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Diagnosing Common Crash Causes

Mod or Plugin Issues

  • Symptoms: The crash report references a specific mod or plugin, often with an error such as NullPointerException, ClassNotFoundException, or NoClassDefFoundError.
  • Steps to Diagnose:
    1. Open the crash report and look for references to a mod or plugin in the stack trace.
    2. Ensure that all mods/plugins are compatible with your Minecraft version and up-to-date.
    3. If a recently added mod or plugin caused the crash, remove it and restart the server.

Example Error:

Caused by: java.lang.NullPointerException: null
   at com.example.mod.ModClass.someMethod(ModClass.java:42)

In this case, you may need to update or disable ModClass.

2. World Corruption

  • Symptoms: Crashes related to world generation or chunk loading are often caused by corrupted world files.
  • Steps to Diagnose:
    1. Open the crash report and check for keywords like “World Generation” or “Chunk Loading”.
    2. Backup the world folder and test with a clean, new world to see if the crash persists.
    3. Use tools like WorldEdit or RegionFixer to repair corrupted chunks.

Example Error:

at net.minecraft.world.gen.ChunkGenerator.func_225535_a_(ChunkGenerator.java:122)

This points to an issue during world generation or chunk loading, likely due to a corrupted world file.

3. Out of Memory (OOM) Issues

  • Symptoms: Crashes caused by memory limitations will show a java.lang.OutOfMemoryError in the crash report.
  • Steps to Diagnose:

    1. Look for the OutOfMemoryError in the crash report.

    2. Increase the amount of RAM allocated to your server in your startup parameters.

      • Edit your start script to allocate more memory, for example:

        java -Xmx4G -Xms2G -jar paper.jar

    3. If the issue persists, reduce the number of plugins or mods, optimize server settings, or upgrade the server.

Example Error:

java.lang.OutOfMemoryError: Java heap space

This indicates your server ran out of allocated memory and needs more resources to run properly.

4. Plugin or Mod Conflicts

  • Symptoms: Crashes involving conflicting plugins or mods will show multiple references to conflicting classes or methods in the stack trace.
  • Steps to Diagnose:
    1. Check the crash report for any repeated references to the same classes or methods across different plugins/mods.
    2. Disable or remove half of your installed plugins or mods to narrow down the source of the conflict.
    3. Update or replace conflicting plugins.

Example Error:

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:78)

This points to a potential conflict during plugin loading. It may be necessary to update or disable one of the conflicting plugins.

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