LAMP How To – Open Source At Work

Characters like “<” and “&” are illegal in XML elements. “<” will generate an error because the parser interprets it as the start of a new element. “&” will generate an error because the parser interprets it as the start of an character entity. Some text, like JavaScript code, contains a lot of “<” or [...]

If you are behind a proxy server, you may get annoying proxy popups after installing eclipse. The trick is to manually setup the proxies in
windows->preferences->general->networking
This works for galileo, the version that I am using.