I recently upgraded to IntelliJ 14, then added Scala support.
My main files stopped running. For example the GUI file, which has no errors and is a totally self contained hello world style for testing this error:
Exception in thread "main" java.lang.ClassNotFoundException: GUI
It makes no sense and I'm pretty frustrated that the IntelliJ devs are slacking in not auto-detecting a solution to this. I have tried everything to fix it. From settings, compilers, to making the project from scratch.
I only had a bit of luck when making it from scratch, but as soon as I started to add my other files (files that were not even being used!) it starts with the error.
It seems that any files outside of the original project module (when creating a new project to test fix) will not run giving ClassNotFoundException.
This may be related to my other question: https://stackoverflow.com/questions/27516673/cannot-run-file-located-out-of-main-module-intellij-14-java-scala
Turns out that Make, No Error Check does not work the same for scala as it does for Java.
Errors in the scala files will cause an ambiguous error message on run, with no clear link to the error.
Fixing the scala files fixes the error.
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