jsp对mysql进行数据查询问题

这是完整的页面 
<%@ page import="javax.naming.InitialContext"%>
 <%@ page import="java.sql.*"%>
<%@ page import="com.gwfg.dbconn.*"%>
<%@ page import="com.gwfg.info.*"%>
<%@ page import="com.gwfg.work.*"%>
<%@ page import="com.gwfg.publicbean.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
   <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
   <title>用户登录验证</title>
   <jsp:useBean id="userinfo" scope="session" class="com.gwfg.info.UserInfo"/>
   <jsp:setProperty name="userinfo" property="*"/>
</head><body>
  <%
 try { 
         CharDisposal cd = new CharDisposal();
 UserWork uw=new UserWork();
 userinfo.setUSER_NAME(cd.trans(userinfo.getUSER_NAME()));
   //try{
       Connection conn = null;
   Statement stmt=null;
       ResultSet rst=null;
   conn = DatabaseConn.getConnection();
       out.print("数据库测试");
   String sql="select * from t_user where USER_NAME='"+userinfo.getUSER_NAME().trim()+"' and USER_PASSWORD='"+userinfo.getUSER_PASSWORD().trim()+"'";
       if(conn!=null)
      {
           out.println("Connection is OK!");
           out.println("<br>");
       stmt=conn.createStatement();
           rst=stmt.executeQuery(sql);
           out.println("以下是从数据库中读取出来的数据");
          while(rst.next())
         {
               out.println("用户编码:"+rst.getString("USER_ID"));
   out.println("&nbsp;&nbsp;&nbsp;&nbsp;用户编码:"+cd.trans(rst.getString("USER_NAME")));
   out.println("&nbsp;&nbsp;&nbsp;&nbsp;密码:"+rst.getString("USER_PASSWORD"));
           out.println("<br>");         }
     }else{
        out.println("Fail!");
 }
   }catch(Exception ne)
    {
out.println(ne);
  }  
 //out.print(userinfo.getUSER_DEPARTMENT()+"<br>");
 //out.print(userinfo.getUSER_NAME()+"<br>");
 //out.print(userinfo.getUSER_PASSWORD()+"<br>");
 //String flag=uw.QueryUser(userinfo);
 //out.print(flag+"<br>");  /*int flag=uw.QueryUser(userinfo);
     if (flag==1) 
     {
        //密码正确
       session.setAttribute("ses_userinfo", userinfo);//将userBean放入Session对象中
           response.sendRedirect("glory/glory_index.jsp") ;         }else { 
    //密码错误  
 response.sendRedirect("fail.jsp") ;
         }
      }catch(Exception e)
  { 
         out.print("<table width=\"100%\"  height=\"100\"  border=\"0\" cellspacing=\"0\" cellpadding=\"0\">");
         out.print("<tr>");
         out.print("  <td class=\"msg\" align=\"center\" valign=\"middle\">数据库访问出错,请联系系统管理员!</td>");
         out.print("</tr>");
         out.print("</table>");  
  }*/
  %> 
</body>
</html>运行后出现以下错误:
java.sql.SQLException: General error message from server: "Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (gb2312_chinese_ci,COERCIBLE) for operation '='"