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 Java. My eclipse.ini file does not have -vm configuration. Still I am able to run eclipse.

UPDATE

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

解决方案

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

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.