java.lang.IllegalStateException: Cannot forward after response has been committed

sql = "select * from user where enroll= 1"; // 通过的
rs = mvc.getList(sql);
mySession.setAttribute("rs", rs);
RequestDispatcher requestDispathcer = request.getRequestDispatcher("/admin.jsp");
requestDispathcer.forward(request, response);HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception java.lang.IllegalStateException: Cannot forward after response has been committed
com.fuyou.servlet.loginservlet.doPost(loginservlet.java:104)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.25 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.5.25