proxool 连接池警告分析：appears to have started a thread named [HouseKeeper] but has failed to stop it

1. 问题：日志中出现下面的警告：

警告: The web application [ROOT] appears to have started a thread named [HouseKeeper] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:警告: The web application