If you have multiple Java-Versions installed you most likely want to set a default one.
You can use the alternatives command for that.
[tux@server]$ alternatives --config java
There are 2 programs which provide 'java'.
Selection Command
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+ 1 java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.191-2.6.15.4.el7_5.x86_64/jre/bin/java)
* 2 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64/jre/bin/java)
Just enter the number of your desired default java-version and the OS will set the links accordingly.
You can now link the java-home to one of the links under /etc/alternatives. The Links in this directory will be automatically updated if you install updates.
