| How can I make osgi find a class in an imported jar [message #329755] |
Wed, 02 July 2008 20:20  |
Eclipse User |
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Originally posted by: ku_long.hotmail.com
Hey,
I created a hook plug-in which hooks to osgi.framework.extensions.
In the hook plug-in, some classes in a third party jar were refered.
The hook plug-in can be compiled properly but got
java.lang.NoClassDefFoundError exception on some classes in the third
party lib at runtime. If I put the source code of the third party lib
into the plug-in to replace the binary jar file, everything worked fine.
I tried buddy classloading strategy but I still got that problem. I
created a separate plug-in which contains the third party jar file and
exports the third part lib packages. I made the hook plug-in require the
lib plug-in and set buddy policy between the them. But the problem was
still there. Any thought?
Thanks.
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| Re: How can I make osgi find a class in an imported jar [message #329871 is a reply to message #329755] |
Tue, 08 July 2008 21:07  |
| Eclipse User |
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Originally posted by: ku_long.hotmail.com
After investigation on this issue, it seemed the classes in the third
party jar file are loaded when the
org.eclipse.osgi.baseadaptor.HookRegistry tries to register my hook. This
happened in the very early stage during the start up of eclipse. At that
time, the osgi frame could not regonize those classes yet.
Is there any property I can set to make osgi can recognize them? Thanks.
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| Re: How can I make osgi find a class in an imported jar [message #330121 is a reply to message #330076] |
Tue, 15 July 2008 18:07 |
| Eclipse User |
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Originally posted by: ku_long.hotmail.com
>You can include the jar in your hook (if license allows, of course) and
>update your Bundle-ClassPath. Usually it looks like:
>
>Bundle-ClassPath: ., lib/useful.jar
>
>Check out http://wiki.eclipse.org/Plug-in_Development_Environment and
>http://wiki.eclipse.org/Eclipse_Plug-in_Development_FAQ for more information.
>PW
If the "include the jar in your hook" you said means adding the jar file
into the plug-in's classpath on the "Runtime" page of the MANIFEST file
editor,that is what I did. I included the jar (to be more specific, I used
ASM-3.0.jar in the hook plug-in) into my hook plug-in and I can see the
Bundle-ClassPath property contains the jar file. I think the problem is
that my hook class is instantiated in
org.eclipse.osgi.baseadaptor.HookRegistry.java when OSGI is being
configured. That's a very early stage of the startup of eclipse. I believe
at that point, OSGI has not been initiated yet. See the following code in
the HookRegistry, here an instance of my hook class is created:
private void loadConfigurators(ArrayList configurators, ArrayList errors) {
for (Iterator iHooks = configurators.iterator(); iHooks.hasNext();) {
String hookName = (String) iHooks.next();
try {
Class clazz = Class.forName(hookName);
HookConfigurator configurator = (HookConfigurator) clazz.newInstance();
configurator.addHooks(this);
} catch (Throwable t) {
// We expect the follow exeptions may happen; but we need to catch all
here
// ClassNotFoundException
// IllegalAccessException
// InstantiationException
// ClassCastException
errors.add(new
FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME,
FrameworkLogEntry.ERROR, 0, "error loading hook: " + hookName, 0, t,
null)); //$NON-NLS-1$
}
}
}
My hook class refers to some classed in ASM-3.0.jar, and a
ClassNoDefException was thrown here. I think at this point, the hook
plug-in has not been initiated and activated yet. The classloader can not
find the class. I oberved in the debug view, the classloader is called
Main$StartupClassLoader.
Thanks.
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