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From James Carman <ja...@carmanconsulting.com>
Subject Re: [VFS] ClassLoader pickle with OSGi (ClassCastException)
Date Thu, 14 Jun 2012 18:00:39 GMT
Are you using dynamic imports?

On Thu, Jun 14, 2012 at 1:58 PM, Gary Gregory <garydgregory@gmail.com>wrote:

> 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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> > >> For additional commands, e-mail: dev-help@commons.apache.org
> > >>
> > >
> > > ---------------------------------------------------------------------
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> > >
> >
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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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