The Dozer Plugin-feature can be installed and updated using the Eclipse Update Manager.
http://dozer.sourceforge.net/eclipse-plugin
Alternatively you can download the package at sourceforge and unzip it in your eclipse installation folder. You might have to enable the Plugin after starting Eclipse. This can be done at Help > Software Updates > Manage Configuration.
After installation is done you should see a little red dozer-icon on
all your mapping-xml files.