Programming java in PDA

Hi all,
I am very new to java.
I am wondering if it is possible to development simple program (mainly for learning java) in Java at PDA powerd by Palm OS. I mean I actually want to write any pure java program at my pda, and run it in my pda.
The reason about that, I want to learn java, and prototype somethings in java, while I am on the way to my office or back home (2 hrs!!)
therefore, if it is possible, what do I set up for my pda, or is that any simple java IDE for Palm OS?!
thanks a million!

this site for editors etc.. http://www.palmos.com/dev/tools/

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Method to get working Java program on a PDA

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I am attempting to create a java program for my PDA. I'm trying to use CrEme to do it but I am having many many problems with it. I've looked on the forums and they all appear to be posts where people have some clue. I have none.
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Hi,
short:
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J2ME: http://java.sun.com/j2me/index.html
;)

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user12873853 wrote:
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Hi,
I have two years programming experience in Java, and I now need to write a program that will run on a PDA - most likely a Compaq iPAQ. I need to send input data from the PDA via Bluetooth to other mobile devices, and also parse the information input by the user into an HTML that will be sent to the internet.
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Issue with launching Java Program - Java Library Problem?

I hope this is the right forum, I apologize if it isn't. I am having issues launching a program for a video game that uses java. One of the devs told me to post my issue here, as he doesn't know how much more help he can give with this issue. Using the java -jar command, this is the printout I get:
Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Users\vecdran>java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)
C:\Users\vecdran>chdir C:\Games\Steam\Steamapps\common\Crysis\mods\mwll\actionma
pper\dist
C:\Games\Steam\steamapps\common\crysis\Mods\mwll\Actionmapper\dist>java -jar Act
ionmapper.jar
Jun 18, 2010 2:25:19 PM org.jdesktop.application.Application$1 run
*SEVERE: Application class mwllactionmapper.MWLLActionmapperApp failed to launch*
*java.lang.NullPointerException*
at javax.swing.ImageIcon.<init>(Unknown Source)
at javax.swing.ImageIcon.<init>(Unknown Source)
at sun.swing.WindowsPlacesBar.<init>(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.updateUseShellFo
lder(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponent
s(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(Unknow
n Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.JFileChooser.updateUI(Unknown Source)
at javax.swing.JFileChooser.setup(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at mwllactionmapper.model.ActionmapsFileModel.getMWLLDocumentsFolder(Act
ionmapsFileModel.java:141)
at mwllactionmapper.model.ActionmapsFileModel.getMWLLProfiles(Actionmaps
FileModel.java:160)
at mwllactionmapper.MWLLActionmapperView.doSelectProfile(MWLLActionmappe
rView.java:603)
at mwllactionmapper.MWLLActionmapperView.<init>(MWLLActionmapperView.jav
a:75)
at mwllactionmapper.MWLLActionmapperApp.startup(MWLLActionmapperApp.java
:21)
at org.jdesktop.application.Application$1.run(Application.java:171)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.Error: Application class mwllac
tionmapper.MWLLActionmapperApp failed to launch
at org.jdesktop.application.Application$1.run(Application.java:177)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at javax.swing.ImageIcon.<init>(Unknown Source)
at sun.swing.WindowsPlacesBar.<init>(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.updateUseShellFo
lder(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponent
s(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(Unknow
n Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.JFileChooser.updateUI(Unknown Source)
at javax.swing.JFileChooser.setup(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at mwllactionmapper.model.ActionmapsFileModel.getMWLLDocumentsFolder(Act
ionmapsFileModel.java:141)
at mwllactionmapper.model.ActionmapsFileModel.getMWLLProfiles(Actionmaps
FileModel.java:160)
at mwllactionmapper.MWLLActionmapperView.doSelectProfile(MWLLActionmappe
rView.java:603)
at mwllactionmapper.MWLLActionmapperView.<init>(MWLLActionmapperView.jav
a:75)
at mwllactionmapper.MWLLActionmapperApp.startup(MWLLActionmapperApp.java
:21)
at org.jdesktop.application.Application$1.run(Application.java:171)
... 8 more
C:\Games\Steam\steamapps\common\crysis\Mods\mwll\Actionmapper\dist>As you can see, my Java is completely up to date, and this is the only program I appear to have problems launching. I have no idea what to do from here. :(
PS.
I had to add the Java path to my System -> Environmental Variables -> Path variable, as it was not there from the start, and before adding it command prompt wouldn't recognize java commands. Don't know whether this indicates anything.
Edited by: vecdran on Jun 20, 2010 11:23 AM

[Bug ID 4711700|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4711700] is eerily similar to what you're experiencing. Although the bug was reported against an older version of the JDK the last comment provides a workaround to the problem that may be helpful. Good luck.

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Hello All, need help again.
I am trying to create a Client server program, where, the Client first sends a file to Server, on accepting the file, the server generates another file(probably xml), send it to the client as a response, the client read the response xml, parse it and display some data. now I am successful sending the file to the server, but could not figure out how the server can create and send a xml file and send it to the client as response, please help. below are my codes for client and server
Client side
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class XMLSocketC
     public static void main(String[] args) throws IOException
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          Socket toServer = null;
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          int port = 4444;
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               toServer = new Socket(host, port);
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            System.err.println("Don't know about host: localhost.");
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        //===========================================================
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               // TODO Auto-generated catch block
               e1.printStackTrace();
          try{
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               System.out.println("Read failed");
               System.exit(1);
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public class XMLSocketS
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             try {
                 serverSocket = new ServerSocket(4444);
             } catch (IOException e) {
                 System.err.println("Could not listen on port: 4444.");
                 System.exit(1);
          Socket clientLink = null;
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                       System.out.println("Server accepts");
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                         BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
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                         int readMe;
                         while( (readMe = inn.read(buff)) >= 0)
                         {     //reads from input stream, writes the file to disk
                              ut.write(buff, 0, readMe);
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                         clientLink.close();
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                         inn.close();
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                         ut.flush();
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                         ut.close();
                         //Sending response to client
                         //============================================================
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                         System.out.println("File received");
          }catch(IOException ex)
          {System.out.println("Exception.");}
                    finally
                         try
                              if (clientLink != null) clientLink.close();
                         }catch(IOException e) {}
             clientLink.close();
             //serverSocket.close();
}

SERVER
import java.net.*;
import java.io.*;
public class XMLSocketS
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             try {
                 serverSocket = new ServerSocket(4545);
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                 System.err.println("Could not listen on port: 4444.");
                 System.exit(1);
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              try
                         clientLink = serverSocket.accept();
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                     BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
                         BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
                         byte[] buff = new byte[1024];
                         int readMe;
                         while( (readMe = inn.read(buff)) >= 0)
                         {     //reads from input stream, writes the file to disk
                              ut.write(buff, 0, readMe);
                         ut.flush();
                         //Sending response to client
                         //============================================================
                         BufferedInputStream ftoC = null;
                         BufferedOutputStream outtoC = null;
                         // File to be send over the socket.
                         File file = new File("c:/xampp/htdocs/thesis/user_registration_response.xml");
                         try
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                               ftoC = new BufferedInputStream(new FileInputStream(file));
                         }catch(IOException eee)
                         {System.out.println("Problem reading file");}
                         // OutputStream to socket
                         outtoC = new BufferedOutputStream(clientLink.getOutputStream());
                         byte[] buffer = new byte[1024];
                         int noRead;
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                         while( (noRead = ftoC.read(buffer)) >= 0)
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                              outtoC.write(buffer, 0, noRead);
                         outtoC.flush();
                         //============================================================
                         System.out.println("File received");
          }catch(IOException ex)
          {System.out.println("Exception.");}
                    finally
                         try
                              if (clientLink != null) clientLink.close();
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             clientLink.close();
             //serverSocket.close();
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import java.io.*;
import java.net.*;
public class XMLSocketC
          @SuppressWarnings("deprecation")
          public static void main(String[] args)
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               String host = "127.0.0.1";
               int port = 4545;
               BufferedInputStream fileIn = null;
               BufferedOutputStream out = null;
               // File to be send over the socket.
               File file = new File("c:/xampp/htdocs/thesis/sensorList.xml");
               try
                    // InputStream to read the file
                    fileIn = new BufferedInputStream(new FileInputStream(file));
               }catch(IOException eee)
               {System.out.println("Problem");}
               try
                         System.out.println("Establishing Socket Connection");
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                         Socket clientSocket = new Socket(host, port);
                         System.out.println("Socket is clear and available.....");
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                         out = new BufferedOutputStream(clientSocket.getOutputStream());
                         byte[] buffer = new byte[1024];
                         int numRead;
                         //Checking if bytes available to read to the buffer.
                         while( (numRead = fileIn.read(buffer)) >= 0)
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                              out.write(buffer, 0, numRead);
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                         out.flush();
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                         DataInputStream in = new DataInputStream(new BufferedInputStream(clientSocket.getInputStream()));
                         BufferedWriter outf = new BufferedWriter(new FileWriter("c:/xampp/htdocs/received_from_server.txt",true));
                         String str;
                         while(!(str = in.readLine()).equals("EOF")) {
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                              outf.newLine();//write a new line to the file (for better format)
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                         out.close();
                         // close InputStrean
                         fileIn.close();
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                         clientSocket.close();
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     Could you please point where am I doing the stupid mistake, client to server is working properly, but the opposite direction is not.
Thanks

Programming java in PDA

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