Q10: How can I find out which Java ES components are installed on my host?

Answer: One way to identify what Java ES components are on the host is to perform a test installation using the installer -no command. The installer indicates the incompatible and upgradable components that are on the host. For guidelines on how to survey your hosts before doing an installation, refer to instructions for identifying incompatible components in When Incompatible Components Are Installed in Sun Java Enterprise System 5 Installation Guide for UNIX.

Another way to survey the software on a host is to examine the product registry. See Q40: What is the product registry and why should I care about it?

You can also view the installed packages using the following UNIX package display commands to see if any Java ES component packages are present. For a list of packages, see Chapter 5, List of Installable Packages, in Sun Java Enterprise System 5 Installation Reference for UNIX. Use the following commands to view packages:

• Solaris OS: pkginfo

• Linux: rpm -qa

• HP-UX: swlist