Install Java manually on Linux: 
It is easy to use your Linux distribution’s package management tool to install the Java software packages. However, sometimes you need to do a manual installation of Java. This is of particular importance to administrators of Java-based application servers such as Tomcat or JBoss. Many open source and proprietary software products rely on these services.
Developer or Runtime kit?
The Java Virtual Machine (JVM) is provided in two different forms: The Java Development Kit (JDK) or the Java Runtime Environment (JRE).
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