The J2SDK package contains Sun's Java development environment. This is useful for developing Java programs and provides the runtime environment necessary to run Java programs. It also includes a plug-in for browsers so that they can be Java aware. The JDK comes in two flavors, a precompiled binary and a source package. Previously, the plugin included in the JDK binary package was unusable on LFS owing to incompatibilities with GCC-3 compiled browsers. This is not the case anymore. The source package requires registration at the Sun developer site and accepting the Sun Community Source License. The source code cannot be downloaded from some countries, so for users from those countries, the binary may be the only option. Even if you plan on compiling the JDK source, you will need to download the binary version to bootstrap the JDK build. Follow the below link to download both source and binary packages. When downloading the source also download the Mozilla headers package available at the same location. Download (HTTP): Download (FTP): Version used (binary): &j2sdk-bin-version; Download size (binary): &j2sdk-bin-size; Download size (source): &j2sdk-src-size; Estimated Disk space required: &j2sdk-src-buildsize; Estimated build time: &j2sdk-time; , , , , and