严重：The web application [web01] appears to have started a thread named ...

Tomcat报错

严重：The web application [web01] appears to have started a thread named [PooledThread-1] but has failed to stop it. This is very likely to create a memory leak.

没有关闭ResultSet，PreparedStatement，Connection的后果。用完ResultSet，PreparedStatement，Connection对象后一定要关闭，不然占用很多内存。