I then open up my own modified simple tile map editor, place the entity in a map, I then test the Entity in game by loading the map. Personally for my own Entity Editor, I just use simple Java Frame with a text area to output its stats and and JButtons for its settings changes. If it is for distribution purposes, then just create your own simple input dialog GUI components to run in your application at least temporarily. That said, if the Entity Editor is for personal use, then just use LWJGL 2. So your code will not be portable (at least with the current version). LWJG元 and Mac will cause a crash if you try to use AWT Components. The approach of taking the frame buffer and putting it into a BufferedImage is problematic.