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[equinox-dev] [prov] Strange error message: org.osgi.framework.BundleException: State change in progress for bundle ...

I started to refactor SimpleArtifactRepositoryFactory to use ECFTransport instead of using URL.openStream() to load the artifacts.xml.
In my first attempt I was using ECFTransport to download artifact.xml into a temporary file and than reading its content with SimpleArtifactRepositoryIO. This worked very well (I used ProvAdminUI for testing) but I didn´t like the temporary file storage. My second attempt was to use a PipedInput/Ouputstream pair to do that. Therfore I start a download thread which uses ECFTransport pushing into the PipedOutputStream and the linked PipedInputStream is read by SimpleArtifactRepositoryIO.
When I now start ProvAdminUI I got the following error message:


!ENTRY org.eclipse.osgi 2 0 2007-12-17 08:32:25.687
!MESSAGE While loading class "org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport$1", thread "Thread[Thread-2,6,main]" timed out waiting (5000ms) for thread "Thread[main,6,main]" to finish starting bundle "initial@reference:file:../../projekte/rcp/org.eclipse.equinox.p2.artifact.repository/ [17]". To avoid deadlock, thread "Thread[Thread-2,6,main]" is proceeding but "org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport$1" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: State change in progress for bundle "initial@reference:file:../../projekte/rcp/org.eclipse.equinox.p2.artifact.repository/" by thread "main".
at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1139)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:259)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:419)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:344)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:412)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:373)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:361)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport.transfer(ECFTransport.java:72)
at org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport.download(ECFTransport.java:67)
at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepositoryFactory$Transporter.run(SimpleArtifactRepositoryFactory.java:68)
Caused by: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
... 16 more
Root exception:
org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1139)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:259)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:419)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:344)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:412)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:373)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:361)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport.transfer(ECFTransport.java:72)
at org.eclipse.equinox.internal.p2.artifact.repository.ECFTransport.download(ECFTransport.java:67)
at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepositoryFactory$Transporter.run(SimpleArtifactRepositoryFactory.java:68)


It seems that is not possible to load the ECF class IFileTransferListener within a thread (this happens at ECFTransport.java:72).
The Activator of o.e.e.p2.artifact.repository creates the ArtifactRepositoryManager which does a restoreRepositories() in its constructor. This causes an attempt to create a SimpleArtifactRepository which than fails with the above error. When I delay the restoreRepositories() until it is really needed than the error does no longer occur.
It seems that there is a difference between loading a class (from another bundle) from the ´main´ thread and from a spawned thread while activating a bundle.
What is the difference?


Stefan