[urgent[ Passing object from server to the midlet

I am building a search function for my mobile application..
I created a servlet "SearchServlet.java" that basically send a query to the dbase to retrieve the values in the database.
In this servlet, I store the results in an arraylist..
The servlet works just fine *I've tested it in the browser and accessed it through the local host"..
The concern now is, what if I need to call the servlet from the midlet application..
How to pass the object from the server to the midlet?
Could someone explain to me the mechanism to pass the object?
What object should be the return value in SearchServlet.java?
Thank you very much..

First of all use sober language on forums, its not
your private forum where you can use your abusive
language.And even if it is than its not good manners
to speak in public.Well, quite honestly, my language was not that abusive... I aleady told you that that it's wrong several times... No response on those (at least nothing showing that i would be wrong). And if you keep linking to that code, I find that very anoying.
Second of all. the try catch block sends response
back to J2me app request.Its upto developer whatever
response he wants to send back. There is nothing
wrong in that.No, all it does it declare a string, nothing more, nothing less. No need to catch any exception!
third of all if you think that writeUTF method is
totally wrong, then why dont you show me the
improved solution or correct solution. After all its
forum site, if you know the better solution please
show me rather than always criticising and using
abusive languages.I told you several times that you should read the api docs! It's all in there and you see why you should not read data with readline() when you write that data with writeUTF(). If you fail to do that, and are not capable to learn from that, then that's your own problem. Sure I could show you what it should be (and I beleive I did more than ones), but what does that teach you? Not a lot! Only to keep coming back here and ask more questions that can be found if you take two minutes of time and read docs or search the internet using google or whatever search engine you like (or even the forum search enigne, since that is also rarely used). I'm not talking about you in particular, but about the general level of the questions asked here. 75% of the answers can be found with a little more effort, and in less time than it would take to wait for someone else to come up with an answer.
So please, read what writeUTF() does, and you'll understand what's wrong.
Let me show you:
Writes a string to the underlying output stream using UTF-8 encoding in a machine-independent manner.
First, two bytes are written to the output stream as if by the writeShort method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string. Following the length, each character of the string is output, in sequence, using the UTF-8 encoding for the character. If no exception is thrown, the counter written is incremented by the total number of bytes written to the output stream. This will be at least two plus the length of str, and at most two plus thrice the length of str. What does readline() do? It reads UTF-8 text until some endline character. So it will also read the two length bytes of the wirteUTF method. Is this good? No, it's not. If the lengt is to long, it could even insert extra text characters in the line that should not be there, since readline doesn't know anything about the length bytes, and theats them as normal UTF-8 text.
If you think I dont understand API properly than make
me explain, thats what forums are for...You never said you didn't understand the api docs... I think they are very clear
To end it I really doubt that you are developer/
coder. If you think yourself too perfect please guide
me.I'm not perfect, I'm just putting effort into finding solution myself.
If you are going to continue such an attitude I have
to report to Java forums administrator.I realy don't mind.
Note to original user who posted this message: I am
sorry to write such a comment in your thread, but
"deepspace" user really needs some help.Please, if you want to make a comment, be constuctive. Talking about abusive language... This might be subtle, but it still is abusive! Tell that to all the users I helped already... I bet I'm the most active user here at the moment and I think I helped a whole lot of them very well. Some didn't like my method at first, but in the end, most wil apriciate what I did. I like to let user find out stuff for themselfs, and not give them what they want. They learn much more thay way for sure!

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Passing Information From Server to GUI

Hi, I'm making a chat client, but I'm having trouble passing information from server's input stream to my GUI. I made two threads, one for sending and one for receiving, and I start them both when I click "connect" after I log in to the server. So what happens is I run my program, the frame appears as I want it to, and then I click connect, and after a little wait the button "unclicks" (or w/e) and nothing happens. I don't know why I am not receiving the messages from the server. If I make the program "GUI-less" it works, I can both send and receive messages via the console. But in the GUI, where I am sending/receiving via my two TextAreas, it doesn't work. Here's my code:
(I apologize ahead of time for posting so much code in a thread, I tried to cut it down as best as I could.)
actionPerformed method for connect and disconnect buttons (in BotWindow class)
public void actionPerformed(ActionEvent evt) {
        JButton src = (JButton)evt.getSource();
        if(src == connect) {
            try {
                bnet = new BattleNet("useast.battle.net");
                bnet.logIn("dynobot1", "test");
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                System.out.println(error);
        if(src == disc) {
            try {
                BattleNet bnet = new BattleNet("useast.battle.net");
                bnet.logOut();
            catch(Exception error) {
                System.out.println(error);
BattleNet class
import java.io.*;
import java.net.*;
public class BattleNet extends SendAndReceive {
    Socket sock;
    InputStream in;
    OutputStream out;
    Send send;
    Receive receive;
    public BattleNet(String server) {
        try {
            sock = new Socket(server, 6112);
            in = sock.getInputStream();
            out = sock.getOutputStream();
            send = new Send(this.out);
            receive = new Receive(this.in);
        catch(Exception error) {
            System.out.println(error);
    public void logIn(String username, String password) {
        byte[] u = username.getBytes();
        byte[] p = password.getBytes();
        try {
            out.write((byte) 0x03);
            out.write((byte) 0x04);
            out.write(u);
            out.write((byte) 0x0a);
            out.write(p);
            out.write((byte) 0x0a);
            receive.start();
            send.start();
        catch(IOException e) {
            System.out.println(e);
    public void logOut() {
        try {
            sock.close();
            in.close();
            out.close();
        catch(Exception error) {
            System.out.println(error);
SendAndReceive class (with Threads as subclasses)
import java.io.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.*;
public class SendAndReceive implements ActionListener {
    JButton src = null;
    public SendAndReceive() {}
    public void actionPerformed(ActionEvent evt) {
        src = (JButton)evt.getSource();
class Send extends Thread {
    OutputStream out;
    SendAndReceive sr = new SendAndReceive();
    BotWindow bw = new BotWindow();
    public Send(OutputStream inputOut) {
        out = inputOut;
    public void run() {
        if(sr.src == bw.submit) {
            String newLine = "\n";
            String messageOut = bw.inText.getText();
            bw.outText.setText(bw.outText.getText() + newLine + messageOut);
            byte[] m = messageOut.getBytes();
            try {
                out.write((byte) 0x05);
                out.write(m);
            catch(IOException e) {
                System.out.println(e);
            String blank = "";
            bw.inText.setText(blank);
            sr.src = null;
class Receive extends Thread {
    InputStream in;
    SendAndReceive sr = new SendAndReceive();
    BotWindow bw;
    public Receive(InputStream inputIn) {
        in = inputIn;
        bw = new BotWindow();
    public void run() {
        while(true) {
            try {
                bw.outText.setText(bw.outText.getText() + (char)in.read());
            catch(IOException e) {
                System.out.println(e);
}So, to repeat my questions, SendAndReceive class, but I'm not sure if this is the right approach.why isn't my TextArea (BotWindow.outText) not receiving and setting it's text to the information from the server? Is my threading correct? Also, with the way I set up the threads, will the Send function be able to send in the midst of the receive function? I tried to set it up so that it could by implementing ActionListener in my SendAndReceive class, but I am not sure if this is the correct approach.
P.S. The reason I put this in Swing is because it works without a GUI/Swing components! If it will help, I will post the GUI-less program I made that works.

Multi-post. Reply to this posting: http://forum.java.sun.com/thread.jspa?threadID=656211

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Client unable to get the javax.activation.DataHandler object from Server

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Hi Stif,
Thanks for your response.I did debug from server side,it has printing content of Data Handler properly.
Also i have debug request and response messages using TCP/IP monitor(RAD environment has this feature).The response from the server is going proplery.
But the client side Data Handler is coming null.
Any advice or solution would be greatly appreciated.
Thanks,
Sreeni.

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Thanks for taking the time to test this. I also tried with a String and was successful but still cannot get it to work with my SecurityContextImpl. I also tried passing a String wrapped in a custom bean with a single string property. I get the same ClassCastException. I think that using a String works because it is native to the JVM and somehow bypasses the class loading issue but as I say, my knowledge of classloaders is null.
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Hei,
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I have my servlet and there I want
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How can I send and get the object in a servlet?
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Hei,
sorry.. maybe I gave to less informations. In fact it's only one servlet...
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I wrote the whole project without using Servlet-Technique but normal Java-App. But I designed it so, that I only had to rewrite one class.. and least I thought so.. but now I stuck at this Object-passing problem.
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Thanks
Edited by: user9293762 on Sep 3, 2010 2:33 AM

Hi user9293762,
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Jatinder

Thanks.
I tried ArrayExampla.java and was successful in passing array values to the stored database procedure.
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Hi Tom Cole,
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[urgent[ Passing object from server to the midlet

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