Ghost Java Processes while Running Tomcat

[Gonçalo Gaiolas]

Hi everyone,
 
I have Tomcat deployed in a production environment, and after a while I get
OutOfMemory Exceptions. I realize this may be a memory leak in my
application, but what troubles me the most is that if I execute a ps I can
see a lot of java processes that simply don?t die after tomcat has been
shutdown. I have to kill them manually.
 
What could be wrong here? I am using tomcat 5.0.28.
 
Thanks a lot for any help,
 
Gonçalo