What's wrong with me?

Today, I want to learn struts2. I have learned something before. I think I can do it. The basic operations are almost the same. It's just a little advanced. I haven't compiled it for weeks.ProgramIt may be a bit unfamiliar. For more than an hour, I am debugging a simple small test program in struts2. How much can I do in an hour !! After searching for the last half a day, I really don't know where I went wrong. I checked the configuration file, Web. XML, and found that I was nearly fainted when I didn't write the strust2 interceptor. This problem really cannot be solved. It's better to be careful when you are just learning it. Basically, this low-level error won't happen. But who can blame? Just blame yourself for being careless. Be careful in the future. There are too many things to do. You can't jump across the gutter !!