How to uninstall jdk on centos

Centos7 usually comes with its own openjdk. We usually use Oracle's jdk, so we need to uninstall it.

Step 1: Check whether the system has installed jdk

#rpm -qa|grep java

or

#rpm -qa|grep jdk

or (recommended tutorial: centos usage tutorial)

#rpm -qa|grep gcj

Step 2: Uninstall the installed jdk

#rpm -e --nodeps java-1.8.0-openjdk-1.8.0.131-11.b12.el7.x86_64
#rpm -e --nodeps java-1.7.0-openjdk-1.7.0.141-2.6.10.5.el7.x86_64
#rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.131-11.b12.el7.x86_64
#rpm -e --nodeps java-1.7.0-openjdk-headless-1.8.0.131-11.b12.el7.x86_64

Step 3: Verify that there is still jdk

#rpm -qa|grep java
#java -version

There is no content to prove that it has been uninstalled cleanly.

Related video tutorial sharing: linux video tutorial

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