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From Gary Gregory <garydgreg...@gmail.com>
Subject Re: [VFS] ClassLoader pickle with OSGi (ClassCastException)
Date Thu, 14 Jun 2012 11:53:41 GMT
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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