Scala Error a Jni Error Has Occurred Please Check Your Installation and Try Again

Some Minecraft users are seeing an error whenever they attempt to launch the client (the game) or the server (.jar). The error message that comes up is: "A JNI error has occurred, please cheque your installation and effort again". This problem is more often than not reported to occur with version Minecraft version 21w19a and newer and it's confirmed to appear on Windows seven, Windows eight.one, Windows x, and Windows 11.

As it turns out, there are multiple causes that might trigger this error when certain users endeavor to launch Minecraft and almost each of them is related to the Coffee installation.

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 attempt once more":

Java 16 JDK is missing – If you get this fault while attempting to launch Minecraft build 21w19 or newer, the commencement thing you lot should do is check if the Coffee 16 JDK installation is missing from your PC. This is the near popular reason why this error is encountered when launching Minecraft on PC. If the Java xvi JDK is missing from your computer installation, download and install information technology from the official channels.
Cleaved Arrangement Path for Java – Every bit it turns out, some other reason why yous can expect to see this error is a scenario in which the arrangement variable path for java is broken and tricks the Minecraft launcher into believing that Coffee is non installed on your PC when it actually is. If this scenario is applicable, y'all should be able to set the issue by removing the cleaved system PATH variable from the Environment variables.

Install the latest Coffee JDK version

In most documented cases, this particular error happens when yous endeavour 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 accept Java'southward sixteen JDK version installed on your PC, otherwise, the game will not launch.

To fix this result, y'all will simply need to update your current Java JDK to the most recent version available using the official channels.

If you're looking for step by step instructions on how to exercise this, follow the guide below:

Ensure that the Minecraft launcher (Tlauncher or whatsoever other) is completely closed earlier moving to the adjacent step below.
Open your default browser and visit the download page of the Java 15 Development kit.
Once you lot're within, brand sure the Windows tab is selected, then scroll all the way down to the Windows x64 Compressed archive and click on the associate Download hyperlink.

Downloading the x65 compressed archive of the Java xvi JDK
At the confirmation prompt, bank check the box associated with I reviewed and have the Oracle Technology Network License Agreement for Oracle Java SE, then click on the Download push button below.
Look until the download is consummate, then unpack the zip archive with WinZip, WinRar, 7Zip or the built-in equivalent and wait for the operation to complete.

Unzip the Java JDK
Once the extraction procedure is complete, navigate to the location where you extracted the JDK and copy information technology on your clipboard past right-clicking on it and choosing Copy from the context menu.
Next, use File Explorer (My Calculator) to navigate to the following location and paste the JDK 16 folder that you lot previously copied:
```
C:\Plan Files\Java
```
Wait until the copying performance is complete, then close the window and double-click on your Minecraft launcher again (TLauncher or other).
In one case you're inside the launcher, click on the settings icon, then click on Settings from the context card.

Accessing the Settings menu of the Minecraft launcher
Inside the Settings carte, ensure that the Minecraft Settings is selected at the peak, then click the Scan button associated with Java path.
Next, use the scan window to navigate to the following location:
```
C:\Plan Files\Java\jdk-16.0.two\bin
```
Once inside, make sure that javaw.exe is selected before clicking the Open up button.
Finally, click on the Save push button to successfully save the java path in your Minecraft launcher.
Launch the game commonly and you should see the event fixed.

If the trouble is still non resolved, move down to the adjacent potential set up beneath.

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 cleaved variable can be the determining factor in 'tricking' your Minecraft launcher into assertive that the Coffee JDK requirement for the game is not installed when information technology actually is.

In this case, you lot can get the result resolved past accessing the Arrangement Properties screen and modifying the Environment variables in a way that the Java PATH environs is removed.

This fix has been confirmed to exist effective for a lot of Minecraft users that nosotros're encountering the "A JNI mistake has occurred, please cheque your installation and try once again" when attempting to launch the game from a dedicated launcher.

Follow the instructions below for a pace-by-stride guide that will guide you through the process of removing the corrupted Java JDK path variable:

Notation: The instructions below should work on every contempo Windows version including Windows 7, Windows eight.1, Windows 10, and Windows 11.

Press Windows key + R to open upwards a Run dialog box. Next, type 'sysdm.cpl' inside the text box and press Enter to open upwards the System Properties window.

Open the Organization Properties window

Notation: If you are prompted past the User Account Command prompt, click Yes to grant admin access.
One time you're finally inside the System Properties window, click on the Advanced tab, and then click on Environment variables(nether Startup and Recovery).

Open upward Organisation Variables card
Once y'all're within the Organisation Variables window, get to System Variables, and so choose Path and click on Edit.

Editing the path variable
Adjacent, in one case you're inside the Edit environment variable window, go ahead and look for an environment variable that mentions java.
Once you spot the culprit, click on it one time to select information technology, and then click Delete to get rid of it.

Deleting the coffee environs variable
Once the problematic surroundings variable has been deleted, reboot your PC, then start Minecraft again and see if the "A JNI mistake has occurred, delight check your installation and try again" issue is now fixed.