How to generate UUID / GUID in Java using java.util.UUID class, UUID.randomUUID() method.

How to change hostname in Ubuntu. There are three options: temporary until the first restart and permanent by changing the hostname file or using command hostnamectl

How to change Tomcat default port 8080 to any other port. Three steps: locate server.xml file, edit and restart the Tomcat service.

Maven local repository default location for Linux and Windows and how to change the location.

How to read XML file in Java using SAX Parser.

How to activate the default tomcat manager application administrator password. This setting is for Tomcat 7 and newer.