The JBoss release, 4.0.1, requires Java 1.4 or higher. Be sure that you have the 1.4 SDK (Software Development Kit) installed and not just the JRE (Java Runtime Environment). JBoss uses the compiler in the SDK to compile your JSP pages on the fly, among other things. To verify the version of Java you have installed, type java -version at a command prompt. Make sure that you have the SDK installed by typing javac at a command prompt. If necessary, go to Sun's web site for the latest JDK and installation instructions.
Once your Java environment is in place, you can go to the JBoss web site to download the application server. As you can see, there are a number of projects hosted at this site. Our focus is on the first one in the list, JBoss AS.
Since JBoss is written in Java, it can be run on any platform that has a working JVM. The download page has a long list of files archived in a variety of formats (.zip, .tar.gz, .bz2). The only difference between them is the utility used to bundle them up--there isn't a platform-specific JBoss distribution. Whichever one you download will work on Windows, Linux, Mac OS X, or any of the various flavors of Unix.
The current release is about 65MB, so make sure that you have a fast Internet connection or a lot of time on your hands. Don't download the source ("src") or the release candidate ("RC") bundles--look for the ones named jboss-4.0.1.*. Download one of them and unzip it to the directory of your choice. (For best results, avoid directory names with spaces in them like Program Files.) Create an environment variable called JBOSS_HOME that points to the directory.
There are no installation scripts to run. At this point, you are ready to fire up JBoss and take a look around.
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