nested exception is: java.sql.SQLException: null, message from server: "Can't create a new thread (errno 12); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug"以前mysql报上面这个错误，然后我把数据库的max_connections设成了2000；现在还是报这个错.....请各位施主随意涂鸦。
wait_timeout=40