I've added OpenJDK (Java Development Kit) and OpenJRE (Java Runtime Environment)
packages. Thanks to Eric Hameleers.

• patches/packages/openjdk-7u9_b30-arm-1_slack14.0.txz
  The Java Development Kit. If you want to develop in Java, this package plus
  'rhino' (below) will suit your needs.
• patches/packages/openjre-7u9_b30-arm-1_slack14.0.txz
  The Java Runtime Environment. Unless you're developing Java code, this package
  will plus 'rhino' (below) suffice to run Java binaries.
• patches/packages/icedtea-web-20120225-arm-1_slack14.0.txz
  This is a web browser plugin to enable the execution of Java Applets.
• patches/packages/rhino-1_7R3-noarch-1_slack14.0.txz
  This is a run-time dependency for OpenJDK/OpenJRE.