If I have already developed a complex framework for a portal using Struts 1.2.4 and tiles, how do I decide whether I need to move on to new version i.e Struts2. We have used TileController from Advanced Tiles concepts.
A good way to approach this decision is to analyze the current application in terms of usage, maintenance, performance, etc. Ask the following questions for example.
1. Are the users experiencing any problems with the application and can Struts 2 help in any way?
2. Are there any performance problems with the application and can they be solved by moving to Struts 2?
If you cannot identify any non-technical reason that suggests improvement from moving to Struts 2, then you most likely should not convert the application.