Although the steps are similar, the details of installing Eclipse depend on the operating system.
Go to the Eclipse download site (http://www.eclipse.org/downloads) and download the variant appropriate to the operating system of the Eclipse IDE for Java EE Developers (based on Eclipse 3.4.2).
Unzip the download of Eclipse to the root directory of a drive (this will avoid possible problems with long pathnames).
cd C:\
"%JAVA_HOME%"\bin\jar xf \path\to\eclipse-jee-ganymede-SR2-win32.zip
To verify the installation, run the eclipse.exe executable in the unzipped directory
and check that Eclipse displays a welcome panel.
Unpack the download of Eclipse to a suitable location on the file system, such
as /opt or, if root access is not available, the home directory.
(If the download was automatically unpacked by the operating
system, simply move the unpacked directory to the chosen location.)
To verify the installation, run the Eclipse executable (Eclipse.app on Mac OS X)
in the unpacked directory
and check that Eclipse displays a welcome panel.