Java 7 update 25 makes our java web start application fail with no logging

Question

Since the java 7 update 25 launched by Oracle our application no longer functions.

Initially we got some warning about codebase & sercurity tags missing in the M

Answer 1

Eventually the problem was solved. The problem was caused between a mismatch in the included jar files in the main MANIFEST.MF file vs the jar files mentioned in the launch.jnlp.

Apperently it is now required to have all jar files that will be used also be present in the launch.jnlp file.

(In the past it was decided to keep this file manually in sink, which obviously was not always maintained in a propper way. Now this process is automated, so the problem should no longer happen to us.)