I am not able launch JNLP applications using “Java Web Start”?

Question

Up until recently, I was able to launch/open JNLP files in Firefox using Java web start.

Don\'t know what happened all of a sudden JNL

Answer 1

If javacpl does not open and gives you Could not find the main class:, it could be that Java is confused because of changes in deployment.properties (can be found in C:\Users\\AppData\LocalLow\Sun\Java\Deployment on Win7). Delete that file and everything's fine.

This bug seems to be 6 years old, cf. An app should be able to ignore properties that have become obsolete over time, shouldn't it?