[news.eclipse.platform.rcp] Re: intermittent NoClassDefFoundError

["Marc E" <marc.esher@xxxxxxxxxxx>]

thanks for replying Jens.

 In my case, I'd think that wouldn't be the problem because the problem I'm 
having is with org.apache.commons...., and I don't believe any of that is in 
the jdk. Maybe I'm wrong on that?

thanks.

Marc


"Jens Rutschmann" <Jens.Rutschmann@xxxxxxxx> wrote in message 
news:gc2j5j$k08$1@xxxxxxxxxxxxxxxxxxxx
> Marc E wrote on 01.10.2008 02:41:
> > Jens, it does sound similar. I saw that before posting my problem but 
> > notice you still haven't gotten any responses.  Hopefully something will 
> > turn up.
>
> Ok,
> I found something out: The "Export-Package" directive in MANIFEST.MF seems 
> to mask packages from the JDK.
>
>
> In other words:
> The plugin that I created for the xmlbeans distribution JARs contains in 
> its "Export-Package" directive the package "org.w3c.dom" because xmlbeans 
> provides some classes in this package.
>
> The JDK contains the same package, although in the JDK other classes are 
> in the package.
>
> Apparently the Eclipse classloader only provides the classes that are 
> contained in the plugin's package "org.w3c.dom", but not those from the 
> JDK's "org.w3c.dom" package.
>
> So I removed the entry from the export directive, hoping that no dependent 
> plugin would require the classes from those package. Now the application 
> runs, but I don't think it's a clean solution.
>
>
> Perhaps in your case it depends on the order that plugins are being loaded 
> whether the missing class can be found or not? Just an idea ...
>
> Probably others reading this newsgroup know more about that. Would be 
> especially interesting to know if that "masking" effect can be disabled.
>
>
> I hope this helps you somehow,
> Jens