“duplicate entry” error when exporting Java project to JAR with Eclipse

Question

I am trying to exort a Java project with Eclipse 3.6.1 to a runnable Jar. This used to work properly but failed today, afer I added some additional Jars to my class path.

Answer 1

I too had the same problem, but then I slightly modified the build settings in Eclipse to the one mentioned below.

This solved the duplicate entry issue for me, it just copies all required jars to a subdirectory.