[Workaround found] NetBeans 7.2 does not create JAR file although it claims it did

[spirit]

EDIT: I solved the problem described in this post by deleting all NB project files, restarting NB and then creating a New Java Project with Existing Source Code.

Hello,

I've been using NB for a while and now I've run into the first real problem: After an update from 7.01 to 7.2, NB won't create the .jar file for one of my applications. It is configured to do so (see this screenshot) and the app compiles fine, I can even run it from NB. NB also claims it had created the jar file, but it didn't.

Here is the full output of BUILD AND CLEAN:

[spirit]

UPDATE: The problem is there again: no JAR file.

The only way to get around it is to create a new project every time it happens, so if anybody knows how to get rid of it once and for all, please share your knowledge!