Is there a way to determine Java version without seeing shell output?

Question

I have a following problem.

I am executing an OS command line from within Oracle database that executes an external jar file with some parameters. I can't see shell output but I can connect with a different user to that same server through ssh/ftp and read files. There are multiple versions of Java on that server and I would like to see which one Oracle is using. Is it possible?

And before you start - no,

java -version > out.txt

does not work. It prints Java version to console and creates an empty file.

Answer 1

robert@rm:~> java -version >  out.txt 2>&1 
robert@rm:~> cat out.txt 
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) Server VM (build 14.0-b16, mixed mode)

Answer 2

That's odd, it prints the version to stderr. If the console is *nix, do this:

java -version > out.txt 2>&1

Answer 3

The version message gets printed to STDERR, not STDOUT.

If you're on linux/unix, try

java -version >& version.txt

instead

Answer 4

System.getProperty("java.version")

Answer 5

I assume the server is Unix/Linux, if so try:

java -version >out.txt 2>&1