We assume that you are somewhat familiar with the Java language, and have a Java programming environment installed on your computer. We recommend an environment compatible with Sun J2SE 1.4 (java.sun.com), although it should be possible to get by with 1.3 compatibility.
You will need to be able to create and edit a Java source program using a standard text editor of your choice, to compile it with the command javac, and to run it with the command java. Currently there is no GUI-based Integrated Development Environment for HPJava--the tools are command-based. This kind of environment will be familiar to most developers who work with Linux or UNIX operating systems. hpjdk can be used directly under Microsoft Windows in a command prompt window. However if you are working under Windows you may well want to install a UNIX-like command shell such as Cygwin (www.cygwin.com) before proceeding. Certainly if you are planning to rebuild parts of hpjdk from source, Cygwin or equivalent is likely to be very valuable.
To install HPJava, visit our Web site (www.hpjava.org) and download the archive file hpjdk-1.0.zip or the archive file hpjdk-1.0.tar.gz. The two archives have the same content; choose one or the other depending on what extraction tools you have available, or possibly on bandwidth considerations--the .tar.gz version is typically much smaller.