How do I set up my execution environment for ESC/Java2 in WindowsXP? And furthermore, how do I build and run, in WindowsXP, projects with ESC/Java2. It is hard to tell from their specifications/readme and documentation, specially considering the fact that they seem to be talking more about Unix based operating systems.
You can use Eclipse Europa (3.3) (or higher, at your own risk...most plugins are upwards-compatibile) and its associated Eclipse Plugin.
To install a plugin, go to help->Software Updates->Find and Install, then add a new remote site from the plugin's update site. You can then select the plugin to install, and click through the "ok" prompts. Restart Eclipse and it should be installed then.