Here is what I did, and it worked :
- Right-click on your project
- Build Path > Add External Archives
- Select your archive (.jar)
The library.jar will be added to the 'Referenced Libraries' in your project, but not in the folder of your project. I can now run my project with that external library, and I don't get errors, but I don't know if it is the usual way to do it. My archive is not in the 'libs' folder, as everyone. You should try what I did.
