log4j.jar locked by Tomcat even after remove/undeploy....

This issue has been brought up before with no response I use Tomcat-4.1.11 and the manager app to install/remove | deploy/undeploy | start/stop my webapp which contains log4j-1.2.6.jar in WEB-INF/lib. What I'd like to be able to do is uninstall or undeploy the webapp and run a clean

log4j implementation

Dear Sir/Madam, I am working on J2EE project.There i am using different design pattern in J2EE application. 1. Business Delegate 2. Session Bean/Entity Bean 3. DAO 4. Database I am interested to use log4j. Please can you clarify me how can i handle exception and log them using log4j. 1. How