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JNI Error when starting a Minecraft Server If this works, it is probably due to the JDK and JRE versions in Eclipse. Then you can run the file manually with java Main. If the problem is not fixed I navigate to your Eclipse workspace and compile your main file manually in the Windows CMD using the following command: javac Main.java. Try to rename your package – this can be the simple solution. Maybe you have named one of your packages identically to a Java internal package (e.g. But first see if it might be a simpler problem: In Eclipse the problem can also be the JDK and JRE version.

Now you have to close and reopen the Windows-CMD once and the error should be fixed.

Select the line with the Java JDK and click on “Move up” until the entry is at the top.

If you do not have this entry, you can add it by clicking the “New” button.

exe installation file (“圆4 Installer”) here. If you don’t have a Java JDK installed yet, you can download and install the. In my case this is under C:\Program Files\Java\jdk-13.0.1\bin.

There you look for the line where the installation path of your Java JDK is stored.

There you select the variable “Path” in the lower window “System variables” and click on “Edit…”.

The “Environment variables” window opens.

In this window you click on “Environment variables…”.

To do this, type “environment variable” in your Windows search and open the “Edit System Environment Variables” item.

To fix the error, you need to adjust the environment variables for Java. via the command java -jar File.jar or if you have compiled your program with Eclipse before. jar file via command line (Windows CMD), e.g. The problem can occur if you want to call a.

Just choose the scenario that applies to you: Now there are several possible solutions for you. 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. Java Virtual Machine Launcher: JNI Error Popup