jsp+servlet动态表格显示数据库内容问题?报错

小弟写了个对数据库进行查询的小程序，bean+dao+service+servlet+jsp，jsp动态表格显示从数据库中查询的数据，到了for循环的地方老是报错，代码如下：

<% List<Goods> good = new ArrayList(); good = (List) request.getAttribute("SEARCH_INFO"); Goods g = new Goods(); %>

<form action="GetGoodsInfoServlet" method="get">
	<div align="center">
		<font size="20">显示商品信息</font><br> 请输入查询的关键字： <input type="text"
			name="goods" id="goods" value="" /> <input type="submit" value="查询" />

		<table border="1">
			<tr>
				<td>ID</td>
				<td>商品信息概览</td>
				<td>网站链接</td>
			</tr>
			<%
				for (int i = 0; i < good.size(); i++) {
					g = (Goods) good.get(i);
			%>

			<tr>
				<td><%=g.getId()%></td>
				<td><%=g.getGoodsinfo()%></td>
				<td><a

<%=g.getUrl()%>"><%=g.getUrl()%></a></td> </tr> <% } %>

		</table>

	</div>
</form></pre> 

错误如下：Servlet.service() for servlet [jsp] in context with path [/Spider] threw exception [An exception occurred processing JSP page /SearchInfo.jsp at line 34


31: <td>网站链接</td>
32: </tr>
33: <%
34: for (int i = 0; i < good.size(); i++) {
35: g = (Goods) good.get(i);
36: %>
37: 




Stacktrace:] with root cause
java.lang.NullPointerException

求助