Hi,
jboss is written in Java. So, you just need a JVM.

The only additional requirement to run JBoss is to have an up-to-date version of Java on your machine. JBoss 4.0 requires at least JDK 1.4 to run. Make sure to get the JDK and not the JRE. Although JBoss will startup with the JRE only, you'll experience problems compiling JSPs with it. You should also make sure the JAVA_HOME environment variable is set to point to your JDK installation.

(from "JBoss Getting Started Guide 4.0")

On the other hand, it depends on your configuration ...

Emmanuel Lorge