The most common cause of the JNI error while trying to set up a Minecraft server is due to the Java version installed on the machine being outdated.

We explain how to fix Java Virtual Machine Launcher Error, Could not create the Java Virtual Machine on Windows 11/10 computers.

<tl;dr> To fix the Eclipse “No Java virtual machine was found” error, simply edit the eclipse-inst.ini file and add the -vm flag, which points it to the java utility in the JDK bin directory: ...

The Java virtual machine manages application memory and provides a portable execution environment for Java-based applications.