how two web applications share a java bean object ?

Dear All: I set a java bean in one web application, whether add this bean to session or ServletContext. I can't get it in the other web application. How does a bean transmit between different web applications in Tomcat ? Web Application 1 servlet1

how two web applications share security realms ?

Dear all: I have two web applications named homepage and login. Application login is for authenticate users. How those two web applications share security realms? I found if i define security-constraint and login-config tags for homepage/web.xml and login/web.xml, I access to