Baidu to find a lot of information there that use project-> build automatically, it is said, using clean, or not, has not compiled class files, endless wonder.
Then also try other ways to compile class files, or not. That's when I saw an article that might class file is being used, can not be recompiled, so I think my scheduled tasks (cron job) is open JAVA script, use is compiled class files, then stop the script run , and then re-clean compile, success!
