Eclipse: How do I add the javax.servlet package to a project? [duplicate]

To expound on darioo’s answer with a concrete example. Tomcat 7 installed using homebrew on OS X, using Eclipse:

1. Right click your project folder, select Properties at the bottom of the context menu.
2. Select “Java Build Path”
3. Click Libraries” tab
4. Click “Add Library…” button on right (about halfway down)
5. Select “Server Runtime” click “Next”
6. Select your Tomcat version from the list
7. Click Finish

What? No Tomcat version is listed even though you have it installed via homebrew??

1. Switch to the Java EE perspective (top right)
2. In the “Window” menu select “Show View” -> “Servers”
3. In the Servers tab (typically at bottom) right click and select “New > Server”
4. Add the path to the homebrew tomcat installation in the dialog/wizard (something like: /usr/local/Cellar/tomcat/7.0.14/libexec)