variable « JavaBean « JSP-Servlet Q&A

1. Retrieve JavaBean names associated with JSP or build variable with dynamic name

I am usign a JavaBean in a jsp page. I would like to give it a dynamic name, because depending on the value of a variable (let's call it foo), I ...

2. Where can the variable in jsp be defined except java classes?

Suppose I have the following code:

<c:when test="${isFoo}">
Where can isFoo be defined except:
  1. java classes
  2. <c:set ... /> construction ?

3. how to assign a value to a variable fetched from java bean over JSP?

I am working on JSP and servlets. I need to fetch values from java bean and assign it some other variable over JSP. Usually I fetch the value in html tags as ...