Java and Scala ClassNotFoundException after upgrading to IntelliJ 14

Question

I recently upgraded to IntelliJ 14, and then added Scala support.

My main files stopped working. For example, a GUI file that has no errors and is a completely standalone style hello worldfor checking for this error:

Exception in thread "main" java.lang.ClassNotFoundException: GUI

This makes no sense, and I'm very upset that IntelliJ developers are not involved in automatically detecting the solution. I tried to fix it. From the settings, compilers to make a project from scratch.

I was only lucky when they did it from scratch, but as soon as I started adding my other files (files that were not even used!), It starts with an error.

It seems that any files outside the source module of the project (when creating a new project to check for fixes) will not be triggered with a ClassNotFoundException.

This may be due to my other question: https://stackoverflow.com/questions/27516673/cannot-run-file-located-out-of-main-module-intellij-14-java-scala

Answer 1

It turns out that Make, No Error Check does not work the same for scala as it does for Java.

Errors in scala files trigger an ambiguous error message, without a clear link to the error.

Committing scala files fixes the error.

Answer 2

Problem Representation Example

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