"Java is a programming language originally developed by Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of computer architecture." — Wikipedia:Java (programming language)
There are two Java Virtual Machines in the Arch repositories that can be installed on your system — the OpenJDK open source implementation and Sun's closed source implementation. Arch recommends OpenJDK.. Additional Java implementations are available via the AUR.
To be able to run Java programs, you can install OpenJDK from the repositories. This also installs a Java Development Kit.
# pacman -Syu openjdk6
You will likely need the Template:Package Official package for Java functionality in Firefox as suggested in this thread: https://bbs.archlinux.org/viewtopic.php?pid=895343
# pacman -S icedtea-web
Prior to the retirement of the Oracle DLJ, it was possible to simply install the jre and jdk packages from the repositories, respectively. However, now Arch Linux (and any other GNU/Linux distribution) can no longer package the Oracle implementation of Java. The OpenJDK packages are the recommended providers of java-runtime and java-environment.
Kaffe is another clean-room implementation of a Java VM without official endorsement from Sun/Oracle. A git package of Kaffe can be found in the AUR. The Kaffe VM is redistributed according to the GPL license.
BEA JRockit JIT JVM (+JDK)
VMkit LLVM-based JIT VM
VMkit is an LLVM-based framework for JIT virtual machines. J3 is a JVM running on VMkit. A broken build for VMkit can be found in the AUR. J3 depends on the GNU classpath libraries, but may also work with the Apache class path libraries.
Java sound with Pulseaudio
By default, Java and Pulseaudio do not get along very well with each other, but this is easy to fix using padsp.
(These paths are correct for Sun's Java, you will need to change the paths for OpenJDK)
# mv /opt/java/jre/bin/java /opt/java/jre/bin/java.bin
Then, create a new launcher script at Template:Filename
#!/bin/sh padsp /opt/java/jre/bin/java.bin "$@"
Finally, make the launcher script executable
# chmod +x /opt/java/jre/bin/java
You will need to redo this process on each update of Java.
You can also try replacing padsp with aoss, which can also fix it under standard ALSA as well as in Pulse, do what works best. I must warn everyone that these hacks sometimes work perfect, but are sometimes very unstable as well.
Due to the fact that the JDBC-drivers often use the port in the URL to establish a connection to the database, it is considered "remote" (i.e., MySQL does not listen to the port as per its default settings) despite the fact that they are possibly running on the same host, Thus, to use JDBC and MySQL, you need to edit Template:Filename and comment out the line looking like this: