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TROUBLESHOOTING.md

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Troubleshooting

Problem 1 - Catch type is not a subclass of Throwable in exception handler 47

Story: I had this problem on 2024-11-14.

ref

OpenJDK 64-Bit Server VM warning: Option AllowRedefinitionToAddDeleteMethods was deprecated in version 13.0 and will likely be removed in a future release.
Connected to the target VM, address: '127.0.0.1:27473', transport: 'socket'
Error: Unable to initialize main class cpw.mods.bootstraplauncher.BootstrapLauncher in module cpw.mods.bootstraplauncher
Caused by: java.lang.VerifyError: Catch type is not a subclass of Throwable in exception handler 47
Exception Details:
  Location:
    cpw/mods/bootstraplauncher/BootstrapLauncher.loadLegacyClassPath()Ljava/util/List; @47: astore_2
  Reason:
    Type 'java/io/IOException' (constant pool 328) is not assignable to 'java/lang/Throwable'
  Bytecode:
    0000000: 1301 3cb8 012c 4b2a c600 372a 03bd 0016
    0000010: b800 4e4c 2b03 bd00 76b8 013e 9900 232b
    0000020: 03bd 0076 b801 4199 0018 2bb8 0144 b04d
    0000030: bb01 4a59 2aba 014c 0000 2cb7 014d bf12
    0000040: 0d13 0150 b801 2cb8 0025 4c2b 1301 52b8
    0000050: 0154 572b b601 5a9a 0007 b801 5eb0 2bb2
    0000060: 000f b600 2ab8 0160 b0                 
  Exception Handler Table:
    bci [42, 46] => handler: 47
  Stackmap Table:
    full_frame(@47,{Object[#22],Object[#85]},{Object[#328]})
    chop_frame(@63,1)
    append_frame(@94,Object[#22])

Disconnected from the target VM, address: '127.0.0.1:27473', transport: 'socket'

Process finished with exit code 1

This error shows only when debugging the run configuration, running it in normal mode worked properly. Was able to fix this by downgrading IDEA from 2024.3 to 2024.2.4. Also did gradlew --no-daemon clean and gradlew --no-daemon --refresh-dependencies build somewhere in between. Also renamed .idea to .idea.bak and invalidated caches a few times. Cursed error but seems to have been quelled for now.

Today, 2025-01-10: I was happily using IDEA Ultimate edition 2024.3 but had to switch to IntelliJ IDEA Community Edition and I tried version 2024.3.1.1 but re-encountered the above error. Downgrading to IntelliJ IDEA Community Edition 2023.3.8 has restored my ability to use the IntelliJ run configurations to launch the game in debug mode.

General things to try when something isn't working

  • .\gradlew.bat --no-daemon clean
  • .\gradlew --no-daemon --refresh-dependencies build

  • remove run configurations from intellij gui and run the genIntellijRuns gradle tasl

  • run the runData gradle task to generate missing files and apply changes

  • neoforged/RenderNurse may help with debugging graphics problems but I personally haven't tried it

  • Look at the run configuration and make sure the correct JDK and module are specified

  • If you have problems with runClient not working in debug mode, try it in normal play mode first. If that fails, try running the gradle task directly instead of using the IntelliJ run configuration.

  • Go to project structure and remove all the modules, remove all the run configurations, and re-import the Gradle project, then run genIntellijRuns