Add Java to system PATH variable

 This method seems to work best for me;

There is a script /etc/profile that sets up environment variables and that also includes any scripts in /etc/profile.d so I chose to create a file /etc/profile.d/java.sh with 755 permissions with the following contents;

export JAVA_HOME="/opt/jdk1.8.0_341"
export PATH=$JAVA_HOME/bin:$PATH