How to debug a bean in JSP page with JBX???

How to debug a bean in JSP page with JBX???
i have a bean within a JSP page. i wanna find out how do they varibles work and changes of them values.
are there some ways or tools to get the situations of them in visual way? just like when i debug VB program,i can get the situations in immediately window.

help me !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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