How to compare java versions?

Asked Oct 10 '14 at 20:20

Active Oct 10 '14 at 20:33

Viewed 113 times

This code used to work fine with java 6 and 7, but running it with a jre 1.8 method getMajorJavaVersion returns 2. Is it a bug, or are we doing something wrong?

public static void validateJavaVersion() {
    // check whether the current JVM version is at least Java 6
    if (JdkVersion.getMajorJavaVersion() < JdkVersion.JAVA_16) {
        throw new APIException("OpenMRS requires Java 6, but is running under " + JdkVersion.getJavaVersion());
    }
}

getJavaVersion gives the version as 1.8.0_20

Note that JdkVersion belongs to Spring, not to the JRE itself.

Another question: is there any API to compare two java versions? Preferably native but we can use Apache commons and Spring too.

edited Oct 10 '14 at 20:33

EpicPandaForce

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asked Oct 10 '14 at 20:20

Lluis Martinez

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Is this the Spring JdkVersion class? You should include that in your tags - it's an important piece of context. I'm just guessing from having done some searches. – Jon Skeet Oct 10 '14 at 20:24
You're right, it's the Spring one. I assumed it was part of the java api. – Lluis Martinez Oct 10 '14 at 20:28
JAVA_18 should be 5. Are you **sure** you're using that JDK? – Mureinik Oct 10 '14 at 20:28
I'm sure because getJavaVersion returns 1.8.0_20 and getMajorJavaVersion 2 – Lluis Martinez Oct 10 '14 at 20:30
Getting version of java is part of the problem, but comparing two versions as strings is not trivial. – Lluis Martinez Oct 10 '14 at 20:38
This question solves my problem http://stackoverflow.com/questions/198431/how-do-you-compare-two-version-strings-in-java – Lluis Martinez Oct 10 '14 at 21:00

How to compare java versions?

0 Answers0