How to execute a shell command from Java using Runtime.getRuntime().exec() method.

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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

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

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

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How to marshal a JAXB object into org.w3c.dom.Document using Transformer class and formatted console print.

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How to setup a proxy with authentication for HTTP client in Golang example using http.Transport and http.Client. Simple example calling httpbin.org test server.

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