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  1. Minecraft: Java Edition
  2. MC-131315

Unable to launch modded Minecraft with Java 10 due to a bugged Library

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Invalid
    • Affects Version/s: Minecraft 1.12.2
    • Fix Version/s: None
    • Environment:

      Windows 10 64-bit
      Java Runtime Environment 10.0.1

    • Confirmation Status:
      Unconfirmed

      Description

      I am unable to launch modded Minecraft using the latest Minecraft Launcher with Java 10. I am reporting this bug in the Mojang Bug Tracker because it has something to do with the Minecraft Launch Wrapper.

      Here's the last line in the launcher_log.txt:

      [0614/144307:INFO:GameCallbacks.cpp(178)] launcher/launcher (main) info Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader[0614/144307:INFO:GameCallbacks.cpp(178)] launcher/launcher (main) info Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
      at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
      at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

      Steps to reproduce

      Install any modification for Minecraft (OptiFine for example)

       Note that the bug here is the Minecraft Launch Wrapper, which is a Minecraft library, and not the modification.

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            • Assignee:
              Unassigned
              Reporter:
              LR G. iTechieGamer
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              Dates

              • Created:
                Updated:
                Resolved: