How do I find the "Preferences" menu in Eclipse in OS X?

For Spring-Tool-Suite also it is same as Eclipse in MacOS.

Preferences is under the Eclipse menu on Mac OS X (contrary to Windows / Linux where its in the Window menu).

Go to "Eclipse" on menu bar an then select "Preferences", or just key in CMD+,

In OS X you can generally get to the preferences using Command + , (works for me with Eclipse on Snow Leopard).