Hey @hexiaokai, I see limitations in working with modules (Java 9+) on VS Code. First issue I found is that it is incorrectly injecting a classpath into the modulePaths property.

@brunoborges could you provide a sample project to help reproduce this issue? i'm trying to understand the purpose of the fix...

https://github.com/brunoborges/fx2048 is a Java project that uses Gradle to run, and so far it has been extremely painful to get VS Code to debug it.

this project is using JavaFX 12, actually it needs to be launched as modules. Currently the debugger put the javafx libraries into -cp, that's the reason for the failure. They should be placed at --module-path instead of --classpath arguments. For example, the following command is able to launch 2048 game.

"C:\Program Files\Java\jdk-11.0.1\bin\java"  -Dfile.encoding=UTF-8 --module-path C:\Work\Debugger\Bug_Cases\fx2048\bin\main;C:\Users\jinbwan\.gradle\caches\modules-2\files-2.1\org.openjfx\javafx-controls\12\45d9af154b384e2eb9d787f5d8621b4f54df0d28\javafx-controls-12-win.jar;C:\Users\jinbwan\.gradle\caches\modules-2\files-2.1\org.openjfx\javafx-graphics\12\ec4fc19a5d3469da4a7539ce0cc7d2b48bf484d0\javafx-graphics-12-win.jar;C:\Users\jinbwan\.gradle\caches\modules-2\files-2.1\org.openjfx\javafx-graphics\12\8796b8816a3272d8ee4660e7f4627d61243c4084\javafx-graphics-12.jar;C:\Users\jinbwan\.gradle\caches\modules-2\files-2.1\org.openjfx\javafx-base\12\70354cbca618a7a61d46a10539d079dca345f535\javafx-base-12-win.jar;C:\Users\jinbwan\.gradle\caches\modules-2\files-2.1\org.openjfx\javafx-base\12\3179ee52ad6d4cf3ccd306e48f3d8cbf9078b038\javafx-base-12.jar -m fxgame/game2048.Game2048

I'm not following...