How do I check a clients Java Version?

Question

I want to create an Executable Jar file that when run, checks the currently installed version of Java on that computer and displays it for the user. I have searched online but in vain, I cannot find any code that allows a Jar file to check. I know that the Java website has it ( http://www.java.com/en/download/installed.jsp) I can't find a way to replicate it in Java Code. Any help would be very much appreciated.

Note: Sorry if this question is really stupid and has a really simple answer... I just spent half an hour trying to find a solution and I couldn't so I need your help! Thanks

Edit: I don't need the code for displaying it, just to get the version is enough for me thanks!

http://stackoverflow.com/questions/5103121/how-to-find-the-jvm-version-from-a-java-program also, if you're targeting Windows try this -> http://launch4j.sourceforge.net/ you can bundle the JVM with it if it is critical or just throw an error message. — Daniel B. Chapman, Oct 29 '13 at 18:17
possible duplicate of [Getting version of java in runtime](http://stackoverflow.com/questions/2591083/getting-version-of-java-in-runtime) — Darwind, Oct 29 '13 at 18:18

score 5 · Accepted Answer · answered Oct 29 '13 at 18:17

5

System.getProperty("java.version");

answered Oct 29 '13 at 18:17

Kal

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Wow so it was so simple, thanks! But I feel really stupid now! – XQEWR Oct 29 '13 at 18:23

Petr Mensik · Answer 2 · 2013-10-29T18:28:51.807

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Calling System.getProperty("java.version"); will give you version of the installed JRE which is what you want. Also take a look at other System properties, you may find some of them also useful.

edited Oct 29 '13 at 18:28

answered Oct 29 '13 at 18:18

Petr Mensik

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How do I check a clients Java Version?

2 Answers2