eclipselink PersistenceUnitLoadingEception in executable JAR

Question

I am developing a stand-alone java application which uses eclipselink. It is all fine when I execute the app from eclipse IDE. But I\'ve exported an executable JAR file, and

Answer 1

Right click on the project -> Properties -> Java Build Path -> Order and Export, and select the libraries

Right click on the project -> Export... -> Runnable JAR file -> Copy required libraries into a sub-folder next to the generated JAR This worked for me.