Eclipse - Source not found

I know this question has been asked many times before, but none of the proposed solutions resolve my issue (or I'm not implementing them correctly).

I'm developing a plugin for OpenFire, and when I set a breakpoint in my plugin source Eclipse reports "Source not found". The JAR is built separate from the build of the OpenFire server. I've tried adding the JAR and specifying the source code directory, but no dice.

Here's the process I'm following: When I hit my breakpoint I'm clicking "Edit Source Lookup Path", clicking "Add", Java Library, User Library, click User Libraries, adding my library (tried both "Add JARs" and "Add External JARs"), and then specifying the folder that contains the source code. I've also tried:

• Adding the source by selecting "File System Directory" instead of "Java Library"
• Adding it by selecting "Workspace Folder"
• In the Project Explorer, adding the source for my plugin to the Java Build Path
• In the Project Explorer, adding my JAR as a Library and specifying the Source attachment

Thanks in advance for any suggestions.

Well it turns out the solution was anticlimactic. When Balder's recommendations did not work I tried debugging one of the stock OpenFire plugins and it worked just fine. I then created a new plugin from scratch, and by doing nothing other than adding the source to the project (Right-click on the project -> New -> Source Folder) it also worked just fine. I have no idea why Eclipse refuses to see the source for my original plugin, but I moved all my code and libraries over to the new plugin and debugging is working as expected.