null « Tomcat « JSF Q&A

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1. How could randomly my session is null?    stackoverflow.com

I am using Tomcat 6.0, JSF2.0.2 I realized that randomly HttpServletRequest getSession method, returns null. I could the session randomly be null? How can I debug who sets the session to null? I checked ...

2. Does ExpressionLanguage (EL) allow to call a method with a NULL argument?    stackoverflow.com

I use Tomcat7 with JSF2. I use method invocations like 

 action="#{bean.method(22)}"
or 
 action="#{bean.method(var)}"
where var is an EL variable. However, if var is null, or i try to call #{bean.method(null) i get an ...