Is there a way to avoid undeployment memory leaks in Tomcat?

tomcat 项目部署问题 - yshy - 博客园
http://www.cnblogs.com/yshyee/p/3973293.html

jsp - tomcat - their classes from previous runs are still loaded in memory - Stack Overflow
https://stackoverflow.com/questions/10755836/tomcat-their-classes-from-previous-runs-are-still-loaded-in-memory

java - Is there a way to avoid undeployment memory leaks in Tomcat? - Stack Overflow
https://stackoverflow.com/questions/4565105/is-there-a-way-to-avoid-undeployment-memory-leaks-in-tomcat