jsp连mysql时出错java.lang.NoClassDefFoundError: org/aspectj/lang/Signature,个位大哥求救呀!问题解决马上给分.

小弟在做一个例的时,想用jsp连接mysql(5.0.19)我用的JDBC驱动是mysql-connector-java-3.1.12-bin.jar,应用服务是tomcat(5.0.28),jdk(1.4.2_07).不在tomcat服务下时,我写了个控制台的程序,可以连接数据,可是到tomcat下就不行了,现面是原码和错误:
<%
   try
    {
     Class.forName("org.gjt.mm.mysql.Driver").newInstance();
System.out.println("Class.forName()");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost/demo","root","guopeng");
     Statement st=conn.createStatement();
     ResultSet rs=st.executeQuery("select * from user");
     while(rs.next())
     {
System.out.println(rs.getString(2).toString());
}
    }catch(Exception e)
             {
out.println("LoadDriver:      \n"+e.toString());
    }
  %>///////////////////////////////////////////////////////////////////////////
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: org/aspectj/lang/Signature
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.login_jsp._jspService(login_jsp.java:115)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:141)
org.apache.jsp.login_jsp._jspService(login_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.