Java is one of the oldest and most prominent languages in the world. It doesn’t matter whether you are a beginner or a professional, you would need to run some Java codes.

Whether your run Jenkins in Windows or a Linux distro like Ubuntu or Red Hat, the Java command used to run the Jenkins war file is always the same: java -jar jenkins.war Note that the -jar switch is ...

Step 2. Start Tomcat If you installed Tomcat as a service, it is already running. Otherwise, go ahead and start it up by entering ./catalina.sh start at the command line.

There are a couple of ways to find out if you have Java installed and what version may be running. Windows users can click Start, then Run, then type “cmd” without the quotes.