"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 Oracle's (previously 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 official repositories. This also installs a Java Development Kit.from the
You will likely need the https://bbs.archlinux.org/viewtopic.php?pid=895343package for Java functionality in Firefox as suggested in this thread:
Prior to the retirement of the Oracle DLJ, it was possible to simply install the Template:Codeline and Template:Codeline packages from the repositories. 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 Template:Codeline and Template:Codeline.
The AUR contains packages for AUR and AUR, the Oracle implementations of Java.
Apache Harmony is a clean room re-implementation of the Java language and comes under the Free Apache license. A binary re-distribution of the Harmony JRE can be found in the AUR: AUR.
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 here: AUR. The Kaffe VM is redistributed according to the GPL license.
BEA JRockit JIT JVM (+JDK)
The JIT version of Java is available from the AUR here: AUR.
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 here: 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:
If your java programs look ugly, you may want to set up the default look and feel for the swing components. From this forum post, a way to do it consists of adding the following line in your Template:Filename (or Template:Filename to affect all users)
export _JAVA_OPTIONS="-Dawt.useSystemAAFontSettings=on -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel"