请问如下JSP代码为何在JB中编译时报错？？

<body>
<p>
<h1> Do you have enough?</h1>
<br>
<%-- Get paramaters from the request object --%>
<% String firstName = request.getParameter("fName"); %>
<% String balance = request.getParameter("bal"); %>
<%-- Convert the bal paramater from String to double --%>
<% double accountBalance = Double.valueOf(balance).doubleValue(); %>
<%-- Output results --%>
Balance for <%=firstName %>: <%=accountBalance %> <br>
<br>
<%-- Is balance high enough? --%>
<%
if(accountBalance <= 100.00)
{
%>
<b> Get a Job. </b> <br>
<%
}
%>
</body>