Lots of great features and an uncluttered interface. Very stable.
Project organisation
Syntax formatting
Error and Exception indicatin in source code
Auto-format
Create skeleton class sets for applets, GUI and console applications ...
Java Server Pages (JSP) could handle any erros that might be arised in scriptlets, expressions, or other JSP elements. You could use try/cacth blocks to handle any known erros. In this technic we could use to display a custom error on our file where ...