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July 20, 2022
Why does this “a JNI error has occurred” error occur? Here are possible reasons:
Whatever the cause of this problem, the solutions below will help you fix it in no time.
This a JNI error has occurred Minecraft server error occurs when you try to start Minecraft or a Minecraft server on a PC that does not have the latest version installed. To fix this, you just need to update your current Java to the latest version.
Tip: Make sure the Minecraft launcher (Tlauncher or any other) is completely closed.
Step 2: After downloading Java, install the software on your computer. You just double-click the downloaded executable and allow the installer to make changes when asked.
After that, you can check if the “a JNI error has occurred” error still appears.
Remove Broken System Path Variables for Java
If the first method doesn’t work, then this “a JNI error has occurred Minecraft” error is due to a corrupted system path variable for Java.
In this case, you can fix the problem by visiting the System Properties screen and modifying the environment variables in a way that removes the Java environment variables.
To do so, here is the guide:
After removing the offending environment variable, restart your PC, then start Minecraft again and see if the “a JNI error has occurred ” issue is fixed.
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Step 1: Press the Win + R key to open the Run dialog box. Then type sysdm.cpl in it and press Enter.
Step 2; In the System Properties window, switch to the Advanced tab, and then click on the Environment Variables button.
Step 3: Once enter the System Variables window, under the System variables section, select Path and click on the Edit button.
Step 4: In the next window, find the environment variables for Java. Then click it and click Delete.
Bottom Line
Vega joined MiniTool as an editor after graduation. She enjoys helping people with computer problems, including disk management, data recovery, and more. She is constantly expanding her knowledge in related fields. And she will continue to bring more easy-to-understand professional articles to help people solve various problems on the PC. In her daily life, Vega enjoys hanging out with friends, shopping online and listening to music. She is someone who knows how to enjoy life.
by Henderson Jayden Harper
Updated on December 7, 2022
INSTALL BY CLICKING THE DOWNLOAD FILE
Hence, knowing how to fix Java Virtual Machine launcher fatal exception errors will be beneficial.
Games like Minecraft depend on Java libraries to function on your PC. So, issues with the Java library will affect the game client. It can prompt Windows error 2 while loading the Java VM on the system.
Also, compatibility is a common cause of the problem. If you’re using a Minecraft server, mods, or a feature that is incompatible with the Java library, you will likely encounter this error.
Other factors that can cause the JNI error has occurred in Minecraft are:
The above-listed causes may differ depending on the circumstances around the error. Nonetheless, you can fix the error by troubleshooting your PC.
If the error persists, go on with the solutions below.
Reset Java Path
Resetting the Java path will fix Java runtime environment errors that can cause the error.
Uninstall Old Versions of Java
Alternatively, our readers can check ways to fix JAR files not opening on Windows 11. Also, you can read about fixing Java update/install not complete error 1603 on your PC.
If you have more questions or suggestions, do not hesitate to use the comments below.
Still experiencing issues?
If the above suggestions have not solved your problem, your computer may experience more severe Windows troubles. We suggest choosing an all-in-one solution like Fortect to fix problems efficiently. After installation, just click the View&Fix button and then press Start Repair.
As you might already know, Minecraft Java Edition is the most powerful version of the game. You can customize it, upgrade it, and modify it using the best Minecraft mods as per your desires – offline and online alike. But, that also makes it vulnerable to a variety of errors. One of the most common and dreadful series of errors is the JNI errors. Fortunately, it’s super easy to solve this Java error affecting Minecraft in no time, thanks to a couple of easy fixes. So, let’s check out how to fix “A JNI error has occurred” in Minecraft.
We have first covered why the JNI error occurs while setting up a Minecraft server or opening the Minecraft launcher on your PC. However, you can use the table below to directly skip to the solution and fix your game.
Table of Contents
Minecraft Java and all its features depend upon the Java libraries on your computer to function properly. So, if you are using a Minecraft server, mods, or a feature that the library in your system doesn’t support, the game might end up facing an error. Such errors fall into the class of JNI or Java Native Interface errors.
These errors usually occur when the Java files are too new or the Java version of your device is outdated. Sometimes these errors also occur when the installation path of the Java files is broken. In other words, you just need to make sure your Java file and your system’s Java libraries are up to date and compatible with the version of Minecraft mod or server you have installed. Doing so will immediately fix the problem.
There are four ways to remove the JNI errors in Minecraft Java Edition. So let’s first explain what these methods are and then learn how to fix them:
As you might have guessed, the second option to fix JNI errors in Minecraft is the easiest and most reliable one. You don’t need to do any manual research and only have to update your system’s Java version to fix the error. Here’s how to do it:
1. First, go to Oracle’s official website and look for your system’s OS under the latest section. We are installing Java for Windows, but you can use the same steps for Linux and macOS.
2. Then, download the Java installer file by clicking on its download link. You might have to check for compatibility of the installer on a Linux-based OS.
4. You can change the folder’s location where you are installing the new version of Java. But we suggest you do not do that as many games and software look for Java in the default directory.
5. When the installation is complete, click the “Close” button to exit the installer. Then, you can run your Java files and features, including Minecraft Java Edition, without any JNI errors.
1. First, use the Win Key + R Windows 11 keyboard shortcut to open the run dialog box. Here, type “sysdm.cpl” and press the Enter key. This will open the system properties of your device.
2. In the system properties window, go to the “Advanced” tab and click the “Environment Variables” button.
3. Next, look under the “System variables” section and select the “Path” variable. Then, click on the “Edit” button.
4. Finally, use the “Delete” button to remove the corrupted Java variable paths and restart your PC. If you are not sure about which variable to delete, you can delete all of them and reinstall Java using the steps in the previous section.
sudo apt-get update
sudo apt install openjdk-18-jdk
Remember to use one command at a time for them to function properly. But make sure to replace the digit “18” with the latest version of Java at the moment. You can do a quick search to find it.
Uninstall Old Versions of Java on Your PC (Optional)
You can run Minecraft or any other software without any JNI errors if you have the latest version of Java, and they are not affected by any previous versions of Java installed on your system. But if you want, you can uninstall them anyways to save up some space and be sure that Minecraft uses the latest installation. Here’s how.
1. First, press the Windows key and search for Control Panel. Click to open the Control Panel from the search results.
2. Then, go to the “Uninstall a program” option under the “Programs” section.
3. Here, you can find all versions of Java on your system. You can click on them to check their version number and double-click to uninstall it.
Here’s a list of possible culprits that are most likely responsible for causing the “A JNI error has occurred, please check your installation and try again”:
In most documented cases, this particular error happens when you attempt to launch Minecraft or a Minecraft server on a PC that doesn’t have Java 16 or newer installed. Keep in mind that starting with Minecraft build 21w19, you will need to have Java’s 16 JDK version installed on your PC, otherwise, the game will not launch.
To fix this issue, you will simply need to update your current Java JDK to the most recent version available using the official channels.
If the problem is still not resolved, move down to the next potential fix below.
Remove the broken System Path variable for Java
If the first method was not effective in your case, the next thing you should investigate is a potentially broken system variable used by Java.
A broken variable can be the determining factor in ‘tricking’ your Minecraft launcher into believing that the Java JDK requirement for the game is not installed when it actually is.
In this case, you can get the issue resolved by accessing the System Properties screen and modifying the Environment variables in a way that the Java PATH environment is removed.
Note: The instructions below should work on every recent Windows version including Windows 7, Windows 8.1, Windows 10, and Windows 11.
Kamil Anwar
Kamil is a certified MCITP, CCNA (W), CCNA (S) and a former British Computer Society Member with over 9 years of experience Configuring, Deploying and Managing Switches, Firewalls and Domain Controllers also an old-school still active on FreeNode.
Thanks to newer versions of the game, JNI errors are uncommon nowadays. But even if you somehow stumble upon one, now you have the power to resolve JNI errors in Minecraft. And it’s bound to help you while trying to make your own Minecraft Java server. Other than that, you can also use the method to reduce errors while you use the best Minecraft mods. With that said, if you still have JNI or similar errors in Minecraft, please feel free to reach out. You can drop your queries in the comments section, and someone from our team will help you out.
