I have found a possible explanation for the exception at eclipse startup. I found, that BundleResourceHandler.context is null and therefore the exception is thrown. This static context field is set in BundleResoureHandler.setContext(..) which is called in AbstractFrameworkAdapter.frameworkStart(..)
I searched for where this is called, and found it at the end of org.eclipse.osgi.framework.internal.core.SystemBundleActivator.start(..) now look at the stacktrace: java.lang.NullPointerException at org.eclipse.osgi.framework.adaptor.core.BundleResourceHandler.openConnection (BundleResourceHandler.java:138) at java.net.URL.openConnection (URL.java:652) at java.net.URL.openStream (URL.java:665) at org.eclipse.osgi.framework.internal.core.ManifestLocalization.getResourceBundle (ManifestLocalization.java:114) at org.eclipse.osgi.framework.internal.core.ManifestLocalization.getHeaders (ManifestLocalization.java:52) at org.eclipse.osgi.framework.internal.core.AbstractBundle.getHeaders (AbstractBundle.java:1032) at org.eclipse.osgi.framework.internal.core.AbstractBundle.getHeaders (AbstractBundle.java:982) at org.eclipse.osgi.framework.internal.core.SystemBundleActivator.register (SystemBundleActivator.java:97) at org.eclipse.osgi.framework.internal.core.SystemBundleActivator.start (SystemBundleActivator.java:44) you see, that the exception is thrown during exactly this start(..) call _before_ frameworkStart(..) is called. So it is very possible that the context is not yet set at the point where register(..) is called. The question is, why does this error not occur with Suns VM? Maybe java.net.URL.openConnection should not go into org.eclipse.osgi.framework.adaptor.core.BundleResourceHandler.openConnection() ?? another question now is, where is the URL itself constructed. After spinning through the endless spagetti code (why didn't they write it in Basic??) I found org.eclipse.osgi.framework.adapter.core.AbstractBundleData.getEntry as the method that actually creates the URL. ok, now I hope this helps more than my last statements.. /Roman
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