Is the output of java -version reliable?

Hi,
As part of an installer, I'm trying to write a script to check that the user's JRE is recent enough. With all JRE's I tried I noticed that the first line of output from: java -version is always of the form: java version "1.3.1" Can I rely on this to always be the case? I had a look through some of the specifications, but they are more concerned with how the JRE runs, not how you invoke it.
Cheers,
Gary

I think it's best to get the system property "java.version" and to check upon the result.
System.getProperty("java.version");

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