Uninstall JAVA / JDK in Linux

Login as "root" user

Check the JAVA version

java -version

Query JDK / Java

rpm -qa | grep jdk

or 

rpm -qa | grep java

Uninstall / remove JDK / JAVA

yum -y remove jdk*

or

yum -y remove java<version name>
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How to fix: ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)

Open your terminal and type mysql -u root -p Enter your password. Hopefully your MySQL is logged in now.