How to use the alternatives command to switch between OpenJDK and Oracle Hotspot Java

## Assuming we have both java packages installed in the server

## Before Switch, confirm the version of java [root@rhel7server1 java]# which java /usr/bin/java [root@rhel7server1 java]# java -version openjdk version "1.8.0_292" OpenJDK Runtime Environment (build 1.8.0_292-b10) OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode) ## run altertives command (binary is located at /sbin/alternatives) [root@rhel7server1 java]# alternatives --config java There are 3 programs which provide 'java'. Selection Command ----------------------------------------------- 1 java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.261-2.6.22.2.el7_8.x86_64/jre/bin/java) *+ 2 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.x86_64/jre/bin/java) 3 /usr/java/jdk1.8.0_281-amd64/bin/java Enter to keep the current selection[+], or type selection number: 3 ## Confirm the java version after the switch [root@rhel7server1 java]# java -version java version "1.8.0_281" Java(TM) SE Runtime Environment (build 1.8.0_281-b31)Java HotSpot(TM) 64-Bit Server VM (build 25.281-b31, mixed mode)