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user212051
Asked: 2017-05-29 03:40:24 +0800 CST

JAVA_HOME versus java -version

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I've two JDK's on my CentOS machine, 1.7 and 1.8.

When I set my JAVA_HOME to 1.7 the java -version command still shows 1.8

What's this? And how to fix?

centos

3 Answers

  1. It depends on how you run java. If you run java -version without specifying any path, the first java executable found in $PATH environment variable is used. This has nothing to do with JAVA_HOME var.

    If you want to change the java executable you are using based on changing the JAVA_HOME var, you can run it:

    $JAVA_HOME/bin/java -version
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  2. Did you also remember to change the location of the Java binaries in your path (environment)? You will still need to edit your

    .bash_profile:

    export JAVA_HOME=/usr/local/jdk1.7_92

    or

    /etc/environment:

    JAVA_HOME=/usr/local/jdk1.7_92 export JAVA_HOME

    (whichever way Centos supports setting the path at login) to point to the JDK (or JRE) you want to run.

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  3. Usually a java symbolic link is put under /usr/bin directory for java. You can see that by issuing "which java" command. You can try to change it if you have a root password, if you can't you may try to call java binary directly, like;

    /home/myhome/jdk7/bin/java -version

    IMO that should do the work.

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