Can't remove JOGL.JAR from lib/ext in Eclipse

I have JOGL 1.1 and want to upgrade to the new 231 beta 5.

The problem is that i installed the 1.1 jogl.jar in my jdk/jre/lib/ext folder. But now that i removed it (i’ve read that its not good to place it there too) i cant do anything in eclipse.

Regardles of what project i want to start (even if its an old one that does not use any JOGL at all) eclipse says it doesnt want to start because there is something with the build path.

And i cant remove it from the menu because you cant remove system librarys or something like that (i have german eclipse so i dont know if my translations i give you are matching with english eclipse names).

Even if i place the new jogl.jar from 231 in the lib/ext folder i still get the same error. it would be really nice if an experienced eclipse user could help me im totally confused and i dont know what to do at all to remove my old bad style installed - jogl -installation and install the new one in good style to eclipse…

Find your eclipse installation directory. Inside that is a directory named “configuration”. There will be a couple of directories in there and a config.ini file. Delete those directories and restart Eclipse. If that doesn’t fix things, then you may need to delete the “workspace” directory as well (first making sure you’ve pulled out anything that shouldn’t be deleted like some of your project configuration files etc)