Install and use firewalld on Ubuntu
Firewalld is one of the Linux firewall management tool and it is available on the in the Ubuntu's default repositories, therefore it is available to
be installed from these repositories using the apt packaging system.
How to change Tomcat default port
How to change Tomcat default port 8080 to any other port. Three steps: locate server.xml file, edit and restart the Tomcat service.
How to configure Tomcat with Eclipse
How to configure Tomcat with Eclipse. Simple steps to configure Tomcat working within Eclipse IDE.
How to send emails using JavaMail
How to send emails using JavaMail. Simple example using a gmail account and proxy settings if needed.
Split URL into components using regex
Split URL into components (protocol, domain, port and uri) using regex in Java. Simple and tested example.
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