GWT and MySQL Connection

Hey, I am trying to create a voting system I've got a MySQL DB already
up (using WAMP) and I'm using Eclipse Galileo with GWT. I have looked
everywhere on how to make this connection and now I am sure I connect
to the DB at least, however I am unsure regarding if I actually
retrieve anything from it and I can't print anything because it throws
me an exception. This is the method that should access the DB:

public User authenticateUser(String user1, String pass) {
User user = null;
try {
PreparedStatement ps = conn.prepareStatement(
"SELECT user, pass FROM usuarios WHERE user = \"" + user1 +
"\" AND " +
"pass = \"" + pass + "\""
);
ResultSet result = ps.executeQuery();
while (result.next()) {
user = new User(result.getString(2), result.getString(3));
System.out.println(user.getUser().toString());
System.out.println("toy aqui");
}
result.close();
ps.close();
} catch (SQLException sqle) {
System.err.println("Fail!! = " + sqle.getStackTrace());
}
return user;
}

"conn" is a Connection already made here:

public MySQLConnection() {
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection(url, user, pass);
} catch (Exception e) {
System.err.println("Fail en la Conexion = " + e.getStackTrace
());
}
}

after this, I use this method which should allow me to access stuff
from the newly created object:

private class AuthenticationHandler<T> implements AsyncCallback<User>
{
public void onFailure(Throwable ex) {
label.setText("Fail");
System.out.println(ex.getStackTrace());
}
public void onSuccess(User result) {
try {
label.setText("Success");// + " Pass:: " + result.getPass
().toString()
}catch(Exception e) {
System.err.println("Fail! = " + e.getStackTrace());
}
}
}

The thing is, it doesn't matter if I introduce wrong values for the
Query to be made with, (user1 and pass) I get success or fail
everytime depending on which I started with. That is, if I tried once
and failed, then everytime after I will get "Fail" and if I try and
get the write data in I will get "Success" everytime.

I don't know why this happens and I am unsure I am performing the
query the way it should be done.

The only thing I'm 100% sure of is that the DB connection is made, and
that if I try to print "result.getUser();" in the last method I placed
here, I get an exception.

What am I missing or doing incorrectly?
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