MaheshVarma MaheshVarma - 1 month ago 4x
Java Question

How Does Eclipse find the JRE or JDK locaton?

According to the Eclipse FAQ. I read that

Eclipse DOES NOT consult the JAVA_HOME environment variable.

My doubt is how does eclipse initializes the
Virtual Machine
. It does not know the location of
. My
file does not have
configuration. Still I am able to run eclipse.

The Source


According to Eclipse Installation Guide.
Eclipse does not write entries to the Windows registry


As far as I know, to invoke the JVM, Eclipse executes the java command, so, if it's at your system execution path, Eclipse won't need to find the instalation directory.

To check, you can start a OS shell and execute the next command (from any location):

> java -version

EDIT: I was (partially) wrong. From the FAQ (

If a JVM is installed in the eclipse/jre directory, Eclipse will use it; otherwise the launcher will consult the eclipse.ini file and the system path variable

So, Eclipse first looks inside its eclipse/jre dir for installed VMs, if empty, consults the eclipse.ini file, and at last, looks at the system path.