Java .class file disappeares as soon as I run the project
I've been on a project where I build tetris that has multiplayer, and it's been working for a couple of days with no problem, but now suddenly there's this exception:
Exception in thread "main" java.lang.NoClassDefFoundError: Game/Piece
This basically means it can't find the .class of my class called Piece, but whenever I do a "clean and build" the .class file appears, then instantly disappears when I run the project.
This is my project structure (running with JDK 16, in netbeans):
Is there a reason for this exception?
My JAVA_HOME variable: jdk1.8.0_131.
So apperantly I had a warning (not an error) when compiling, it said something was depracated, so I had to add a compiler option name -Xlint:(something here I can't remember), so when I compiled it the issue was obvious, JFrame.hide() is a depracated function so I just had to remove it. It's weird that the runtime error was "NoClassDefFoundError" which has nothing to do with the issue.
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