weblogic session 不能被清除

使用session.invalidate();报下面这样的错误：
[code="java"]
Error 500--Internal Server Error
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request
[/code]

使用下面一段代码去清除，也清除不掉。
[code="java"]
<%@page import="java.util.Enumeration"%>
<%@page import="java.lang.reflect.Method"%>
<%
session = request.getSession();
for (Enumeration e = request.getSession().getAttributeNames(); e.hasMoreElements();) {

out.println("+++++++++++++++++"+e.nextElement());
}
%>


<%
String name = "";
for (Enumeration e = request.getSession().getAttributeNames(); e.hasMoreElements();) {
name = (String)e.nextElement();
out.println("+++++++++++++++++"+name);
session.removeAttribute(name);

//session.removeValue(name);
}
%>
<%
Method[] methods=HttpSession.class.getMethods();
for(int i=0; i out.println(methods[i].getName());
}
//session.invalidate();
for (Enumeration e = request.getSession().getAttributeNames(); e.hasMoreElements();) {
out.println("+++++++++++++++++"+e.nextElement());
}
%>
[/code]

我使用的盗版的weblogic 9.2

我已经解决了；
[code="java"] <%

String name = "";

for (Enumeration e = request.getSession().getAttributeNames(); e.hasMoreElements();) {

name = (String)e.nextElement();

//out.println("+++++++++++++++++"+name);
session.setAttribute(name,null);
//session.removeAttribute(name);

//session.removeValue(name);

}
%> [/code]

解决方案很多 学习了