Fixing the ‘JNI Error Has Occurred’ in Minecraft

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If you’ve run into the ‘JNI Error Has Occurred‘ while using Java or playing Minecraft, you’re not alone. This error can be frustrating but there are solutions. We’ll explain what a JNI error is and what commonly causes it.

Then, we’ll provide step-by-step solutions to fix the issue, making your experience with Java or Minecraft smoother.

What is the JNI Error in Minecraft?

The Minecraft JNI error is like a computer language confusion. It pops up as messages like “A JNI error has occurred” when Minecraft can’t chat right with your computer. Usually, it’s because Minecraft has issues with its Java version or the tools it needs to run well.

The game needs certain tools to work, and if they don’t get along, you see this error. It’s like talking in two languages at once, and your computer gets puzzled. To solve it, make sure the game and your computer agree on the tools they use.

It is worth mentioning that the Java error can manifest differently in Minecraft depending on whether it is a server-side or client-side issue.

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What is Java Native Interface or JNI?

JNI helps Java talk to other languages like C or C++. It acts as a bridge, letting Java and other codeshare data and functions.

Developers use JNI to mix Java with other code for powerful and efficient apps. It is a toolbox that lets developers combine Java and other code to create versatile and high-performing applications.

What causes JNI Errors?

Now, let’s examine some of the common causes of JNI errors:

  • Incorrect configuration: If the JNI configuration is not properly set up, it can lead to errors when trying to interface with native code.
  • Missing or incompatible native libraries: If the required native libraries are missing or not compatible with the Java application, a JNI error may occur.
  • Memory management issues: Mishandling memory allocation and deallocation in the native code can also result in JNI errors.
  • Version incompatibility: When using JNI, it is important to ensure that the versions of Java and the native code are compatible.
  • Inadequate resource management: Failing to properly manage system resources, such as files or hardware components, within the native code can lead to JNI errors. Resource leaks and conflicts can disrupt the interaction between Java and the native code.
  • Improper data type conversions: Incorrect conversions between Java data types and native data types in the JNI can trigger errors. Mismatched data types can lead to unexpected behaviour, crashes, or data corruption in the application.

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How Java Error Impacts Minecraft Gameplay?

The ‘JNI Error Has Occurred’ error can disrupt the normal flow of gameplay in Minecraft. Some of the issues experienced are:

  • Java errors can cause Minecraft to crash or freeze.
  • They may result in missing or glitched textures and graphics.
  • Game performance can suffer, making it laggy and slow.
  • Features like mods and certain gameplay mechanics may not work correctly.
  • Frequent Java errors can make the game unplayable until fixed.

Minecraft Server vs. Client Side Issues

“JNI Error Has Occurred” in Minecraft: Check if it’s a problem with the game server (server-side) or your own computer (client-side). Server-side means issues with the Minecraft server, while client-side means your computer and game.

  1. Server-Side Issues – Server-side “JNI Error” in Minecraft can crash the server, disconnect players, and lead to data loss. Server admins should fix it to keep the server stable.
  2. Client-Side Issues – Client-side “JNI Error” in Minecraft mainly impacts players. It can make the game crash, freeze, or lose features. Fixing it on your side is crucial for uninterrupted gameplay.

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How to Fix “JNI error has occurred” in Minecraft?

Now let’s dive into the step-by-step solutions to fix the Java error. Follow the steps mentioned below.

1. Update Java Runtime:

  • Go to the official Java website.
  • Download the latest version of Java.
  • Install the downloaded file.
  • Restart your computer and try launching Minecraft again.

2. Reinstall Minecraft:

  • Back up any saved games or worlds.
  • Uninstall Minecraft from your system.
  • Go to the official Minecraft website.
  • Download and install the latest version.
  • Try launching the game.

3. Check for Modifications:

  • Navigate to your Minecraft mods folder.
  • Remove or disable any recently added mods.
  • Restart Minecraft.
  • If the error is resolved, add mods back one by one to identify the problematic one.

4. Adjust System Environment Variables:

  • Right-click on ‘My Computer’ or ‘This PC’ and select ‘Properties.’
  • Click on ‘Advanced system settings.’
  • Under the ‘Advanced’ tab, click ‘Environment Variables…’
  • In the ‘System Variables’ section, look for ‘Path’ and edit it.
  • Ensure it includes the path to your Java installation. If not, add it.
  • Apply changes and restart your PC.

5. Use Minecraft’s Native Launcher:

  • Instead of third-party launchers, use the official Minecraft Launcher.
  • Download it from the official Minecraft website if not already installed.
  • Launch the game using this launcher.

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How to Prevent JNI Errors in Future?

While troubleshooting and fixing the Java error is important, taking preventive measures and following best practices can help mitigate future occurrences. Here are some recommendations:

  1. Keep Java Updated: Regularly update your Java installation to ensure compatibility with Minecraft and prevent potential JNI errors.
  2. Verify Mod Compatibility: Before adding mods to your Minecraft, ensure they are compatible with your game version and with each other to avoid conflicts.
  3. Monitor Community Feedback: Stay informed by following Minecraft community forums and discussions for any reported issues or solutions related to JNI errors.
  4. Regular Backups: Periodically back up your Minecraft world and settings to safeguard against data loss in case an error occurs.
  5. Maintain a Clean Environment: Keep your computer free from unnecessary clutter and optimize its performance to reduce the chances of JNI errors interfering with your gameplay.


Dealing with the ‘JNI Error Has Occurred’ in Java apps or Minecraft can be frustrating, but there’s a way to fix it. Just ensure your Java is up-to-date and that your Minecraft mods play nicely together.

It’s a matter of understanding the issue, seeking help from the community, and making sure your Java setup is in good shape to ensure a smoother gaming experience.

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Minecraft “a jni error has occurred” FAQs

1. What is the “a JNI error has occurred in Minecraft” error?

The error means there’s an issue with Java, which Minecraft relies on. It can disrupt the game.

2. How can I fix the “JNI error” in Minecraft?

Follow five simple steps: update Java, update your graphics driver, check for software conflicts, allocate more RAM, and reinstall Minecraft.

3. Why is updating Java important for fixing this error?

Minecraft runs on Java, so ensuring you have the latest version helps resolve compatibility issues.

4. Why update graphics drivers for Minecraft?

Outdated graphics drivers can cause conflicts; updating them can help Minecraft run smoothly.

5. How do I allocate more RAM for Minecraft?

In the Minecraft launcher, go to “Installations,” edit the profile, and increase the allocated RAM to 2GB or more.