Editing Tutorials/Setting up a server (section)

== Java ==

[[Wikipedia:Java (programming language)|Java]] is a programming language designed to create programs for the [[Wikipedia:Java virtual machine|Java Virtual Machine]] (JVM). The JVM supports many different platforms. By doing this, developers write code for the JVM and any platform supported by the JVM can run the program. [https://www.javaworld.com/article/3272244/what-is-the-jvm-introducing-the-java-virtual-machine.html Further reading.(Remote shell port)]

This section is designed to answer some frequently asked questions about Java and guide you through some decisions regarding Java.

==== OpenJDK vs OracleJDK ====

OpenJDK and OracleJDK are very similar. OpenJDK is the official open source [[Wikipedia:Reference implementation|reference implementation]] of Java. OpenJDK is an open source codebase that almost all other JDKs are built on. Excluding packaging, cosmetic and license differences [https://www.oracle.com/technetwork/java/javase/overview/oracle-jdk-faqs.html OpenJDK is the same as OracleJDK].

Do note that OracleJDK (Oracle's "OTN") builds require a paid subscription for [https://www.carehart.org/blog/client/index.cfm/2019/1/1/how_oracles_java_change_applies_to_any_production_use commercial and production] purposes. This likely includes running a ''Minecraft'' server even if it is non-profit. Oracle does provide its own OpenJDK builds, but they are not packed into an installer format for easy use.

==== JRE vs JDK ====

JRE stand for [https://www.javaworld.com/article/3304858/what-is-the-jre-introduction-to-the-java-runtime-environment.html '''J'''ava '''R'''untime '''E'''nvironment]. JDK stands for [https://www.javaworld.com/article/3296360/what-is-the-jdk-introduction-to-the-java-development-kit.html '''J'''ava '''D'''evelopment '''K'''it]. JRE is a package tool designed to ''run'' Java programs. JDK is a package of tools designed to ''develop'' Java programs. The JDK comes with the JRE which comes with the [https://www.javaworld.com/article/3272244/what-is-the-jvm-introducing-the-java-virtual-machine.html JVM]. If you have JDK then you have JRE and JVM. Vanilla ''Minecraft'' does not need JDK, but plugins may require it.

==== Headless Java ====

A headless Java installation is a trimmed down version of Java. It does not have a GUI or mouse/keyboard support. Headless Java is frequently used in Servers or other environments where a GUI is not needed.
{{Quote|There are several virtual packages used in Debian for Java. These cover runtime compatibility and come in two flavors; headless (omits graphical interfaces) and normal.|[https://wiki.debian.org/Java/ Debian Wiki]}}