Greetings all,
I've used Eclipse to create a Spring/Hibernate standalone desktop GUI app whose behavior has got me buffaloed - it stalls with no error messages when it hits an HQL query statement in a DAO method.
UserDAOHibernate.java
Code:
package com.ecs.trial_spring.dao.hibernate;
import org.hibernate.*;
import org.springframework.transaction.annotation.Transactional;
import com.ecs.trial_spring.dao.UserDAO;
import com.ecs.trial_spring.model.User;
import static org.hibernate.criterion.Expression.*;
import java.util.*;
import utils.Utils;
import java.net.*;
import java.sql.*;
@Transactional
public class UserDAOHibernate implements UserDAO
{
private SessionFactory sf;
public void setSessionFactory(SessionFactory sf) { // contextual sessions method
this.sf = sf;
}
@SuppressWarnings("unchecked")
public boolean validateIt( String aa, String bb, String cc, String dd)
{ // username passsword appname serialnumber
boolean out_bool = false;
System.out.println(" entering UserDAO.validateIt with:" + aa + ":" + bb + ":" + cc + ":" + dd);
String sqlcmd_a;
String sqlcmd_b;
List<User> results_b = null;
User result_b = null;
String sqlcmd_c;
Long id_of_user;
java.util.Date today = new java.util.Date();
sqlcmd_b = " FROM User WHERE userName = :kxa ";
System.out.println(" got to A");
Query hqlQuery_b = sf.getCurrentSession().createQuery( sqlcmd_b); // <-- this line causes stall
System.out.println(" got to B");
hqlQuery_b.setParameter( "kxa", aa);
System.out.println(" got to C");
results_b = hqlQuery_b.list();
System.out.println(" got to D");
if( results_b.size() == 1) {
System.out.println(" got to E");
result_b = results_b.get(0);
System.out.println(" got to F");
id_of_user = result_b.getId();
System.out.println(" got to G");
if( result_b.getPasssword().equals( Utils.generateShaOfString(bb))) {
System.out.println(" got to H");
out_bool = true;
}
}
System.out.println(" exiting UserDAO.validateIt with:" + out_bool);
return out_bool;
}
@SuppressWarnings("unchecked")
public User getUniqueObj( String aa)
{
List<User> results = null;
User result = null;
String sqlcmd;
sqlcmd = " FROM User WHERE userName = :kxa ";
Query hqlQuery = sf.getCurrentSession().createQuery( sqlcmd);
hqlQuery.setParameter( "kxa", aa);
results = hqlQuery.list();
if( results.size() == 1) {
result = results.get(0);
}
return result;
}
}
and the relavent parts of my stripped-down app. All it does is accept two string values and has two Login buttons.
Each calls validateAgainstDB which in turn calls the the DAO's validateIt method.
Code:
//Create a button
buttonLoginA.setPreferredSize( new Dimension(90, 30));
buttonLoginA.setMaximumSize( new Dimension(90, 30));
buttonLoginA.setAlignmentX(Component.RIGHT_ALIGNMENT);
buttonLoginA.setToolTipText("click to log in to application");
buttonLoginA.addActionListener( new ActionListener() {
public void actionPerformed( ActionEvent e) {
SwingWorker worker8 = new SwingWorker<Object, Void>() {
protected String doInBackground() throws InterruptedException {
if( validateAgainstDB( nameOfUser.getText(), passwordOfUser.getText(), appName, serno)) {
msgA.setText("A user logged in: " + currUser.getUsername());
msgB.setText("xxx");
System.out.println("yea, validation worked for A");
} else {
System.out.println("boo, validation FAILED for A");
}
return "yea";
}
protected void done() {
}
};
worker8.execute();
}
});
//Create a button also works
buttonLoginB.setPreferredSize( new Dimension(90, 30));
buttonLoginB.setMaximumSize( new Dimension(90, 30));
buttonLoginB.setAlignmentX(Component.RIGHT_ALIGNMENT);
buttonLoginB.setToolTipText("click to log in to application");
buttonLoginB.addActionListener( new ActionListener() {
public void actionPerformed( ActionEvent e) {
if( validateAgainstDB( nameOfUser.getText(), passwordOfUser.getText(), appName, serno)) {
msgA.setText("xxx");
msgB.setText("B user logged in: " + currUser.getUsername());
System.out.println("yea, validation worked for B");
} else {
System.out.println("boo, validation FAILED for B");
}
}
});
...........
public boolean validateAgainstDB( String aa, String bb, String cc, String dd)
{
boolean out_bool = false;
if( this.userDAO.validateIt(aa, bb, cc, dd)) {
System.out.println("should get to here when validation is successfull");
this.currUser = this.userDAO.getUniqueObj(aa);
out_bool = true;
}
return out_bool;
}
public static void main( String[] args)
{
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater( new Runnable() {
public void run() {
String inn_str, tmp_str, roww;
Problem theApp;
theApp = new Problem();
ApplicationContext ctx = new ClassPathXmlApplicationContext("ApplicationContext.xml");
org.hibernate.SessionFactory sfA = (SessionFactory) ctx.getBean("sessionFactoryA", SessionFactory.class);
theApp.sessA = sfA.openSession();
theApp.userDAO = (UserDAO) ctx.getBean("userDAO");
org.hibernate.SessionFactory sfB = (SessionFactory) ctx.getBean("sessionFactoryB", SessionFactory.class);
theApp.sessB = sfB.openSession();
theApp.createAndShowGUI();
}
});
}
executing opens the GUI just fine, I fill in the username and password, click the LoginA button , validateAgainstDB gets called, UserDAOHibernate.validateIt gets called,
"got to A" gets printed then the program stalls on line 46. No error msgs, nothing, like an infinite wait-state. Commenting out lines 46-62 and forcing
out_bool = true at the top of the method allows the program to work perfectly.
So I am at a loss - how could this be happening, and how do I debug something when there's no messages or errors thrown?
I'm so frustrated, I'll even throw some cold hard cash on getting this solved - anyone living within 30mi of Arizona State University wants to take a crack at this,
I'll meet them with my laptop and if they can get this working it's worth USD50.00.
Or if you're further away but still want a crack at it, I could zip up some scripts and send it to you. You'd have to create a User table and populate it with one row, the adjust a properties file to point to your database.
TIA,
Still-learning Steve
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