[1.12.2] [IntelliJ] Debugging Vanilla Minecraft
I found out that you can debug Vanilla Minecraft with IntelliJ recently. Heres how
1) Go to the Minecraft Launcher and add -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5009 to your JVM arguments
2) Launch Minecraft normally
3) In IntelliJ go to Run > Attach to Process
4) Select net.minecraft.launchwrapper.Launch
Hope this helps someone
You are also able to hot-swap code directly into the running program. If you want to you can also change the JVM to use DCEVM (Dynamic Code Evolution VM) for even more advanced hot-swap, but Mojang's default JVM arguments (specifically the -XX:+UseG1GC argument) cause a crash when using this JVM. The final arguments that I use are
-Xms1536M
-Xmx2048M
-XX:+UnlockExperimentalVMOptions
-XX:G1NewSizePercent=20
-XX:G1ReservePercent=20
-XX:MaxGCPauseMillis=50
-XX:G1HeapRegionSize=32M
-agentlib:jdw