Which JRE am I using?

Question

There are two varieties of JRE available. Java VM: IBM vs. Sun.

Is there a way to know which JRE I am using through JavaScript or some Java issued command.

Answer 1

I had a problem where my Java applications quit work with no discernible evidence that I could find. It turned out my system started using the 64-bit version rather than the 32-bit version was needed (Windows Server 2012). In Windows, the command:

Javaw -version

just brought me back to the command prompt without any information. It wasn't until I tried

Javaw -Version 2>x.txt
type x.txt

that it gave me what was being executed was the 64-bit version. It boiled down to my PATH environment variable finding the 64-bit version first.