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Using beans in JSP

<jsp:useBean>

<jsp:useBean> loads a java bean into a JSP page. 
<jsp:useBean id="some_identifier" class="Foo.class" />
The name specified with id (here: some_identifier) is a name of a variable to wich a new instance of the class will be bound. An equivalent for the statement would be: 
<% Foo some_identifier=new Foo(); %>
This is among the reasons why a EJB must have a zero argument constructor.

<jsp:getProperty>

<jsp:getProperty name="some_identifier" property="SomeProperty" />
This is of course equivalent to 
<% some_identifier.getSomeProperty(); %>

<jsp:setProperty>

<jsp:setProperty name="some_identifier" property="SomeProperty" value="Some new value" />