How To Fix “A JNI Error Has Occurred” in Minecraft


The game might experience errors while playing and this could be really irritating for the gamers when your favorite Minecraft game stops working and displays a JNI error has occurred Minecraft server.

Do you know about the JNI error? Why “a JNI error has occurred Minecraft” and how to resolve it?

Do not worry friends. We are here to help you with this problem. We have explored various ways and tried them, and have bought the best methods for you to get rid of this error.

In this article, we are going to explain everything related to this error from the causes to the solution of a JNI error that has occurred.

What is Minecraft

Minecraft is a famous game that lets users construct, explore, and survive in a vast virtual environment. The Java-based game engine is written fully in the Java programming language and employs its own native instruction set. The JNI can be used for two things: calling native libraries and passing parameters from Java to these libraries.

What is a jni error has occurred Minecraft? 

A JNI error is issued in Java when the language attempts to call an object in a class that does not exist or attempts to create an object in a class that does not have any methods. This can occur for a variety of reasons, the most common of which is that the class was altered or destroyed by another software.

The most common solutions to get rid of this error that has occurred in Minecraft server issues are:

  • Deleting the Minecraft application, then downloading it again from Minecraft’s website
  • Deleting all of your files, then downloading them again from your computer’s hard drive

A JNI Error Has Occurred in Minecraft

A JNI error has occurred in Minecraft when it attempts to utilize a class that does not exist or when it attempts to build an object of a class that does not have a function for what you want it to accomplish. This is a Java Native Interface error that happens when the software attempts to access a class that does not exist.

The cause of the JNI error occurred Minecraft

The cause for a JNI error that has occurred in Minecraft is usually found in one of these areas. There are a lot of possible causes for this error. It can be caused by several factors like:

  • Older Java versions were supported by server software that was included with earlier versions of Minecraft. This is not the case with the most recent update to Minecraft, which now needs Java to function correctly.
  • The Minecraft launcher is deceived into believing that Java is not truly installed on your computer by the Java system path, which is corrupted.

Whatever the root cause of this issue is, the methods provided below will enable you to quickly resolve it.

How To fix a JNI Error has occurred MineCraft?

“a JNI error has occurred” happens when a Java program cannot find a class. In this case, the error is usually caused by an incorrect library path or missing dependencies.

Step 1: Check your java -version and make sure it is at least 1.8

Step 2: Make sure you have all the required libraries

Step 3: Make sure the command java -version returns a 1.8 version

Step 4: Make sure you have the latest version of Java (or your program requires it)

Try these ways to fix the JNI error:

This section will surely provide you with a few steps on how to fix a JNI error that has occurred in Minecraft.

Launch the game and try to join a server

If you are having trouble joining the server, it is most likely because of the JNI error. This error is caused by many things such as a bad connection or an out-of-date version of java.

If you are still having trouble joining the server, try to relaunch the game with a different java version from the one that is installed.

For the people who are stuck in a world that they cannot get out of because a JNI has occurred in Minecraft, try these steps to fix the issue.

1. Close the game and reopen it.

2. If that still does not work, try deleting your Minecraft folder and then downloading it again from the launcher.

3. If you are still stuck, restart your computer and check if that helps.

Install the latest version of JAVA

If you are getting a JNI error, it means that you do not have the latest version of java installed on your system. To fix the issue, download and install the latest version of java on your system.

There are several reasons why the Java runtime environment (JRE) may fail to install on your computer. This is usually caused by a missing or outdated Java installation, which can be fixed by following these steps:

  • – Download and install the latest version of Java from Oracle’s website.
  • – Uninstall any older versions of Java that you have installed.
  • – Restart your computer and try installing again.

Linux users can fix Minecraft errors by installing Java.

The following instructions should be entered in the terminal application to manually install Java on your Linux operating system:

sudo apt-get update

sudo apt install openjdk-18-jdk

For them to work effectively, always remember to issue one command at a time. But be sure to use the most recent Java version to replace the number “18.” You can look it up quickly online.

Reinstall Minecraft

Reinstalling the Minecraft game is a common solution for the JNI error that has occurred. This solution will allow you to reinstall the Minecraft application without losing your world progress or saving data. To do this, follow these instructions:

1. Open Windows Explorer and go to C:\Users\YOURUSERNAMEHERE\AppData\Roaming\.minecraft

2. Delete everything in the “junk” folder.

3. Download Minecraft again from the launcher in windows.

Uninstall outdated Java versions from your computer (Optional)

If you have the most recent version of Java installed on your machine, you can run Minecraft and any other software without seeing JNI issues. Previous versions of Java won’t have an impact either. However, if you’d like to free up some space and make sure that Minecraft is using the most recent installation, you can delete them regardless. How? Read on.

1. To begin, press Windows and look for the Control Panel. Click the Control Panel link in the search results to launch it.

2. Next, select the “Programs” section’s “Uninstall a software” option.

3. All of your system’s Java versions can be found here. Clicking on them will reveal their version number and double-click to uninstall it. 

Error A JNI error has occurred when running jar

Windows CMD JNI Error

  • The issue can arise if you want to use the Windows CMD command line to call a.jar file, such as by using the command java -jar File.jar, or if you already compiled your program with Eclipse.
  • You must change the Java environment variables in order to resolve the problem.
  • To achieve this, open the “Edit System Environment Variables” option by typing “environment variable” into your Windows search box. You select “Environment variables…” by clicking in this window.
  • The window labeled “Environment variables” appears. You then click “Edit…” after selecting the variable “Path” in the lower pane “System variables” there.
  • Find the line that stores the installation path for your Java JDK there. This may be found in my case under C:Program FilesJavajdk-13.0.1bin.
  • By selecting “New,” you can add this entry if you don’t already have one.
  • When the entry is at the top, select the line containing the Java JDK and click “Move up.” Done!
  • The Windows-CMD must now be closed and opened again in order to fix the error.


JNI errors are less common these days because of more recent versions of the game. However, even if you happen to run into one, you now have the ability to fix JNI problems in Minecraft. You will undoubtedly find it useful when you attempt to create your own Java-based Minecraft server.

In addition, you can use the technique to cut down on mistakes while using the best Minecraft mods. Having said that, please get in touch if you continue to get JNI or similar issues with Minecraft.

Frequently Asked Questions:

1.  How can I fix the JNI error in Minecraft?

The JNI error is an error message that appears on the screen when you are trying to run a program written in Java. This error is caused when the system cannot find a method or class that you are trying to call.
There are two ways you can fix this jni error:
– You can update your Java version so it is compatible with your computer’s new version of java.
– You can try again after restarting your computer and running the program with administrator privileges.

2. what are some common causes of the JNI error?

A JNI error is a Java Native Interface error. It occurs when the application is trying to use a class that has been compiled and linked but has not yet been loaded by the Java virtual machine. It can be caused by an incompatible version of the JNI library or an incorrect path to the JNI library.

3.      What is a JNI error?

A Java Native Interface (JNI) error is an error that occurs when the JVM cannot find the class or method it’s looking for. JNI errors can be caused by bad code, missing libraries, or other misconfigurations.
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