Check java version:

Try this to check the version:

    javac -version           java -version

For javac, if you aren't on 1.5, the -version won't work.
You can use

    javac -J-version

in any version

That will cause javac to pass -version when it invokes java, which will tell you the VM version, but not the javac version.
The two will usually be in sync, though--I'm just being a pedantic ballsniffer.