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Re: [equinox-dev] NPE from RegistryStrategyOSGI.onStop()


Hi Jason,
The quick answer is that you need to stop your custom registry before org.eclipse.equinox.registry bundle is stopped.

Normally bundles are stopped in the reverse order of dependency, i.e., if a bundle MyBundle depends on the org.eclipse.equinox.registry, then MyBundle is stopped first on shutdown, then org.eclipse.equinox.registry. So, normally, you could put the code to stop your custom registry into MyBundle's activator#stop().

I *guess* that putting inappropriate bundle start levels could break the shutdown order.

Thanks,
Oleg



"Jason Hao" <jason.hao@xxxxxxxxx>
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10/20/2006 03:52 AM

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[equinox-dev] NPE from RegistryStrategyOSGI.onStop()





Hi all,

I'm working on a project which is based on OSGi and equinox. The project also includes equinox extension registry bundle. Since my extensions are defined in files which are not in side the bundles, I need to load these extensions into registry by IExtensionRegistry.addContribution() method. And addContribution() method needs the master token which is under control of equinox registry bundle and I can't get it, so I have to create my registry instead of using the default registry. Here are what I have done.

1.        Add "-Declipse.createRegistry=false" into VM arguments. This will disable the default registry.
2.        Create my extension registry component and register it with declarative service spec. In the activate() method I creat my OSGi strategy and registry. In the deactivate() method I call IExtensionRegistry.stop() method to stop the registry.
3.        Start my application and the registry works well.
4.        Shutdown the OSGi framework by typing "shutdown" command in the console. org.eclipse.core.internal.registry.osgi.Activator.stop () method is called and the bundle context is set to null. Then my registry deactivate() method is called. I got java.lang.NullPointerException from org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.onStop(RegistryStrategyOSGI.java :204) since the bundle context is null.
I wonder if there's any way I can work around. Thanks.

--
Best Regards,

Jason Hao
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