Want to write a small message filtering application (filter incoming SMSes based on their content to a specific folder) for Nokia E51. Java seems to be the easier route.
Is it possible via Java API for Symbian series 60 phone?
If yes, what exact SDK and tools do I need?
PS: app will be for personal use.
This is not possible using Java-ME; you can't access the SMS inbox in this way.
However as your target is S60 you have the option of using native Symbian APIs, or Qt (really not too hard). Check out this link for a description of manipulating SMS with Qt.