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Re: [pde-dev] Plugin not started 
Brian Bauman schrieb:
Can you attach the two projects (or a small scale replica) you are having problems with. NoClassDefFoundErrors can be caused by a variety of reasons. Is the class you are looking for which resides in a jar file or is it in a source folder ready to be compiled?
The class is in a source folder. It's compiled (the .class file exists) and it it's in the package, which is explicitly exported by plugin B. It's not somewhere in a subfolder of the package but exactly in the folder corresponding to the exported package.
Unfortunately I don't know the exact license of the code, as it's part of a research project at my university. I will have to ask, whether I'm allowed to post the project. The next problem: There are more then two projects involved! I would have to send you a dozen of projects, as the all interdependent.
Could you please give me any advice where to search for failure reasons (typical problems with classloaders, further maybe hidden errorlogs) or how to debug in the meantime?
I'm quiet confused, as eclipse lists the broken plugin B in the plugin details window, but cannot use it - and don't give me any more errormessages which I could use for debugging! 

Thanks and greets
Boris




Brian Bauman
    IBM Software Group - Austin, TX
    Eclipse Committer
    baumanbr@xxxxxxxxxx
    (512) 838 -2938 (T/L 678-2938)



From: 	Boris Glawe <public@xxxxxxxxxxxxxx>
To: 	pde-dev@xxxxxxxxxxx
Date: 	10/02/2007 11:32 AM
Subject: 	[pde-dev] Plugin not started


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Hi,

I don't know, whether I'm right here - but I can't find a better place
to find help for my problem:

I have a lot of eclipse projects in my workspace, each of them
implementing an eclipse plugin. These plugins depend on each other.

Let's say Plugin A requires plugin B.

If I've understood eclipse correctly, a plugin gets loaded, as soon as
one of it's classes, is being instantiated (Yes, lazy loading is set to
true in the MANIFEST.MF). Is that correct?

My problem:

Plugin A requires a class that is in B. With the first trial to
instantiate this class, I get a NoClassDefFoundError.

I've set a breakpoint at the very top of the Constructor of the
activator's class of plugin B but the debugger never reaches this point
before the thrown error!


I conclude from this, that eclipse never tries to load the plugin!

The plugina A and B are listed in help->about->plugin details!

Where could I begin with the search for the failure reason?

Plugin B is  listed in the Required-Plugins section of A's MANIFEST.MF.

B's packages that are required in A are explicitly exported in the
MANIFEST.MF!

There's a cyclic dependency between A and B! Some Classes of B need to
be instantiated during the execution of A's start() method. I've already
tried to remove this cyclic dependency, by commenting out all lines in
the start() method, that access B's classes. Unfortunately this didn't help. 

Do you have any idea, what I could try next? Except the error log, I
don't know where to find more information.


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