Jdon发帖子出错:

03-05-07 zxczf

点"发新贴"出现错误:
下面有错误发生,请将错误报告到: Jdon
java.lang.NullPointerException
at org.apache.jsp.post_jsp._jspService(post_jsp.java:161)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

在post.jsp页面中:
User pageUser = null;
if (!isGuest) {
System.out.println("1 myEnv.getForumFactory():" + myEnv.getForumFactory());//== null
pageUser = myEnv.getForumFactory().getUserManager().getUser(authToken.getUserID());
}
请问这是怎么回事