May be try restarting the development mode server.
On Oct 7, 8:42 pm, x_maras <dinost...@gmail.com> wrote:
> Hi,
>
> I was trying to do some simple JDO queries in order to find my way in
> java google app engine.
> I have an persistent object where I store information about users,
> called UserData
> I also have made a class DAO where I have methods for creating new
> users for checking if a user exist and to show data for users.
> I created 2 records successfully but I can't read them.
> The error that I get is
> HTTP ERROR 500
>
> Problem accessing /. Reason:
>
> com.awt.oat.dao.UserDao.showUserData()V
> Caused by:
>
> java.lang.NoSuchMethodError: com.awt.oat.dao.UserDao.showUserData()V
> at org.apache.jsp.auction_jsp._jspService(auction_jsp.java:89)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
> ....
> .... and a lot more
> ....
>
> I'm sure that I 'm doing something really stupid. Please someone to
> help me...
>
> Here is my DAO class code:
>
> package com.awt.oat.dao;
>
> import javax.jdo.PersistenceManager;
> import com.awt.oat.PMF;
> import com.awt.oat.model.UserData;
> import com.google.appengine.api.users.User;
> import javax.jdo.Query;
> import java.util.List;
> import java.util.Date;
> import javax.jdo.JDOObjectNotFoundException;
>
> public class UserDao {
> public void createUser(String uniqueID, String userName, String email)
> {
> Date date = new Date();
> UserData newUser = new UserData(uniqueID, userName, email,
> date);
>
> PersistenceManager pm = PMF.get().getPersistenceManager();
> try {
> pm.makePersistent(newUser);
> }finally {
> pm.close();
> }
> }
>
> public void showUserData(){
>
> PersistenceManager pm = PMF.get().getPersistenceManager();
> Query query = pm.newQuery(UserData.class);
>
> try{
> List<UserData> results = (List<UserData>)query.execute();
>
> if (results.iterator().hasNext()) {
> for(UserData u : results){
> System.out.println("<table border='1'>" +
> "<tr><td>username</td><td>" +
> u.getUserName() + "</tr>"
> + "<tr><td>email</td><td>" +
> u.getEmail() + "</td></tr></
> table>");
> }
> } else {
> System.out.printf("<p>No results in the
> datastore</p>");
> }
> }finally{
> query.closeAll();
> }
> }
>
> }
>
> and here my jsp file
>
> <%@ page contentType="text/html;charset=UTF-8" language="java" %>
> <%@ page import="java.util.List" %>
> <%@ page import="javax.jdo.PersistenceManager" %>
> <%@ page import="com.google.appengine.api.users.User" %>
> <%@ page import="com.google.appengine.api.users.UserService" %>
> <%@ page import="com.google.appengine.api.users.UserServiceFactory" %>
> <%@ page import="com.awt.oat.dao.UserDao" %>
> <%@ page import="java.io.*" %>
>
> <html>
> <head>
> <link type="text/css" rel="stylesheet" href="/stylesheets/
> main.css" />
> </head>
> <body>
> <%
> UserService userService = UserServiceFactory.getUserService();
> User user = userService.getCurrentUser();
> if (user != null) {
> %>
> <p>Hello, <%= user.getNickname() %>! (You can
> <a href="<%= userService.createLogoutURL(request.getRequestURI())
> %>">sign out</a>.)</p>
> <%
> } else {
> %>
> <a href="<%= userService.createLoginURL(request.getRequestURI())
> %>">Sign in</a>
> <%
> }
> UserDao dao = new UserDao();
> //dao.createUser(user.getUserId(), user.getNickname(),
> user.getEmail()); this one works creates new users in the database
> dao.showUserData(); //this gives me error
> %>
> </body>
> </html>
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