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From Gary Gregory <garydgreg...@gmail.com>
Subject [VFS] ClassLoader pickle with OSGi (ClassCastException)
Date Wed, 13 Jun 2012 21:16:45 GMT
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
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