Java 7 JVM VerifyError in Eclipse

Question

When I compile my project in eclipse indigo using JDK 7, I get the following error dialog

Answer 1

When I had this problem, I fixed it by deleting my JDK 1.7 system libraries from the project, and added the 1.6 JDK libraries instead. I went to run the project again, and I didn't get the error. When I added the JDK 1.7 libraries in again, it still works, so something in the 'swapping' makes it work.