Tips of Eclipse

1. Windows-->Preferences-->General-->Editors-->Text Editors
   a. Insert spaces for tabs
   b. Show line numbers
2. Windows-->Preferences-->Java-->Code Style-->Formatter
   a. Set up how to automatically modify the codes.
3. When you generate a jsp file, remember setting up encoding method in page directive or you can't save what you modify in the file in that encoding. ( Eclipse will generate Encoding Error!)
4. (Any project) Properties-->Java Compiler-->Building: Output folder can set up what kinds of files you want to copy to the output folder!!