Changing OpenJDK8 to OpenJDK11 on CentOS7

Description

I changed java environment from OpenJDK8 to OpenJDK11 and wrote the procedure to do it in here.

The reason I changed OpenJDK version is simply I think OpenJDK8 is a little old and OpenJDK11 is better for me in the future.

Step1 : Checking the existing java version

java -version

openjdk version “1.8.0_262”
OpenJDK Runtime Environment (build 1.8.0_262-b10)
OpenJDK 64-Bit Server VM (build 25.262-b10, mixed mode)

Step2 : Removing existing OpenJDK8

We can remove the existing OpenJDK8 environment with “yum remove” command. It’s good way to use wild-card to clean it fully.

sudo yum -y remove java-1.8.0-openjdk*

Checking the version again after executing removing.

java -version

-bash : /usr/bin/java: No such file or directory

It seemed completed successfully.

Step3 : Installing OpenJDK11

We already removed OpendJDK8, so we begin to install OpenJDK11.

We can also install with yum command as follows.

sudo yum install java-11-openjdk

If runtime environment is enough for your purpose as above. But if you want to use Java as developing, you have to use commands as following.

sudo yum install java-11-openjdk-devel

You can select yes or no during installing, please answer them.

After finishing install of the OpenJDK11, you should check the version again.

java -version

openjdk version “11.0.17” 2022-10-18 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.17.0.8-2.el7_9) (build 11.0.17+8-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.17.0.8-2.el7_9) (build 11.0.17+8-LTS, mixed mode, sharing)

Installing was completed successfully.

Summary

The procedure to change OpenJDK from 8 to 11.

• Removing OpenJDK8
• After then installing OpenJDK11 with yum command.