[pde-dev] NoClassDefFoundError IContentOutlinePage and eclipse -clean

["Paul Davern" <p.davern@xxxxxxxxx>]

Hello,

 

I am extending a "prolog" editor plugin for eclipse. The original plugin did not have a content outline.

When I install the new plugin with content outlining (like the java editor plugin example) into eclipse as a jar file

I get the following error:

 

java.lang.NoClassDefFoundError: org/eclipse/ui/views/contentoutline/IContentOutlinePage

 

org.eclipse.ui.views is included under the required bundle header of the manifest file.

 

 

If I run eclipse with the -clean option the error disapears and the plugin works as I would expect.

 

I can recreate the error as follows:

1. put the old plugin back into eclipse\plugin directory

2. fire up eclipse and I get my prolog file without its content outlining.

3. shut down eclipse an put the new version into the eclipse\plugin directory.

4. fire up eclipse with -clean and I get the error is back.

 

What is going on here? Is it a problem in my code or a feature of eclipse?

Does eclipse maintain some form of cache which "remembers" that a plugin

does not require content outlining?  and so will not create a ContentOutline object for it because it remembered that

the plugin did not require content outlining the last time it was run?

 

Thanks very much,

Paul.