“Error: A JNI error has occurred, please check your installation …” – How to fix it!

You have encountered this JNI Error error message? Don’t panic! The problem can usually be solved quite quickly – and here you can find out how.

Have you encountered this error message or popup?

Error: A JNI error has occurred, please check your installation and try again

JNI Error Popup
Java Virtual Machine Launcher: JNI Error Popup

The problem comes from the fact that your JRE (Java Runtime Enviroment), that is your installed Java version and your JDK (Java Development Kit) do not work together correctly.

Now there are several possible solutions for you. Just choose the scenario that applies to you:

JNI Error in Windows CMD

JNI Error when starting a Minecraft Server

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JNI Error in Minecraft TLauncher

JNI Error in Windows CMD

The problem can occur if you want to call a .jar file via command line (Windows CMD), e.g. via the command java -jar File.jar or if you have compiled your program with Eclipse before.

To fix the error, you need to adjust the environment variables for Java.

  • To do this, type “environment variable” in your Windows search and open the “Edit System Environment Variables” item. In this window you click on “Environment variables…”.
System properties - screenshot
System properties – screenshot
  • The “Environment variables” window opens. There you select the variable “Path” in the lower window “System variables” and click on “Edit…”.
Environment variables - screenshot
Environment variables – screenshot
  • There you look for the line where the installation path of your Java JDK is stored. In my case this is under C:\Program Files\Java\jdk-13.0.1\bin.

If you don’t have a Java JDK installed yet, you can download and install the .exe installation file (“x64 Installer”) here.

  • If you do not have this entry, you can add it by clicking the “New” button.
Edit environment variables - screenshot
Edit environment variables – screenshot
  • Select the line with the Java JDK and click on “Move up” until the entry is at the top. Done!
  • Now you have to close and reopen the Windows-CMD once and the error should be fixed.

JNI Error when starting a Minecraft Server

If you try to start your Minecraft server via the official server.jar (error occurs since version 1.17), you may get this error message:

JNI Error Popup
Java Virtual Machine Launcher: JNI Error Popup

JNI Error in Minecraft TLauncher

This error message can also appear when launching the Minecraft TLauncher.

Java JDK Download Page
Java JDK Download Page
  • Right-click on the downloaded file and click “Extract here”.
  • Copy the unzipped folder to the directory C:\Program Files\Java
  • Launch your Minecraft TLauncher and click on the gear in the bottom right corner
  • Click at “Java path” on “Browse…” and choose C:\Program Files\Java\jdkX\bin\javaw.exe (replace the X by the name of your JDK folder).
  • Save everything – now the game should start again

Java JNI error message still appears?

  • Restart your computer
  • Uninstall old Java versions under Control Panel > Programs > Programs and Features and install the latest Java JRE and Java SDK.

I hope that you were able to fix the JNI error with the help of this post. If this is still not the case, feel free to write me a comment.

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37 Comments

  1. Riley says:

    I do not see a gear icon in launcher? Where is it so how do I change the Java path?

    1. Lorenz says:

      In the bottom right corner it should be

  2. Simon Gillessen says:

    I am in the same situation as the comment: “Hi, I got as far as the part where you look for the installation path of your JDK, and I didn’t see the entry so I clicked on new but it didn’t do anything. Then I clicked on the link that you put for if you haven’t installed the JDK, but I’m not sure what I’m supposed to download once I get there. Any help would be amazing, I have no clue what I’m doing but this tutorial was very easy to follow up until the point that I got lost so thank you!”I downloaded the software you told the user to download but I don’t know how to use this software?! it’s just a casual win.rar document that does nothing.

    1. Lorenz says:

      You are under Windows? Just download the “x64 Installer”. This is an exe-file that installs the JDK.

      Hope this helps! 🙂

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  4. Tate Hayman says:

    Thank you so much for the help! It worked perfectly!

  5. Eglantine says:

    Hi, I started to do as you explained but when I select “Path” in the lower window of the environment variables, I can’t press any button : not edit, nor new, nor erase… But the upper window allows me to press those buttons. Could you please help me with this ?Thanks in advance

    1. Lorenz says:

      Are you logged in as administrator? Maybe this is the problem…

      1. Vicky says:

        And what can I do if I can’t access to the administrator account?…

      2. Vicky says:

        And if I can’t access to the administrator account, what can I do?…

        1. Lorenz says:

          I’m not sure. Then you won’t be able to customize them….

          Search in Windows for “Enviroment”, there are also local environment variables, which are only for your account. Maybe you can adjust them and fix the problem.
  6. Majo says:

    Wow! It worked Thanks a lot!

  7. Aiden says:

    I dont understand the last step what do i have to do in command propmt

    1. Lorenz says:

      For example, if your error occurred when running in CMD (e.g. java -jar test.jar), you can try again afterwards. If you had the error somewhere else you don’t need to do that of course.

  8. Breanna says:

    Hi, I got as far as the part where you look for the installation path of your JDK, and I didn’t see the entry so I clicked on new but it didn’t do anything. Then I clicked on the link that you put for if you haven’t installed the JDK, but I’m not sure what I’m supposed to download once I get there. Any help would be amazing, I have no clue what I’m doing but this tutorial was very easy to follow up until the point that I got lost so thank you!

    1. Lorenz says:

      Hi, on this page is a link called “JDK Download” unter de “Oracle JDK” headline. You need to download and install this software. Hope this helps! 🙂

      1. Liam says:

        There is not link called JDK download

          1. Kat says:

            Hello! I’m stuck on this part too. Which download link is the one I need to get for Windows Java 8?

          2. Lorenz says:

            Java 8 is already a bit older. So the JDK Download for this version should be here: http://jdk.java.net/java-se-ri/8-MR3

  9. Thunder_Cube says:

    ERRM Please help it won’t work it keeps saying it what do i do?

  10. defo says:

    thankyou bro, its work 100%

  11. suresh says:

    super…thank a lot bro…..

  12. Omer says:

    It worked, thank you!

  13. Bun says:

    Thank you so much, i’t’s been a headache for weeks, I’ve even reinstall but it didn’t work, until I saw your post, it worked , thank you

    1. Lorenz says:

      You’re welcome

  14. Sohibnut says:

    Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you! Thank you!

    1. Lorenz says:

      🙂

  15. a says:

    didnt fix it

  16. AN Subramanian says:

    Thank you. It worked and saved my time. Grateful.

    1. Lorenz says:

      No problem. 🙂

    1. Lorenz says:

      Thanks

  17. Abiola says:

    Many thanks!

    1. Lorenz says:

      Gladly! 🙂

  18. Lalitha says:

    Thank you very much. It worked.

    1. Lorenz says:

      I’m glad, thanks for the feedback! 🙂

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