Tomcat sharing data across different contexts

for tomcat
add crossContext="true" to server.xml for the web applications context:

<Context docBase="C:/eclipse/workspace/WebAppA/WebContent"  
path="/WebAppA" crossContext="true"  reloadable="true">

</Context>



<Context  docBase="C:/eclipse/workspace/WebAppB/WebContent" 
path="/WebAppB"  crossContext="true" reloadable="true">

</Context>

set a variable in webappa:

ServletContext myContext =  session.getServletContext();

            
myContext.setAttribute("userid",  userid);

forward to webappb get the value set in webappa:

     
ServletContext otherContext =  session.getServletContext().getContext("/WebAppA");

    
String account =  (String)otherContext.getAttribute("userid");