jsp 小脚本 object转换Map错误 - Java / Web 开发

Action中部分代码:
HttpSession session = request.getSession();
Map map = new HasMap();
map.put("1","1");
session.setAttribute("cart",map);
jsp:
我在JSP页面用<% Map map = (Map)session.getAttribute("cart"); %>这样他就报错了；
错误:Type mismatch: cannot convert from Object to Map
但在java.class文件就对着,我不晓得小脚本要把obj转换为map怎么弄,不转换的时候可以打印出session里面的值；谁知道怎么转换啊

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2010-4-21 19:40:02 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 99 in the jsp file: /jsp/joanne/bijCart.jsp
Duplicate local variable map
96: <td height="40" style="line-height:15px; height:60px;">&nbsp;
97: <%
98: session.setAttribute("user","123");
99: String map = session.getAttribute("user").toString();
100:
101: out.print(map);
102: %>
试着转换为String都不行

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问题现在是我必须用小脚本输出 那种强制类型转换不行 貌似跟JDK什么的有关系？

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LZ...Hasmap是啥?不是hashmap么?

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LZ不好意思...当我上面没回过...因为我没看到过Hasmap,嘿嘿...