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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 NullPointerExceptionOutOfMemoryError: in the crash report.

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

      • Cause: Typically

        Edit causedyour bystart ascript variableto orallocate objectmore being null when the code expects a value.

      • Fix: Check mods or pluginsmemory, for compatibilityexample:

        issues
        java or-Xmx4G configuration-Xms2G errors.-jar paper.jar

    3. OutOfMemoryError:

      • Cause: The server has run out of allocated memory.
      • Fix: Upgrade your plan to increaseIf the amountissue of RAM orpersists, reduce the number of modsplugins andor plugins.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. MissingPlugin Mods/Dependenciesor Mod Conflicts:

    • CauseSymptoms: RequiredCrashes involving conflicting plugins or mods will show multiple references to conflicting classes or dependenciesmethods arein notthe present.stack trace.
    • FixSteps to Diagnose: Ensure all necessary mods and their dependencies are correctly installed and up-to-date.

  • ConcurrentModificationException:

    • Cause: A mod or plugin is modifying a collection while it is being iterated.
    • Fix: Update or remove the offending mod or plugin.

    • Resolving Mod-Related Issues

    1. Check for Updates:

      • Ensure all mods and plugins are up-to-date and compatible with your server’s Minecraft version.

    2. Remove Conflicting Mods:

      • Temporarily remove recently added mods to identify if they are causing the crash.

    3. Review Mod Configuration:

      • Check the configurationcrash filesreport for any repeated references to the same classes or methods across different plugins/mods.
      • Disable or remove half of your installed plugins or mods to ensurenarrow theydown arethe correctlysource setof up.the conflict.
      • Update or replace conflicting plugins.

    AdditionalExample HelpError:

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

    IfThis youpoints encounterto anya issuespotential conflict during plugin loading. It may be necessary to update or needdisable furtherone assistance, open a support ticket viaof the Billingconflicting Area. Our support team is here to help you diagnose and resolve server crashes.plugins.

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