Regarding Constraint Handling using Java

Hi,
I am currently trying to develop a system whereby the user can obtain a work schedule by stating the constraints such as public holiday etc.
I came across a language, Java Constraint Handling Rules (JCHR). From a overview, it will aid in defining the constraints.
However, there is simply too little references on the internet. Should any one has knowledge on it, please kindly reply me. I need help urgently. Thank you.
Tina

http://www.pms.informatik.uni-muenchen.de/software/jack/docu/jase.html

Similar Messages

General discussion - image handling using Java

Hi,
I am working on an image-processingtool over 4 month and i am a little annoyed by
the handling of images in java/JAI.
The differentiation between the color model, the sample model and the databuffer looks
very nice and oop. In practice it is very complicated ...
Try to load an image ... convert this to an gray-image and then do some operations onto
this image under the restriction, that the values of each pixel should be minimal 16bits long.
I found each class i should use to create such an buffered image. I do so ... but the result is
not the one I suggest.
The support of 16/32bit per pixel images is in general not the best at the core jdk.
The JAI-library provide better support on the first look but there you got to know much knowledge
how to use the library(the api is not very self documentating).
One one side I though .. hey why you don't let the images be images and only work with Raster's?
But you can't do any JAI-operation on a Raster nor can't you create a image only with the raster itself.
There you end up in difficult merge conflicts with rasters, buffered images or planar images and the
precission of 16/32 bits per pixel or only 8 bits.
For me as a practical user of java.awt.image and jai the complicated usage of those classes in the cases
I described was not the best sign. I don't got the time to read books about color models, sample models etc.
to write an app which should do "only simple edge detecting ops".
So maybe in future releases of the jdk this point of view can be noticed.
Greetings,
Olek

As I remember Studio4 place resource files under
project folder in the .jar file. If you working on
"sampleproject", and place a pic/splash.png into .jar
you can reach it like
Image image =
Image.createImage("sampleprojec/pic/splash.png");
I'm not sure, but you could simple check it if you
look into .jar file.How do I look into the .jar file? Open it in notepad and try and decipher the text, in there it says "res/player.png", but I've tried that, I've tried "/res/player.png", "player.png", "/player.png", "/bin/game/player.png","/bin/game/res/player.png" nothing works, actually I can't compile anything now either - the world has all gone wrong.....

How to read XML Values using JAVA

Hi FRNDS,
I uploaded one XML File in imported Archieves, i have to read the value form XML uisng JAVA code,
using XSL able to read like xsl variable name='TimeZone' select =$linkDoc//...........*
But using java i have to read the value from XML,is it possible to read the value??
please give me some sample code.
regards,
Raja Sekhar

But using java i have to read the value from XML,is it possible to read the value??
Check the below JAVA code from help:
http://help.sap.com/saphelp_nwpi71/helpdata/en/55/7ef3003fc411d6b1f700508b5d5211/content.htm
you can ignore the XSLT part and configure only the JAVA code...check if this suits your needs.
Regards,
Abhishek.

Handling Billing Information using Java - Insecure??

Our firm is currently developing an e-commerce building site using java. An issue has propped up while trying to design how thw site should handle payments . The developers are adamant that due to the ease with which class files can be decompiled , we shouldnt let the user enter his payment info( like credit card no: ) on our site , rather forward to a secure gateway site. But the client is of the view that doing this will break the flow of the process and points out that many sites do make usre enter info on their site . I'm sure you must know more on this than i do , is it safe to let the user enter the info on our site and let we pass them to the provider ?

confused__ wrote:
Our firm is currently developing an e-commerce building site using java. An issue has propped up while trying to design how thw site should handle payments . The developers are adamant that due to the ease with which class files can be decompiled , we shouldnt let the user enter his payment info( like credit card no: ) on our site , Fire those developers and hire somebody competent.
Ther are plenty of secure sites that are backed by Java. You need to make sure that the information that needs to be secured is encrypted before transmission. You'd do this by using HTTPS rather than HTTP. This has nothing to do with what language you're using on the back end. If you're using an applet on the client side, it should still be possible to use HTTPS.
Typically in a web app like this, the Java is all on the server side, and the end user can never see it. Even if it is an applet, so the Java does come to the client browser, the CC info will not be inside the source code, and seeing the source will not give a bad guy the ability to intercept CC numbers, unless your developers are idiots and use a homegrown, non-keyed encryption algorithm whose security relies on not knowing the algorithm, or embed a database connection URL and password in the applet code.
Seriously--I would be very worried about your developers' qualifications.
Edited by: jverd on Jun 21, 2008 12:02 PM

Trying to write data to a text file using java.io.File

I am trying to create a text file and write data to it by using java.io.File and . I am using JDeveloper 10.1.3.2.0. When I try run the program I get a java.lang.NullPointerException error. Here is the snippet of code that I believe is calling the class that's causing the problem:
String fpath = "/test.html";
FileOutputStream out = new FileOutputStream(fpath);
PrintStream pout = new PrintStream(out);
Do I need to add additional locations for source files or am I doing something wrong? Any suggestions would be appreciated.
Thank you.

Hi dhartle,
May be that can help:
* Class assuming handling logs and connections to the Oracle database
* @author Fabre tristan
* @version 1.0 03/12/07
public class Log {
    private String fileName;
     * Constructor for the log
    public Log(String name) {
        fileName = name;
     * Write a new line into a log from the line passed as parameter and the system date
     * @param   line    The line to write into the log
    public void lineWriter(String line) {
        try {
            FileWriter f = new FileWriter(fileName, true);
            BufferedWriter bf = new BufferedWriter(f);
            Calendar c = Calendar.getInstance();
            Date now = c.getTime();
            String dateLog =
                DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM,
                                               Locale.FRANCE).format(now);
            bf.write("[" + dateLog + "] :" + line);
            bf.newLine();
            bf.close();
        } catch (IOException e) {
            System.out.println(e.getMessage());
     * Write a new line into a log from the line passed as parameter,
     * an header and the system date
     * @param   header The header to write into the log
     * @param   info    The line to write into the log
    public void lineWriter(String header, String info) {
        lineWriter(header + " > " + info);
     * Write a new long number as line into a log from the line
     * passed as parameter, an header and the system date
     * @param   header The header to write into the log
     * @param   info    The line to write into the log
    public void lineWriter(String header, Long info) {
        lineWriter(header + " > " + info);
     * Enable to create folders needed to correspond with the path proposed
     * @param   location    The path into which writing the log
     * @param   name        The name for the new log
     * @return Log         Return a new log corresponding to the proposed location
    public static Log myLogCreation(String location, String name) {
        boolean exists = (new File(location)).exists();
        if (!exists) {
            (new File(location)).mkdirs();
        Log myLog = new Log(location + name);
        return myLog;
     * Enable to create the connection to the DB
     * @return Connection Return a new connection to the Oracle database
    public static Connection oracleConnectionCreation() throws Exception {
        // Register the Oracle JDBC driver
        DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
        //connecting to the DB
        Connection conn =
            DriverManager.getConnection("jdbc:oracle:thin:@myComputerIP:1521:myDB","user", "password");
        return conn;
     * This main is used for testing purposes
    public static void main(String[] args) {
        Log myLog =
            Log.myLogCreation("c:/Migration Logs/", "Test_LinksToMethod.log");
        String directory = "E:\\Blob\\Enalapril_LC-MS%MS_MS%MS_Solid Phase Extraction_Plasma_Enalaprilat_ERROR_BLOB_test";
        myLog.lineWriter(directory);
        System.out.println(directory);
[pre]
This class contained some other functions i've deleted, but i think it still works.
That enables to create a log (.txt file) that you can fill line by line.
Each line start by the current system date. This class was used in swing application, but could work in a web app.
Regards,
Tif

Difference in using java,xslt,message mapping

hi friends,
          Can i know what difference does it make in using JAVA Mapping ,XSLT and Message Mapping?
          Where and when it is used?
          Which one is advantageous?
thanks and regards,
Prashanth

Hi Prashant,
Please go through the following links:
Mapping:
http://help.sap.com/saphelp_nw04/helpdata/en/c8/b78d406b305537e10000000a1550b0/frameset.htm
For Java Mapping:
http://help.sap.com/saphelp_nw04/helpdata/en/e2/e13fcd80fe47768df001a558ed10b6/frameset.htm
For XSLT Mapping:
http://help.sap.com/saphelp_nw04/helpdata/en/73/f61eea1741453eb8f794e150067930/frameset.htm
Error handling in XSLT Mapping:
http://help.sap.com/saphelp_nw04/helpdata/en/8a/7672f7d7e444439fd7024f806221a4/frameset.htm
You can also refer some How to guides:
XI New Mapping Features article,
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/xi/xi 3.0 new mapping features article.evn
Generic XSLT Mapping and Sample Code,
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/xi/xi code samples/generic xslt mapping and sample code.pdf
How to use ABAP-MApping in XI3.0,
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/xi/3.0/how to use abap-mapping in xi 3.0.pdf
I hope it helps,
Thanks & Regards,
Varun Joshi

How to use java to send emails

Hi,
I am having problems trying to send an email using java. No idea what is going on because it looks fine. Can anyone give any insight?
Cheers
Robert
import java.awt.event.*;
import java.awt.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
* JEmail.java
* @author Robert Venning 18/09/2005
* @version 1.0
public class JEmail extends JFrame implements ActionListener{
     private static final long serialVersionUID = 1L;
     final int SMTP_PORT = 25;
     JLabel fromLabel = new JLabel("From: ");
     JLabel toLabel = new JLabel("To: ");
     JLabel ccLabel = new JLabel("CC: ");
     JLabel subjectLabel = new JLabel("Subject: ");
     JTextField from = new JTextField(20);
     JTextField to = new JTextField(20);
     JTextField cc = new JTextField(20);
     JTextField subject = new JTextField(20);
     JTextArea message = new JTextArea(10,30);
     JScrollPane scrollPane = new JScrollPane(message);
     JButton send = new JButton("Send");
     public JEmail(){
          super("Email Program");
          JPanel mainPane = new JPanel();
          JPanel pane = new JPanel();
          JPanel fromPane = new JPanel();
          JPanel toPane = new JPanel();
          JPanel ccPane = new JPanel();
          JPanel subjectPane = new JPanel();
          mainPane.setLayout(new FlowLayout());
          pane.setLayout(new GridLayout(4,1));
          fromPane.add(fromLabel);
          fromPane.add(from);
          toPane.add(toLabel);
          toPane.add(to);
          ccPane.add(ccLabel);
          ccPane.add(cc);
          subjectPane.add(subjectLabel);
          subjectPane.add(subject);
          pane.add(fromPane);
          pane.add(toPane);
          pane.add(ccPane);
          pane.add(subjectPane);
          mainPane.add(pane);
          mainPane.add(scrollPane);
          mainPane.add(send);
          setContentPane(mainPane);
          send.addActionListener(this);
     public static void main(String[] args) {
          JFrame aFrame = new JEmail();
          aFrame.setSize(350, 400);
          aFrame.setVisible(true);
     public void actionPerformed(ActionEvent event){
          try{
               PrintWriter writer = new PrintWriter(new FileWriter("log.txt"));
               String input, output;
               Socket s = new Socket("mail.tpg.com.au", SMTP_PORT);
               BufferedReader in = new BufferedReader
                    (new InputStreamReader(s.getInputStream()));
               BufferedWriter out = new BufferedWriter
          (new OutputStreamWriter(s.getOutputStream()));
               output = "HELO theWorld" + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               input = in.readLine();
               System.out.println(input);
     //          writer.println(input);
               output = "MAIL FROM: <" + from.getText() + ">" + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               input = in.readLine();
               System.out.println(input);
     //          writer.println(input);
               output = "RCPT TO: <" + to.getText() + ">" + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               input = in.readLine();
               System.out.println(input);
          //     writer.println(input);
               output = "DATA" + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               input = in.readLine();
               System.out.println(input);
          //     writer.println(input);
               output = "Subject: " + subject.getText() + "\n";
               out.write(output);
               out.flush();
          System.out.print(output);
          writer.println(output);
          output = "From: Robert Venning <" + from.getText() + ">" + "\n";
               out.write(output);
               out.flush();
          System.out.print(output);
          writer.println(output);
               // message body
          output = message.getText() + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               output = ".\n";
               out.write(output);
               out.flush();
               System.out.println(output);
               writer.println(output);
               output = "QUIT" + "\n";
               out.write(output);
               out.flush();
               System.out.print(output);
               writer.println(output);
               input = in.readLine();
               System.out.println(input);
     //          writer.println(input);
               writer.close();
               s.close();
          catch(Exception exception){
               exception.printStackTrace();
}

Hi, floppit. For sending emails, I used the JavaMail API. Here is some code I wrote where I used JavaMail. The most relevant lines are in bold.
/*   File: ListenNotifier.java
* Author: Fabricio Machado
*          [email protected]
* This utility is based on the "Listen.java" tool from the Tiny OS
* java tools package, in /tinyos-1.x/tools/java/net/tinyos/tools/.
* The original application has been extended to convert raw packet data into
* a more meaningful representation of actual photo sensor readings in
* lux.
* The application checks the readings against a user-defined
* threshold, and sends email notifications when readings break the
* threshold, and also when readings dip back below the threshold.
* Currently, the code is only fit to handle packets from the Tiny OS
* nesc application OscilloscopeRF.nc. The code gets the packet data
* by connecting via TCP to a Tiny OS java tool called "Serial Forwarder."
* "Serial Forwarder" takes packets from the base station, and forwards
* them to TCP port 9001.
* Below is UC Berkeley's copyright disclaimer regarding the original code.
*                              |   |
*                              |   |
*                              |   |
*                              |   |
*                            __|   |__
*                                v
* "Copyright (c) 2000-2003 The Regents of the University of California.
* All rights reserved.
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice, the following
* two paragraphs and the author appear in all copies of this software.
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
* Copyright (c) 2002-2003 Intel Corporation
* All rights reserved.
* This file is distributed under the terms in the attached INTEL-LICENSE
* file. If you do not find these files, copies can be found by writing to
* Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA,
* 94704. Attention: Intel License Inquiry.
import java.util.Properties;
import java.io.*;
import java.net.*;
import net.tinyos.packet.*;
import net.tinyos.util.*;
import net.tinyos.message.*;
import javax.mail.internet.*;
import javax.mail.*;
import java.util.*;
public class ListenNotifier{
    public static void main(String args[]) throws IOException, MessagingException {
     int i;
     int j = 0;
     Integer threshold=0;
     String to="";
     String timeStamp;
     // Check to see if user is running the program correctly.
     // If -T option is not used, a default value of 250 lux is
        // set as threshold . . .
     switch (args.length){
     case 0:
           System.err.println("usage: java ListenNotifier < EmailAddress1 > < EmailAddress2 > . . . -T < Threshold >\n");
           System.exit(2);
           break;
     case 1:
         to = args[j];
         threshold = 250;
         break;
     default:
         if (args[args.length-2].equals("-T")){
          threshold = threshold.valueOf(args[args.length-1]);
          to = args[0];
          while(!args[j+1].equals("-T")){
              to = to + " " + args[j+1];
              j++;
          break;
         else{
          j = 0;
          threshold = 250;
          to = args[j];
          while((j + 1) < args.length){
              to = to + " " + args[j+1];
              j++;
          System.out.printf("Mailing list is: %s\n", to);
          break;
     // Connect to the Serial Forwarder on TCP port 9001 . . .
         PacketSource reader = BuildSource.makeSF("192.168.0.12",9001);
     // Check to see if connection to Serial Forwarder successful . . .
     if (reader == null) {
         System.err.println("Invalid packet source (check your MOTECOM environment variable)");
         System.exit(2);
     try {
         // Use JavaMail API methods to set up an
         // email session . . .
      Properties props = System.getProperties();
     Session session = Session.getInstance(props, null);
     javax.mail.Message message = new MimeMessage(session);
         // Open the packet source . . .
         reader.open(PrintStreamMessenger.err);
         // Set a threshold boolean to be used so
         // email is sent only once after threshold
         // is exceeded.
         Boolean limit = false;
         for (;;) {
          // The node ID field in the OscilloscopeRF packet
          // is 2 bytes long, but all byte pairs in the packet
          // are in little endian order. Thus, the bytes must
          // be re-ordered. They are then converted to unsigned
          // integers and added together to obtain the node ID.
          byte[] packet = reader.readPacket();
          Integer nodeID = (( int ) packet[5] & 0xFF) + ((( int ) packet[6] & 0xFF)<<8);
          System.out.printf("Packet from node %d . . . \n", nodeID);
          // Begin extracting data payload of sensor readings,
                // which are stored in the last 20 bytes of the packet . . .
         for (i = 0; i <= 9; i++){
          // Convert reading to integer, display on screen . . .
          Integer sensorData = (( int ) packet[(2*i)+11] & 0xFF) + ((( int ) packet[(2*i)+12] & 0xFF)<<8);
          System.out.printf("Sample %d reading at %d lux.\n", i+1, sensorData);
          // Is sensor reading above limit?
          if(!limit && (sensorData >= threshold)){
              limit = true;
              System.out.printf("WARNING: SENSOR READING ABOVE THRESHOLD--SENDING NOTICE BY TEXT MESSAGE.\n");
              // Compute a time stamp for when threshold was exceeded.
              java.util.Locale locale = Locale.getDefault();
              java.text.DateFormat dateFormat = java.text.DateFormat.getDateTimeInstance(java.text.DateFormat.LONG,
                                                              java.text.DateFormat.LONG, locale);
              timeStamp = dateFormat.format(new java.util.Date());
              // Build message and send to recipients in mailing list . . .
              message.setFrom();
          message.setRecipients(javax.mail.Message.RecipientType.TO, InternetAddress.parse(to, false));
          message.setSubject("WARNING: NODE " + nodeID.toString() + " SENSOR READING ABOVE THRESHOLD!");
          message.setText("Node " + nodeID.toString() + " sensed " + sensorData.toString() + " lux on " + timeStamp + "\n");
          Transport.send(message);
              System.out.printf("%s\n",timeStamp);
          // Has sensor reading now dropped from above threshold to below threshold?
          // Same concept as before . . .
          if(limit && (sensorData < threshold)){
              limit = false;
              System.out.printf("READING BELOW THRESHOLD AGAIN . . . SENDING NOTICE BY TEXT MESSAGE.\n");
              java.util.Locale locale = Locale.getDefault();
              java.text.DateFormat dateFormat = java.text.DateFormat.getDateTimeInstance(java.text.DateFormat.LONG,
                                                              java.text.DateFormat.LONG, locale);
              timeStamp = dateFormat.format(new java.util.Date());
              message.setFrom();
          message.setRecipients(javax.mail.Message.RecipientType.TO, InternetAddress.parse(to, false));
          message.setSubject("NODE " + nodeID.toString() + " READING BELOW THRESHOLD AGAIN.");
          message.setText("Node " + nodeID.toString() + " sensed " + sensorData.toString() + " lux on " + timeStamp + "\n");
          Transport.send(message);
              System.out.printf("%s\n",timeStamp);
         System.out.println();
         System.out.flush();
     // Catch IOException from Tiny OS java method, and
     // MessagingException from setRecipients method in JavaMail API . . .
     catch (IOException e) {
         System.err.println("Error on " + reader.getName() + ": " + e);
     catch(MessagingException e){
     System.err.println("Error in javax.mail.message.setRecipients:\n" + to);
}

Set Folder Presentation LayoutSet using Java

HI
I need to set the presentation layoutset using Java.
Can somebody guide me as to how the API can be used?
I discovered this inteface 'ILayoutSetEvent' in the package 'com.sapportals.wcm.rendering.base' that has the methods 'getLayoutSet()' and 'setLayoutSet()'.
However, i do not know how to get a handle on this for a particular folder.
Any help would be appreciated.
Thanks
Alkesh

Hello,
I'm not sure if the API is officially released, but ...
You need the ILayoutService, which is a repository service. There your can either set a profile or a layoutset for a folder (collection).
public boolean saveParametersForCollection(
   ICollection collection,
   ILayoutSet parameters,
   ILayoutContext context);
The paramter 'collection' is the folder, for which you want to save the settings.
The parameter 'context' is a key for the iView you want to have the settings in. If you want to have the same settings for this folder in all iViews, you may use null.
The parameter 'parameters' is the map with all settings you want to save. This may be in the simplest way only the name of the layoutset.
The coding may look like:
import com.sapportals.wcm.repository.service.layout.*;
import com.sapportals.portal.pcd.gl.IPcdGlService;
import com.sapportals.portal.prt.component.IPortalComponentRequest;
import com.sapportals.portal.prt.runtime.PortalRuntime;
import com.sapportals.wcm.IWcmConst;
import com.sapportals.wcm.repository.ICollection;
import com.sapportals.wcm.repository.ResourceException;
import com.sapportals.wcm.repository.ResourceFactory;
import com.sapportals.wcm.repository.service.layout.customizing.ILayoutSet;
import com.sapportals.wcm.repository.service.layout.customizing.IParameterNameConst;
import com.sapportals.wcm.repository.service.layout.customizing.flavor.IFlavorConst;
public class SettingsUtil {
public static void saveLayoutset(String layoutSetID, ICollection collection, IPortalComponentRequest req) {
    try {
      // get the layout service
      ILayoutService layoutService = (ILayoutService) ResourceFactory.getInstance().getServiceFactory().getRepositoryService(collection,
          IWcmConst.LAYOUT_SERVICE);
      // check for null, class cast...
      // get the context
      ILayoutContext context = null;
      try {
        String name = req.getComponentContext().getProfile().getComponentName();
        // get a short iView id from the GLService if possible
        IPcdGlService service = (IPcdGlService) PortalRuntime.getRuntimeResources().getService(IPcdGlService.KEY);
        String shortContextID = service.getPcdObjectFactory().convertUrlToShortName(name);
        context = layoutService.getContextForUser(collection.getContext().getUserUME(), shortContextID);
      } catch (IllegalArgumentException e) {
        // handle exception
      ILayoutSet layoutSet = layoutService.createLayoutSet();
      try {
        layoutSet.setParameter(IFlavorConst.FLAVOR_NULL, IParameterNameConst.SETNAME, layoutSetID);
      } catch (LayoutServiceConfigLoadException e1) {
        // handle exception
      // save the settings for the folder
      layoutService.saveParametersForCollection(collection, layoutSet, context);
    } catch (ResourceException e) {
      // handle exception
This is only a sceleton. Use with care.
ShortcontextID or User may be null.
regards
Andreas

Can we use Java Script in SAP BusinessObjects Web Intelligence 4.1?

Can we use Java Script or any other Script in BI 4.1 Web Intelligence? If possible please do let me know the method/process

Hi Kranthi,
You have option to read a cell content as html. else you will have to go for SDK. I think you will get better suggestions, if you can explain your requirement in a little detailed manner.
refer below links for more details about SDK.
http://bukhantsov.org/2013/04/how-to-create-a-webi-document-using-java-report-engine-sdk/
Regards,
Nikhil Joy

Unable to get 'InitialContext' using Java Client in Oracle App 10.0.2.0

Scenario & Problem Description: Unable to get 'Initial Context' using Simple Java Client in Oracle Application Server 10.0.2.0
I'm having an issue while I try to initialize the Initial Context for an EJB lookup from a simple Java Client [local lookup], but the same code snippet works fine when I try from Servlet. I have enclosed the Exception Stack Trace and the Code Snippet for your reference.
1. .NET Client ---> Servlet --> LookupUtility --> EJB --> DB - Issue
2. .NET Client ---> Servlet --> EJB --> DB - Works
Exception: java.lang.InstantiationException: Error communicating with server: Lookup error: javax.naming.AuthenticationException: Invalid username/password for Config (guest); nested exception is: nested exception is: Exception in InitialContext: javax.naming.NamingException: Lookup error: javax.naming.AuthenticationException: Invalid username/password for Config (guest) at com.evermind.server.ApplicationClientInitialContextFactory.getInitialContext(ApplicationClientInitialContextFactory.java:149)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
at javax.naming.InitialContext.init(InitialContext.java:219)
at javax.naming.InitialContext.<init>(InitialContext.java:195)
at com.seagate.edcs.config.util.LookupUtility.getInitialContext(LookupUtility.java:123)
at com.seagate.edcs.config.util.LookupUtility.getConfiguration (LookupUtility.java:69)
at com.seagate.edcs.config.util.LookupUtility.main(LookupUtility.java:135)
Code Snippet:
* This method returns the Configuration for the properties set.
public ArrayList getConfiguration ( ) throws Exception {
ArrayList arrayList = null;
try {
Context context = getInitialContext();
System.out.println("Context : " + context);
Object home = context.lookup("java:comp/env/ejb/com.seagate.edcs.config.ejb.ConfigSessionEJBHome");
System.out.println("Object home : " + home);
ConfigSessionEJBHome configSessionEJBHome = (ConfigSessionEJBHome)PortableRemoteObject.narrow(home, ConfigSessionEJBHome.class);
System.out.println("ConfigSessionEJBHome configSessionEJBHome : " + configSessionEJBHome);
ConfigSessionEJB configSessionEJB =(ConfigSessionEJB)PortableRemoteObject.narrow(configSessionEJBHome.create(), ConfigSessionEJB.class);
System.out.println("ConfigSessionEJB configSessionEJB : " + configSessionEJB);
arrayList = configSessionEJB.getAllConfig();
System.out.println("Context : " + context);
} catch (Exception ex) {
System.out.println("Exception Occured");
throw ex;
return arrayList;
* Get an initial context from the JNDI tree.
private Context getInitialContext() throws NamingException {
try {
Hashtable hashtable = new Hashtable();
hashtable.put("java.naming.factory.initial", "com.evermind.server.ApplicationClientInitialContextFactory");
hashtable.put("java.naming.provider.url", "ormi://seagate.mil-shivas-270.am.ad.seagate.com/home"); // if we won't specify the port, it considers the default port
hashtable.put("java.naming.security.principal","ias_admin");
hashtable.put("java.naming.security.credentials","ias123");
return new InitialContext(hashtable);
} catch (NamingException ne) {
System.out.println("Exception in InitialContext.");
throw ne;
Note:
1. The user "ias_admin" & password "ias123" are the credential provided for the 'Admin' while installing the Oracle App Server and using these credentials I'm able to bring the Admin Console. Also, added new user 'guest/guest' - assigned this user to the 'admin' group ...
2. Since its a local lookup, there is no need to specify the credentials, but at runtime a dialog box pops up prompting to enter the 'userid/password' and when I enter the crendtials, I get the exception as stated. [In case of Servlet - EJB lookup, I'm not specifying any credentials]
Are there are any configuration parameters which I need to provide in any of the .xml? Could you please let me know the fix for the same.
Regards,
Kafeel/-

Please use the OS {forum:id=210}

Need help to create a new record in mdm using java webdynpro

hi all,
I have to develop an application to create a new record in mdm by using java WebDynpro . Please help me what is the process that i have to follow to do this and provide me if you have any step by step guidance for this.
thanks & regards,
Mahi.

Hi,
The below link will help u to make the application in JAVA webdynpro
The article has code to for creating records.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/803e9e80-21f4-2a10-8cbf-bcf6a8060be3
Hope this may help u .
Rgds
Ankit

How to get the values from struct data type using java code..?

Hi ,
I am newer to java.
we are using oracle database.
How to get the data from struct data type using java code.
Thanks in Advance.
Regards,
kumar

Hi Rajeev,
To retrieve a FilterContainer you will need to traverse the report structure:
ReportStructure boReportStructure = boDocumentInstance.getStructure();
ReportContainer boReportContainer = (ReportContainer) boReportStructure.getReportElement(0);
FilterContainer boFilterContainer = null;
if (boReportContainer.hasFilter()) {
boFilterContainer = boReportContainer.getFilter();
} else {
boFilterContainer = boReportContainer.createFilter(LogicalOperator.AND);
Calling boDocumentInstance.getStructure() will retrieve the entire structure for the document.
Calling boReportStructure.getReportElement(0) will retrieve the structure for the first report of the document.
Hope this helps.
Regards,
Dan

I want to create a Ajax based Chating application using java .

hi . I want to create an chating Application , and ajax based chatting application using java as my server side language ..i have some idea about it .. but one thing that i m not understanding is that how i will communicate with other users because each user has its own session so what i will do to send one messge to all the users ???? . i m new to JavaEE and i have chosen this as my semester project .. i need some help regarding this .

First get it working without AJAX.

Socket example using Java 5

Last year I posted 4 programs that provided a simple client server using both stream sockets and NIO. I decided as an exercise in using Java 5 to port that code and try to use as many of the new features as possible. The following code is very long and does what all the previous example programs did. In replies do not repost the whole of this message.
It provides a simple chat like client and server. The user can request either a stream connection or a NIO connection or provide one of their own.
//========================== MsgSwitch.java ===========================//
package pkwnet.msgswitch;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.logging.Handler;
* main class for message switch
* command line arguments are
* -p port number for server
* -s run server
* -a server ip address including port for client
* -i idle timer in seconds
* -n use NIO
* -c specify connection class
public class MsgSwitch {
    static private int errors = 0;
    static private String address = "127.0.0.1:6060";
    static private String connectionClass = "pkwnet.msgswitch.StreamConnection";
    static public void main(String [] args) {
        int port = 6060;
        int idleTime = 600;
        boolean server = false;
        boolean nio = false;
        Logger logger = Logger.getLogger("msgswitch");
        for(String arg : args) {
            if(arg.startsWith("-a")) {
                address = arg.substring(2);
            } else if(arg.startsWith("-p")) {
                port = argToInt(arg);
                server = true;
            } else if(arg.startsWith("-i")) {
                idleTime = argToInt(arg);
            } else if (arg.startsWith("-s")) {
                server = true;
            } else if (arg.startsWith("-c")) {
                connectionClass = arg.substring(2);
            } else if (arg.startsWith("-n")) {
                connectionClass = "pkwnet.msgswitch.NIOConnection";
            } else {
                String err = "unknown argument=" + arg;
                logger.severe(err);
                System.err.println(err);
                errors++;
        if (errors == 0) {
            if (server) {
                new Server().listen(port,idleTime, nio);
            } else {
                new Client().start(address, nio);
        } else {
            fail(errors + " errors encountered", null);
    static private int argToInt(String arg) {
        int val = 0;
        try {
            val = Integer.parseInt(arg.substring(2));
        } catch (NumberFormatException e) {
            String err = "invalid argument format: " + arg;
            Logger.getLogger("msgswitch").severe(err);
            System.err.println(err);
            errors++;
        return val;
    static public void fail(String err, Throwable e) {
        String msg = "Operation terminated: " + err;
        Logger.getLogger("msgswitch").log(Level.SEVERE, msg, e);
        System.err.println(msg);
        System.exit(12);
    static public Connection getConnection() {
        Connection conn = null;
        try {
            conn = (Connection) Class.forName(connectionClass).newInstance();
        } catch (Exception e) {
            fail ("connection class error", e);
        return conn;
    static public void logCaller(Logger logger, Level level) {
        String text = "CALLED";
        if (logger.isLoggable(level)) {
            try {
                throw new Exception("logging stack");
            } catch (Exception e) {
                StackTraceElement [] st = e.getStackTrace();
                if (st.length > 1) {
                    text += formatElement(st[1]);
                if (st.length >2) {
                    text += formatElement(st[2]);
            logger.log(level, text);
    static private String formatElement(StackTraceElement ste) {
        return "\n    " + ste.getClassName() + "." + ste.getMethodName()
            + "(" + ste.getFileName() + ":" + ste.getLineNumber() + ")";
//================= Client.java =============================================//
package pkwnet.msgswitch;
* a simple Swing chat GUI using Java 5 and sockets.
* @author PKWooster
* @version 1.0 August 31,2005
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JMenu;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
import static java.awt.BorderLayout.*;
client GUI class
public class Client extends JFrame implements ConnectionListener {
     // swing GUI components
     private JTextField userText = new JTextField(40);
     private JTextArea sessionLog = new JTextArea(24,40);
     private JTextField statusText = new JTextField(40);
     private JPanel outPanel = new JPanel();
     private JScrollPane sessionLogScroll = new JScrollPane(sessionLog);
     private JMenuBar menuBar = new JMenuBar();
     private JMenuItem startItem = new JMenuItem("Start");
     private JMenuItem hostItem = new JMenuItem("Host");
     private JMenuItem aboutItem = new JMenuItem("About");
     private JMenuItem abortItem = new JMenuItem("Abort");
     private JMenuItem exitItem = new JMenuItem("Exit");
     private JMenu fileMenu = new JMenu("File");
     private JMenu helpMenu = new JMenu("Help");
     private Container cp;
     private String address;
    private Connection connection;
    private boolean sendReady = false;
    private boolean nio = false;
     Client() {
    public void start(String address, boolean nio) {
        this.address = address;
        this.nio = nio;
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                runClient();
    private void runClient() {
        connection = MsgSwitch.getConnection();
        connection.addConnectionListener(this);
          buildMenu();
          cp = getContentPane();
          sessionLog.setEditable(false);
          outPanel.add(new JLabel("Send: "));
          outPanel.add(userText);
          // enter on userText causes transmit
          userText.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent evt){userTyped(evt);}
          cp.setLayout(new BorderLayout());
          cp.add(outPanel,NORTH);
          cp.add(sessionLogScroll,CENTER);
          cp.add(statusText,SOUTH);
          setStatus("Closed");
          addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent evt) {
                mnuExit();
          pack();
        setVisible(true);
* attempt to send the contents of the user text field
    private void userTyped(ActionEvent evt) {
        if (sendReady) {
            String txt = evt.getActionCommand()+"\n";
            userText.setText("");
            toSessionLog("> ", txt);
            sendReady = false;
            connection.send(txt);
* append text to the session log
     private void toSessionLog(String prefix, String txt) {
          sessionLog.append(prefix + txt);
          sessionLog.setCaretPosition(sessionLog.getDocument().getLength() ); // force last line visible
* build the standard menu bar
     private void buildMenu()
          JMenuItem item;
          // file menu
          startItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuStart();}});
          fileMenu.add(startItem);
          hostItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuHost();}});
          fileMenu.add(hostItem);
          exitItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuExit();}});
          fileMenu.add(exitItem);
          menuBar.add(fileMenu);
          helpMenu.add(aboutItem);
          aboutItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuAbout();}});
          menuBar.add(helpMenu);
          setJMenuBar(menuBar);
* start and stop communications from start menu
     private void mnuStart() {
        if(connection.getState() == Connection.State.CLOSED) {
            connection.connect(address);
        } else {
            connection.disconnect();
* prompt user for host in form address:port
    private void mnuHost() {
          String txt = JOptionPane.showInputDialog("Enter host address:port", connection.getAddress());
          if (txt == null)return;
        address = txt;
     private void mnuAbout() {
          JDialog dialog = new JDialog(this, "About Client");
          JTextField text = new JTextField("Simple character client");
        dialog.getContentPane().add(text);
        dialog.pack();
        dialog.setVisible(true);
     // exit menu
     private void mnuExit() {
        exit();
    private void exit() {
          connection.disconnect();
          System.exit(0);
     private void setStatus(String st) {
        statusText.setText(st);
     private void setStatus(Connection.State state) {
        switch(state) {
            case OPENED:
                startItem.setText("Stop");
                setStatus("Connected to "+address);
                break;
            case CLOSED:
                startItem.setText("Start");
                setStatus("Disconnected");
                break;
            case OPENING:
                setStatus("Connecting to "+address);
                startItem.setText("Abort");
                break;
            case CLOSING:
                setStatus("Disconnecting from "+address);
                startItem.setText("Abort");
                break;
    public void stateChanged(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
    public void dataAvailable(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
                String txt = event.getData();
                if (txt == null) {
                    txt = "$null$";
                toSessionLog("< ", txt + "\n");
    public void sendAllowed(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
                sendReady = true;
    public void accept(ConnectionEvent event) {
//========================== Server.java ===============================//
package pkwnet.msgswitch;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
* a simple message switch using stream based socket i/o
* a very simple text message switching program
* user commands start with $ and consist of blank seperated arguments
* other lines sent by the user are forwarded
* $on nickname targets
*    sign on as nickname, sending to targets
* $to targets
*    change target list, reports current value
* $list nicknames
*    list status of specified nicknames
* $list
*    list all connected users
* $off
*    sign off
* @author PKWooster
* @version 1.0 September 1, 2005
public class Server {
    private ConcurrentHashMap<String, User> perUser = new ConcurrentHashMap<String,User>();
    private Timer idleTimer;
    private Connection conn;
    public void listen(int port, final int idleTime, boolean nio) {
        idleTimer = new Timer();
        idleTimer.scheduleAtFixedRate(new TimerTask(){public void run(){oneSec();}},0,1000);
        conn = MsgSwitch.getConnection();
        conn.addConnectionListener(new ConnectionListener() {
            public void stateChanged(ConnectionEvent event) {
            public void dataAvailable(ConnectionEvent event) {
            public void sendAllowed(ConnectionEvent event) {
            public void accept(ConnectionEvent event) {
                Connection uconn = event.getConnection();
                new User(uconn, perUser, idleTime);
        conn.listen(port);
        idleTimer.cancel();
    private void oneSec() {
        Collection<User> uc = perUser.values();
        for(User u : uc) {
            u.oneSec();
//================= User.java ==============================================//
package pkwnet.msgswitch;
import java.io.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
import java.util.logging.Level;
* defines the processing for a message switch user
* @author PKWooster
* @version 1.0 June 15,2004
public class User implements ConnectionListener {
    private ConcurrentHashMap<String, User> perUser;
    private String name;
    private String address;
    private boolean signedOn = false;
    private String[] targets;
    private AtomicInteger remainingTime;
    private int idleTime;
    Connection conn;
    Logger logger;
* construct a user, link it to its connection and put it in the perUser table
    User(Connection conn, ConcurrentHashMap<String,User>p, int idle) {
        this.conn = conn;
        logger = Logger.getLogger("msgswitch.user");
        conn.addConnectionListener(this);
        address = conn.getAddress();
        logger.info("creating user " + address);
        perUser = p;
        idleTime = idle;
        remainingTime = new AtomicInteger(idleTime);
        rename(address);
        targets = new String[0];
* process state changes
    public void stateChanged(ConnectionEvent event) {
        if(event.getState() == Connection.State.CLOSED) {
            close(false);
* data is available, process commands and forward other data.
    public void dataAvailable(ConnectionEvent event) {
        String msg = event.getData();
        if (msg.startsWith("$")) {
            doCommand(msg);
        } else {
            forward(msg);
        remainingTime.set(idleTime);
* do nothing for sendAllowed events
    public void sendAllowed(ConnectionEvent event) {
* do nothing for accept events
    public void accept(ConnectionEvent event) {
* called once per second by the server main thread.
    public void oneSec() {
        if(idleTime != 0 && 1 > remainingTime.decrementAndGet()) {
            close(true);
* send a message
    private void send(String msg) {
        conn.send(msg);
        remainingTime.set(idleTime);
* forward data messages to other users
* @param txt the message to send
    private void forward(String txt) {
        txt = name+": "+txt + "\n";
        if(0 < targets.length) {
            for(String target :targets) {
                User user = perUser.get(target);
                if(user != null) {
                    user.send(txt);
        } else {
            for (User user : perUser.values()) {
                if (user != this) {
                    user.send(txt);
* execute command messages, commands start with a $
* and contain arguments delimited by white space.
* @param command the command string
    private void doCommand(String command) {
        boolean good = false;
        command = command.substring(1).trim();
        if(command.length() > 0) {
            String [] args = command.split("\\s+");
            if(args[0].equals("on")) {
                good = signOn(args);
            } else if(args[0].equals("off")) {
                good = signOff(args);
            } else if(args[0].equals("list")) {
                good = listUsers(args);
            } else if(args[0].equals("to")) {
                good = setTargets(args,1);
            } else if(args[0].equals("idle")) {
                good = setIdle(args);
            if(!good) {
                send("invalid command=" + command + "\n");
* sign on command
    private boolean signOn(String [] args) {
        boolean good = false;
        if(args.length >1) {
            String nm = args[1];
            logger.info("signing on as: " + nm);
            if(rename(nm)) {
                conn.setName(name);
                send("Signed on as " + name + "\n");
                signedOn = true;
                good = true;
                setTargets(args,2);
            } else {
                send("name="+nm+" already signed on\n");
        return good;
* set forwarding targets
    private boolean setTargets(String [] args, int start) {
        if(start < args.length) {
            targets = new String[args.length-start];
            System.arraycopy(args, start, targets, 0, targets.length);
        String str = "to=";
        for(String target : targets) {
            str += (target + " ");
        send(str+"\n");
        return true;
* set idle timeout
    private boolean setIdle(String[] args) {
        try {
            idleTime = new Integer(args[1]).intValue();
            remainingTime.set(idleTime);
            send("idle time set to "+idleTime+"\r\n");
            return true;
        } catch(NumberFormatException exc) {
            return false;
* sign off
    private boolean signOff(String [] args) {
        close(true);
        return true;
* list connected users
    private boolean listUsers(String [] args) {
        TreeSet<String> allUsers = new TreeSet<String>(perUser.keySet());
        HashSet<String> t = new HashSet<String>(Arrays.asList(targets));
        LinkedList<String> users;
        String response = "On,Target,Nickname\n";
        if(args.length < 2) {
            users = new LinkedList<String>(allUsers);
        } else {
            users = new LinkedList<String>();
            for (int i = 1; i < args.length; i++) {
                users.add(args);
for(String username : users) {
if(username.equals(name)) {
response += "*,";
} else {
response += (allUsers.contains(username) ? "y," : "n,");
response += (t.contains(username) ? "y," : "n,");
response += (username + "\n");
send(response);
return true;
* rename this user, first we attempt to add the new name then we remove
* the old one. Both names will be registered for a short while.
* @param newname the new name for this user
* @return true if the rename was successful
private boolean rename(String newname) {
boolean b = false;
logger.info("rename name="+name+" newname="+newname);
if (name != null && name.equals(newname)) {
b = true;
} else if (null == perUser.putIfAbsent(newname, this)) {
if (name != null) {
perUser.remove(name);
name = newname;
b = true;
return b;
* delete from perUser and close our connection
private void close(boolean disconnect) {
logger.info("closing user "+name);
perUser.remove(name);
if (disconnect) {
conn.disconnect();
//====================== Connection.java ===============================//
package pkwnet.msgswitch;
import java.util.HashSet;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
public abstract class Connection {
public enum State {CLOSED, OPENING, OPENED, CLOSING}
private HashSet<ConnectionListener> listeners = new HashSet<ConnectionListener>();
private State state = State.CLOSED;
private String host = "127.0.0.1";
private int port = 6060;
private String name = "unconnected";
public Connection() {
public abstract void listen(int port);
public abstract void connect(String address);
public abstract void disconnect();
public abstract void send(String message);
public void addConnectionListener(ConnectionListener listener) {
listeners.add(listener);
public void removeConnectionListener(ConnectionListener listener) {
listeners.remove(listener);
protected void fireDataAvailable(String data) {
for (ConnectionListener listener : listeners) {
listener.dataAvailable(new ConnectionEvent(this, state, data));
private void fireStateChanged() {
for (ConnectionListener listener : listeners) {
listener.stateChanged(new ConnectionEvent(this, state));
protected void fireSendAllowed() {
for (ConnectionListener listener : listeners) {
listener.sendAllowed(new ConnectionEvent(this, state));
protected void fireAccept(Connection conn) {
for (ConnectionListener listener : listeners) {
listener.accept(new ConnectionEvent(this, conn));
protected void setState(State state) {
if (this.state != state) {
this.state = state;
fireStateChanged();
public State getState() {
return state;
protected void setAddress(String address) {
          int n = address.indexOf(':');
          String pt = null;
setName(address);
if(n == 0) {
               host = "127.0.0.1";
               pt = address.substring(1);
          else if(n < 0) {
               host = address;
               port = 5050;
          } else {
host = address.substring(0,n);
               pt = address.substring(n+1);
if (pt != null) {
try {
port = Integer.parseInt(pt);
} catch (NumberFormatException e) {
port = -1;
public String getName() {
return name;
public void setName(String value) {
name = value;
public String getAddress() {
return host + ":" + port;
public String getHost() {
return host;
public void setPort(int value) {
port = value;
public int getPort() {
return port;
//=================== ConnectionEvent.java ================================//
package pkwnet.msgswitch;
public class ConnectionEvent extends java.util.EventObject {
private final String data;
private final Connection.State state;
private final Connection conn;
public ConnectionEvent(Object source, Connection.State state, String data, Connection conn) {
super(source);
this.state = state;
this.data = data;
this.conn = conn;
public ConnectionEvent(Object source, Connection.State state, String data) {
this(source, state, data, null);
public ConnectionEvent(Object source, Connection.State state) {
this(source, state, null, null);
public ConnectionEvent(Object source, Connection conn) {
this(source, conn.getState(), null, conn);
public Connection.State getState() {
return state;
public String getData() {
return data;
public Connection getConnection() {
return conn;
//============================ ConnectionListener.java ===================//
package pkwnet.msgswitch;
public interface ConnectionListener extends java.util.EventListener {
public void stateChanged(ConnectionEvent event);
public void dataAvailable(ConnectionEvent event);
public void sendAllowed(ConnectionEvent event);
public void accept(ConnectionEvent event);
//============================ StreamConnection.java ===================//
package pkwnet.msgswitch;
import java.net.Socket;
import java.net.ServerSocket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
* provides stream socket i/o of character strings
* @author PKWooster
* @version 1.0 September 1, 2005
public class StreamConnection extends Connection {
private Socket sock;
private BufferedReader in;
private BufferedWriter out;
private Thread recvThread = null;
private Thread sendThread = null;
protected LinkedBlockingQueue<String> sendQ;
Logger logger;
public StreamConnection() {
super();
logger = Logger.getLogger("msgswitch.stream");
sendQ = new LinkedBlockingQueue<String>();
* open a socket and start i/o threads
public void connect(String ipAddress) {
setAddress(ipAddress);
try {
sock = new Socket(getHost(), getPort());
connect(sock);
} catch (IOException e) {
logger.log(Level.SEVERE, "Connection failed to=" + ipAddress, e);
private void connect(Socket sock) {
this.sock = sock;
String ipAddress = getAddress();
try {
in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
out = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()));
recvThread = new Thread(new Runnable() {
public void run() {
doRecv();
},"Recv." + getName());
sendThread = new Thread(new Runnable() {
public void run() {
doSend();
},"Send."+getName());
sendThread.start();
recvThread.start();
setState(State.OPENED);
} catch(IOException e) {
logger.log(Level.SEVERE, "Connection failed to="+ipAddress, e);
public void listen(int port) {
StreamConnection sconn;
setPort(port);
try {
ServerSocket ss = new ServerSocket(port);
while(true) {
Socket us = ss.accept();
sconn = new StreamConnection();
String ipAddress = us.getInetAddress() + ":" + us.getPort();
sconn.setAddress(ipAddress);
sconn.connect(us);
fireAccept(sconn);
} catch(Exception e) {
logger.log(Level.SEVERE, "listen failed", e);
* close the socket connection
public void disconnect() {
logger.fine("disconnect sock=" + sock + " state="+ getState());
if(getState() == State.OPENED) {
setState(State.CLOSING);
try {
sock.shutdownOutput();
} catch(IOException ie) {
logger.log(Level.SEVERE, "showdown failed", ie);
} else if(getState() != State.CLOSED) {
try {
sock.close();
} catch(Exception e) {
logger.log(Level.SEVERE, "close failed", e);
if (sendThread.isAlive()) {
sendThread.interrupt();
sendQ.clear();
setState(State.CLOSED);
public void send(String message) {
if (getState() == State.OPENED) {
try {
sendQ.put(message);
} catch(InterruptedException e) {
logger.log(Level.SEVERE, "sendQ put interrupted", e);
setState(State.CLOSING);
disconnect();
* sets the public name of this connection
public void setName(String name) {
super.setName(name);
if (sendThread != null) {
try {
recvThread.setName("recv." + name);
sendThread.setName("send." + name);
} catch(Exception e) {
logger.log(Level.SEVERE, "nameing threads failed", e);
* the main loop for the send thread
private void doSend() {
String msg;
boolean running = true;
while (running) {
if (sendQ.size() == 0) {
fireSendAllowed();
try {
msg = sendQ.take();
out.write(msg);
out.flush();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "write failed", e);
setState(State.CLOSING);
disconnect();
running = false;
* the main loop for the receive thread
private void doRecv() {
String inbuf;
while (getState() == State.OPENED) {
try {
inbuf = in.readLine();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "readline failed", e);
inbuf = null;
if(inbuf == null) {
logger.fine("null received on: " + getAdd

Here are three of them:
NIO server
NIO client
Multithreaded server
The stream based client example seems to have been deleted, probably lost in the troll wars. I also posted a new Simple multithreaded server that uses the same protocol. As the client is missing, I'll repost it.

How to create and edit a .ini file using java

Hi All...
Pls help me in creating and editing an .ini file using java...
thanks in advance
Regards,
sathya

Let's assume the ini file is a mapping type storage (key=value) so lets use Properties object. (works with java 1.4 & up)
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
public class Test {
     private static Properties props;
     public static void main(String[] args) throws IOException {
          File file = new File("test.ini");//This is out ini file
          props = new Properties();//Create the properties object
          read(file);//Read the ini file
          //Once we've populated the Properties object. set/add a property using the setProperty() method.
          props.setProperty("testing", "value");
          write(file);//Write to ini file
     public static void read(File file) throws IOException {
          FileInputStream fis = new FileInputStream(file);//Create a FileInputStream
          props.load(fis);//load the ini to the Properties file
          fis.close();//close
     public static void write(File file) throws IOException {
          FileOutputStream fos = new FileOutputStream(file);//Create a FileOutputStream
          props.store(fos, "");//write the Properties object values to our ini file
          fos.close();//close
}

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