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JSP Variable
  1. Scriptlet
     <% String myvar %>
    Accessible only in scriptlet or  <%= myvaar %>.
    Inaccesible in JSTL
  2. JSTL
    1. <c:set name="myvar" value="" scope="page/request/session/application"/>
      Similar to pageContext.set(), requestContext.set()
    2. Accessible in jstl EL: ${myvar}
  3. JSTL EL
    1. ${param.url_param}
    2. ${sytem_variable == 'mystring'}