[appengine-java] Re: failure in simple JDO query
hmm...
I did through eclipse...
On Oct 8, 3:11 am, Arnold arnold.mi...@gmail.com wrote:
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{
ListUserData results = (ListUserData)query.execute();
if (results.iterator().hasNext()) {
for(UserData u : results){
System.out.println(table border='1' +
trtdusername/tdtd
+ u.getUserName() + /tr
+ trtdemail/tdtd
+ u.getEmail() + /td/tr/
table);
}
} else {
System.out.printf(pNo 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) {
%
pHello, %= 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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[appengine-java] Re: Datastore, Java, JSP, JSON, AJAX, Web Page. Is it going to work?
Dear Stevko, First of all, thank you for your answer. Could you help me a little bit with fundamentals of this? I am using eclipse to create my google app engine structure. I know html, javascript, ajax. I have also learned google datastore and I m not that bad in java... I have read JSON But I'm missing some connection between them. I found about json rpc - java but I don't know how to use it in google app engine... Kind regards, Dinos On Oct 7, 2:11 am, andy stevko andy.ste...@gmail.com wrote: Hi x_maras, re: using email as a primary keyhttp://code.google.com/appengine/docs/java/users/overview.html The User object exposes a unique user ID that is guaranteed to be stable for the lifetime of the user's account, even if the email address is changed. You can use this value in a datastore entity key or property value. re: Datastore, Java, JSP, JSON, AJAX, Web Page Writing a RESTful service that can respond to AJAX requests with JSON payloads is very much a mainstream way to do things on app-engine. Be careful to keep the processing response times really short. The max response time is 30 seconds, the sweet spot is to average about 1 second response time. Happy Coding, --Stevko On Wed, Oct 6, 2010 at 4:34 PM, x_maras dinost...@gmail.com wrote: Hi, I am new to GAE and I want to make a web application page on it. I was used to work with PHP for web applications but lately I am struggling to get in the thinking of a GAE web application. After reading tutorials and trying to do different things I came up with a thinking how I want my project to be and how to make the communication through the different layers. I will explain you my thinking and I would like to tell me if am I in the right way and if I am not I would like someone to put back into it. e.g. I thought to have a user @persistent class for storing the information of a user, such as name, email(as a primary key), registration date etc... (I will use the User class for logging in, but I want to keep some data also for every user) Then I need to create a java (dao) class that reads and inserts data to the datastore tables-objects. I thought to create a different one for each @persistent class Then Java files that execute the functions from the DAO classes and give information to the jsp files which through JSON give information to the Ajax functions in the HTML page (which I was thinking also to be the welcome-file in my web.xml) So here comes the questions. Is something like this right? Is it going to work? And if not what do you propose me to do. Any links or examples are very very welcome. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2B unsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] failure in simple JDO query
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{
ListUserData results = (ListUserData)query.execute();
if (results.iterator().hasNext()) {
for(UserData u : results){
System.out.println(table border='1' +
trtdusername/tdtd +
u.getUserName() + /tr
+ trtdemail/tdtd +
u.getEmail() + /td/tr/
table);
}
} else {
System.out.printf(pNo 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) {
%
pHello, %= 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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To post to this group, send email to google-appengine-j...@googlegroups.com.
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For more options, visit this group at
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[appengine-java] Datastore, Java, JSP, JSON, AJAX, Web Page. Is it going to work?
Hi, I am new to GAE and I want to make a web application page on it. I was used to work with PHP for web applications but lately I am struggling to get in the thinking of a GAE web application. After reading tutorials and trying to do different things I came up with a thinking how I want my project to be and how to make the communication through the different layers. I will explain you my thinking and I would like to tell me if am I in the right way and if I am not I would like someone to put back into it. e.g. I thought to have a user @persistent class for storing the information of a user, such as name, email(as a primary key), registration date etc... (I will use the User class for logging in, but I want to keep some data also for every user) Then I need to create a java (dao) class that reads and inserts data to the datastore tables-objects. I thought to create a different one for each @persistent class Then Java files that execute the functions from the DAO classes and give information to the jsp files which through JSON give information to the Ajax functions in the HTML page (which I was thinking also to be the welcome-file in my web.xml) So here comes the questions. Is something like this right? Is it going to work? And if not what do you propose me to do. Any links or examples are very very welcome. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Datastore, Java, JSP, JSON, AJAX, Web Page. Is it going to work?
Hi, I am new to GAE and I want to make a web application page on it. I was used to work with PHP for web applications but lately I am struggling to get in the thinking of a GAE web application. After reading tutorials and trying to do different things I came up with a thinking how I want my project to be and how to make the communication through the different layers. I will explain you my thinking and I would like to tell me if am I in the right way and if I am not I would like someone to put back into it. e.g. I thought to have a user @persistent class for storing the information of a user, such as name, email(as a primary key), registration date etc... (I will use the User class for logging in, but I want to keep some data also for every user) Then I need to create a java (dao) class that reads and inserts data to the datastore tables-objects. I thought to create a different one for each @persistent class Then Java files that execute the functions from the DAO classes and give information to the jsp files which through JSON give information to the Ajax functions in the HTML page (which I was thinking also to be the welcome-file in my web.xml) So here comes the questions. Is something like this right? Is it going to work? And if not what do you propose me to do. Any links or examples are very very welcome. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] User Personal page
Hi, I'm new to the cloud and not an experienced developer. For a course I have to make a web application using the GAE and I will also use JAVA for it. I did a few tutorials but I still have questions that don't let me start with my project. In my application I want people to be able to login (I have figured out how to do it) and I also want to have different data presentation depending to each user (this I don't know how to do it) I have experience of php and mysql but it is my first time that I 'm working with Datastore. So I would like to know what can separate each user connected with a google account. Could I have something like the PHP session for checking if a user is logged in? How I could also make relationship in datastore objects like relating 2 sql tables for example. I would be grateful if someone could give me this information or provide me some links where I could find answers. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
