现在的情况是，我要替换class文件，替换完 重启tomcat时，报错，错误是：
this web application instance has been stopped already。could not load com。sybase。jdbc3.jdbcErrorMessage
The eventual following stack trace is has no functional impct。
。。appears has started a thread named【worker-9】 but has failed to stop it。thi
is very likely to create a memory leak
