关于一个green hand的jsp问题,我已经没办法了！！！

[chesterwoo]

我是green hand，今日编写jsp代码出错，尝试解决未果，只得求助各位朋友。
代码片段如下：
......
<jsp:useBean id="entry" class="sales.SaleEntry"/>

<jsp:setProperty name="entry" property="itemID" value='<%=request.getParameter("itemID")%>'/>

<%
int numItemsOrdered=1;
try
{
numItemsOrdered=Integer.parseInt(request.getParameter("numItems"));
}
catch(NumberFormatException nfe) {}
%>
......

错误提示如下：
500 Servlet Exception
/MyTest/JavaBean_2/SaleEntry.jsp:41: 期望 <identifier>
catch(NumberFormatException) {}
^
/MyTest/JavaBean_2/SaleEntry.jsp:44: 期望 ')'
pageContext.write(_jsp_string1, 0, _jsp_string1.length);

[chesterwoo]

另附.我的运行环境为win2000 server+apache1.3.19+resin1.3.b1.

[chesterwoo]

well i need score to give others. so i have to retrieve more score.