test_initParam.jsp

In web.xml

<context-param>
<param-name>thewebapp</param-name>
<param-value>http://hoare.cs.umsl.edu/servlet/siegel</param-value>
</context-param>

test_initParam.jsp

<%@ taglib prefix='c' uri='http://java.sun.com/jsp/jstl/core' %>
<!doctype html>
<html>
<head>
  <title>Test initParam</title>
</head>
<body>
<c:set var="thewebapp" value="${initParam.thewebapp}"/>
<center>
  <h1>Just Submit</h1>
  <hr />
  <font size="+3">
  <form method="get" action="${thewebapp}/a_table.jsp" >
    <input type="submit" value="Submit">
  </form>
  </font>
</center>
</body>
</html>

The Browser Sees

   
   <font size="+3">
   vform method="get" action="http://hoare.cs.umsl.edu/servlet/siegel/a_table.jsp" >
  <input type="submit" value="Submit">