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[news.eclipse.newcomer] Re: Strange NoClassDefFoundError
Ankur Sharma wrote:
Jochen wrote: 
Hi,

I have a strange NoClassDefFoundError with my plugin.
The plugin loads fine with Eclipse, when I open the run configuration provided by the plugin I get the proper dialogs and everything, but when I try to "Run" the run-configuration I get the NoClassDefFoundError for the class that "Run" delegates to.
I'm a bit stumped by this, because obviously Eclipse finds some of the classes in my plugin, but not others.

Possibly relevant bits of my plugin.xml:

  <runtime>
      <library name="muclipse.jar">
         <export name="*"/>
      </library>
   </runtime>



So if I get it right, you are writing a plugin for the IDE. Now this JAR (muclipse.jar) is a just a jar or a plugin itself?
If its a plguin, you should be adding it as a "dependency" rather than an external library.
But if its just a java jar then i hope you are adding it through manifest editor -> build page -> Extra Classpath entries.

Not quite. When building, I pack the compiled Java classes _of the plugin_ into that JAR, and on the "Runtime" page I specify this JAR as the library constiuting the runtime of the plugin.
As a side note, I "inherited" the plugin from sourceforge and this is how it was set up there. But after recompiling in my workspace, the deployed plugin no longer works.


Other than this I can't think why you should be seeing this exception. Check the "Java Build Path" properties page once of any access restrictions (I doubt there'll be any).

Since the plugin is "old-style", it doesn't have an OSGi manifest, and hence there are no access restrictions that I can see.
I also tried to use the wizard to create an OSGi manifest, but with that Eclipse fails to start because apparently then the plugin.xml and the manifest are somehow in conflict and I don't know enough about those things to fix them.

Jochen