Windows ignores JAVA_HOME: how to set JDK as default?

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On Windows, the same java executable can load DLLs for different versions of Java. It looks at the directory from which it’s running to see if it contains libraries for a particular version of Java. If not, it uses the Windows Registry to locate the default version of Java for the system.

The Java installer will put a copy of java.exe (but no libraries) in the the Windows\system32 C:\Program Files (x86)\Common Files\Oracle\Java\javapath directory, and add that directory to the beginning of the PATH variable.

If you don’t use a full path, the copy of java.exe to run is found by using the PATH system variable. Since this directory doesn’t contain the DLLs of a particular Java runtime version, one is located one by looking at the registry.

So, you either need to modify the registry, or replace the javapath entry with the version of Java you want in your PATH system (not user) variable.

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