemManager");
> >>>       }
> >>>       return instance;
> >>>   }
> >>>
> >>> Why not:
> >>>
> >>>   public static synchronized FileSystemManager getManager()
> >>>       throws FileSystemException
> >>>   {
> >>>       if (instance == null)
> >>>       {
> >>>           instance = new StandardFileSystemManager();
> >>>           // where the StandardFileSystemManager constructor calls
> init();
> >>>       }
> >>>       return instance;
> >>>   }
> >>>
> >>> If not, what about adding a setManager(FileSystemManager)?
> >>>
> >>> This did not happen in 1.0, it worked fine in OSGi.
> >>>
> >>> Thank you,
> >>> Gary
> >>>
> >>> --
> >>> E-Mail: garydgregory@gmail.com | ggregory@apache.org
> >>> JUnit in Action, 2nd Ed: <http://goog_1249600977>http://bit.ly/ECvg0
> >>> Spring Batch in Action: <http://s.apache.org/HOq>http://bit.ly/bqpbCK
> >>> Blog: http://garygregory.wordpress.com
> >>> Home: http://garygregory.com/
> >>> Tweet! http://twitter.com/GaryGregory
> >>
> >>
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-- 
E-Mail: garydgregory@gmail.com | ggregory@apache.org
JUnit in Action, 2nd Ed: <http://goog_1249600977>http://bit.ly/ECvg0
Spring Batch in Action: <http://s.apache.org/HOq>http://bit.ly/bqpbCK
Blog: http://garygregory.wordpress.com
Home: http://garygregory.com/
Tweet! http://twitter.com/GaryGregory

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