Determine java version used to call a program

Question

I'm trying to determine inside an application what is the Java version used to call a JAR.

I saw some solutions talking about System.getProperty(java.version), but what if the user have different versions of Java, and the command is like this:

C:\Absolute\Path\To\Java\1.5\java -jar something.jar

Is there any way to know the real Java version?

actually, "System.getProperty(java.version)" should return the version of the executing java VM. Have you tested it? — Chris K., Apr 22 '15 at 13:24
Do you want to get the java version from inside your `something.jar` ? — Jonas Czech, Apr 22 '15 at 13:24

score 3 · Answer 1 · answered Apr 22 '15 at 13:24

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System.getProperty("java.version") will always give you what version of java is currently running the code that called that statement, no matter how many different versions of java exist on the system.

answered Apr 22 '15 at 13:24

MadConan

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score 2 · Accepted Answer · edited May 23 '17 at 12:29

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You should use System.getProperty("java.version"). This will give you the version of the currently running JVM as a String, And you can then check for a prefix like 1.5 or 1.6, and you have the version of Java.

Also check this question, and the docs for System.getProperty(...).

Hope this helps.

edited May 23 '17 at 12:29

Community

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answered Apr 22 '15 at 13:28

Jonas Czech

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score 0 · Answer 3 · answered Apr 22 '15 at 13:26

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System.getProperty("java.version")

answered Apr 22 '15 at 13:26

Waqar

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Determine java version used to call a program

3 Answers3