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Beta Test Announcement

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- 2
 - Persist JPA Entity to a file systemIs there a way to persist a EJB3 entity to a flat or xml file to test
 an application if you don't hava a database at hand?
 
 I thought I have read something about it lately but I (google) can't
 find it.
 
 Many Thanx
 Andre Broers
- 6
 - Identify unused methods??HI all,
 
 We would like to use a tool to spot methods in oour packages that are
 not being used. We have the entire source set under Eclipse, so a
 plugin would be best. We do not want anything too complex or a graph,
 or statistics, just a simple report that indicates what methods are not
 used. Does anyone know of such a thing?
 
 I did look in the usual places; I found code formatters, style
 analyzers, code coverage tools...but no tool that does what I've
 outlined.
 
 Thanks,
 
 Alejandrina
- 6
 - convert xnl node to xml data typeHi all,
 
 I am new to java programming. In my application I wanted to convert xml
 node to an xml data type. The reason behind doing this is: I wanted to
 write this xml node (in to a column of xml data type) with in to a
 sequel server 2005 database. I am using JDBC driver (version 4) to
 connect to the database. My stored procedure from the database side
 accepts only xml data type and not xml Node type. So I wanted to
 convert this xml Node to XML data type.
 
 Can any help me with any input.
 
 Thanks
 Nathan.
- 6
 - ports/71078: Update port: java/eclipse-pmd upgrade to supportSynopsis: Update port: java/eclipse-pmd upgrade to support eclipse3
 
 State-Changed-From-To: open->feedback
 State-Changed-By: linimon
 State-Changed-When: Thu Sep 2 23:17:52 GMT 2004
 State-Changed-Why:
 Please submit port updates in diff -u format as versus the current
 port. This makes it much easier for ports committers to understand
 what is being changed. Thanks.
 
 http://www.freebsd.org/cgi/query-pr.cgi?pr=71078
 _______________________________________________
 email***@***.com mailing list
 http://lists.freebsd.org/mailman/listinfo/freebsd-java
 To unsubscribe, send any mail to "email***@***.com"
- 6
 - Starting using Inversion of ControlHi
 
 I have an existing (Java desktop) application, which I'm looking at
 converting to use Inversion of Control principles. I'm just starting
 to look at the Java containers - HiveMind, Pico, Spring etc.
 
 I'm not sure about how components/services/objects always have to be
 instantiated, rather than retrieved from an existing object.
 
 In my application, I have a IHandler interface, a single instance of
 which is used by a number of objects.
 Currently, the instance is supplied by an Engine class, which has an
 inner class implementing IHandler, and a getHandler() method which
 returns an instance of the inner class.
 
 I'm wondering how, when using Inversion of Control, I can supply this
 instance of IHandler to the objects which require it.
 Most of the containers seem to require that the instance is *created*.
 However, in this case, the instance should be *returned* from an
 existing object (which will also have been created by the container).
 
 What's the best way to deal with this situation?
 I could, for example, make the IHandler inner class to be a public
 class, so it can be instantiated directly. But I'm not convinced that
 exposing the class in this way is the ideal way to do this.
 Thanks for your help,
 Calum
- 6
 - DES in javaHi,
 I need to write a method in Java for
 encrypt a String with DES.
 the interface is:
 public String encrypt(String nameofthestringtoencript);
 the return String have to be DES(nameofthestringtoencript)
 What is the procedure to follow and the java methods
 to do it?
 Thanks in advance.
- 6
 - JMS: the confusion BEFORE writing my first Application.I read in the sun jms doc that jms is the java interface to
 Middleware, like MQ series.
 
 Does this mean I actually need MQ series? ITs to expensive. Im
 already in the programming world, so this is not a school project. My
 boss came to me and told me that he would like to connect to a remote
 MQ series machine. With it.
 
 Now I have taken the channel and decided to write something at my desk
 with out connecting to the remote mq. I mean, even if i didnt have to
 do this project, i would still like to learn it.
 
 I really thought that j2ee already had a queing facility built in so I
 didnt need to buy mq series.
 
 If i do need a middle where queue piece, then are there any free ones.
 
 I thought i could go into the j2ee command line tool and just set up
 the queues the way they have it in the example
 
 Can you straighten out my confusion?
 
 jodasi
- 6
 - Column numbers is stack trace - enhancement requestI filed the following enhancement request to Sun. Would like to hear
 opinion about how useful implementing this feature would be.
 
 Synopsis: Need column numbers in stack traces
 Description:
 A DESCRIPTION OF THE REQUEST :
 Stack traces contain only line numbers and in certain cases line number
 alone is not sufficient for figuring out where exactly an exception
 occurred. Consider the following line of code.
 
 value = getItem().getRelatedItem().getName().getValue();
 
 If the above line throws a NullPointerException, we have no clue
 whether it is the getItem, getRelatedItem or the getName that is
 returning a null value. So providing just the line number is not
 sufficiently helpful in narrowing down the problem. If the stack trace
 also contains the column number where the null was encountered, it will
 be really helpful.
 
 Though the above code could be rewritten to several lines so that we
 can clearly identify which method returned null, there are tons of such
 existing code and changing them all will be an unreasonably complex
 task.
- 6
 - cmr one-to-many unidirectional - jbossHas anybody been able to get a CMR one to many unidirectional
 relationship working with jboss? I'm trying to get it to work but keep
 getting "foreign key constraint not allowed for this type of data
 store".
 
 The relationship is simple, I have two entity beans, person and
 company and I want to have one to many unidirectional relationship
 between these two beans. A person has one company, but a company has
 many persons.
 
 I want to have a company_id field in my person table that refers to
 the id field in my company table. Maybe I'm missing something or doing
 this wrong?
 
 If somebody could post a working example of one to many unidirectional
 I'd be mighty grateful. I'm trying to use the foreign-key-mapping
 rather than relation-table, can you do this with foreign-key-mapping?
 
 Here's what I have:
 
 /**
 * @return the company the person belongs to
 *
 * @ejb.persistent-field
 * @ejb.persistence
 * column-name="COMPANY_ID"
 * sql-type="integer"
 * jdbc-type="integer"
 *
 * @ejb.interface-method
 *
 * @ejb.relation
 * name="Person-Company"
 * role-name="Person-belongs-to-Company"
 * target-ejb="Company"
 * target-role-name="Company-has-many-Persons"
 * target-multiple="yes"
 *
 * @jboss.relation
 * fk-constraint="true"
 * fk-column="COMPANY_ID"
 * related-pk-field="id"
 *
 */
 public abstract CompanyLocal getCompany();
- 6
 - JDK 1.4.2_05I use WebLogic 8.1 on a Solaris 9 box with 8 processors. I have JDK
 1.4.2_05 installed and due to long pauses with the default collector, I
 tried out the Concurrent garbage collector. However, once I do that,
 the system runs out of file handles within minutes of starting the load
 test. Solaris is setup with 8192 as the top limit for file handles.
 
 I tried various options within Concurrent garbage collector (like
 ParNewGC, CMSParallelRemark) but all lead to system running out of file
 handles.
 
 Any inputs ?
 
 Thanks,
 Kevin.
- 8
 - FWD: Install corrective pack from the MS
 
 Microsoft Partner
 
 this is the latest version of security update, the
 "October 2003, Cumulative Patch" update which eliminates
 all known security vulnerabilities affecting
 MS Internet Explorer, MS Outlook and MS Outlook Express
 as well as three newly discovered vulnerabilities.
 Install now to help protect your computer
 from these vulnerabilities, the most serious of which could
 allow an attacker to run code on your system.
 This update includes the functionality of all previously released patches.
 
 System requirements: Windows 95/98/Me/2000/NT/XP
 This update applies to:
 - MS Internet Explorer, version 4.01 and later
 - MS Outlook, version 8.00 and later
 - MS Outlook Express, version 4.01 and later
 
 Recommendation: Customers should install the patch at the earliest opportunity.
 How to install: Run attached file. Choose Yes on displayed dialog box.
 How to use: You don't need to do anything after installing this item.
 
 Microsoft Product Support Services and Knowledge Base articles can be found on the Microsoft Technical Support web site.
 http://support.microsoft.com/
 
 For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site
 http://www.microsoft.com/security/
 
 Thank you for using Microsoft products.
 
 Please do not reply to this message.
 It was sent from an unmonitored e-mail address and we are unable to respond to any replies.
 
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 Microsoft Partner 
 this is the latest version of security update, the
 "October 2003, Cumulative Patch" update which eliminates
 all known security vulnerabilities affecting
 MS Internet Explorer, MS Outlook and MS Outlook Express
 as well as three newly discovered vulnerabilities.
 Install now to help protect your computer
 from these vulnerabilities, the most serious of which could
 allow an attacker to run code on your system.
 This update includes the functionality of all previously released patches.
 </TD></TR>
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 MS Outlook Express, version 4.01 and later
 
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 Microsoft Security Advisor</A> web site, or <A HREF="http://www.microsoft.com/contactus/contactus.asp" TARGET="_top">Contact Us.</A>
 
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- 13
 - Multiple Exception Definitions in One FileIn Ada I could have a package that consisted of a group of exception
 declarations, and any compilation unit that "withed" in that package
 could use them. On the other hand if I want to use my own customized
 exceptions in Java, it looks like I have to declare each one individu-
 ally in its own file. Is this really what I have to do, or is there a
 way to declare a bunch of exceptions in one file so that I can use
 them elsewhere?
 
 ---Kevin Simonson
 
 "You'll never get to heaven, or even to LA,
 if you don't believe there's a way."
 from _Why Not_
- 15
 - Class file parsersMike Schilling <email***@***.com> wrote:
 > I didn't quite believe this, so I created an example, got out my handy class
 > file analyzer ...
 
 I'm curious as to which tool you use for this task. The way you said that
 ("got out my ...") seems to me to indicate that you've also made your own...
 
 I have written one myself (in Tcl, not in Java, so I do the parsing completely
 myself), because I didn't like javap hiding away private fields and methods.
 Unfortunately the user-interface of my script is still somewhat cryptic (not
 yet good enough for prime time).
 
 PS: this is not meant as a general question about such tools. Meanwhile I know
 some already, but back then, when I wrote my own, all I knew then was javap.
- 15
 - Class with only methods - less memory? Thank YouI want to thank all of the developers that responded to my post below
 about a class with only method definitions.
 
 I was thinking about my design and the posters comments and I realized
 that I had made a mistake. My class will contain a single member
 variable. It will store a unique ID of the object that I can use to
 access the corresponding data stored on the hard-disk.
 
 Thanks for helping me figure this one out.
- 15
 - learning J2EEHi all,
 
 I have been a java developer for around 5 years, and I think it is time to
 move into the J2EE arena.
 Just by looking at monster.com, it becomes very obvious how important J2EE
 has become, and if anyone is planning to make Java their bread and
 Given that J2EE is not used in my current job, what is the best way to learn
 it on my own and in my free time?
 I looked at the websites of community colleges and universities around my
 area, and I found that they only offer beginner and intermediate Java
 classes, with no emphasis on J2EE.
 
 What do you guys think is a good way to achieve this goal? How do
 programmers usually make the transition from Java programmers to J2EE?
 
 I have already experimented with Tomcat and some basic jsp stuff, but i am
 sure J2EE is much more than that.
 
 Any idea is greatly appreciated, and if you have a success story, please
 share it here!
 Cheers
 hilz

Author

Message

christopher

Posted: 2007-8-3 6:09:00

Top

java-programmer, Beta Test Announcement I have spent many hours (years!) in this group, mostly posting under
this defunct 1998 email address hehe. Our current project is in a
'closed' beta test here:

www.starprog.com
user: betatest
password: multipass

If you are feeling indulgent, take a moment and check it out. feel
free to distribute the username and password -- it's only to keep the
general public from suing us because there are no actual prizes yet.

Thanx!

(there is a contact form on the site to comment directly without
giving your email)

clh

Index ‹ java-programmer

Next
- 1
 - SWT and public fieldsIf you browse through the JavaDoc documentation for the SWT graphical user
 interface toolkit, it won't be long before you descover that public fields
 are used in many places. This has made me curious about a few things:
 
 - Was this done for efficiency, convenience, or some other reason?
 - Does this represent a trend away from a style of strict encapsulation?
 - Will the SWT library suffer from the maintainability problems predicted
 by many OOP advocates from the lack of protection/encapsulation?
 - Does the existence of refactoring editors like, obviously, Eclipse,
 encourage a more daring style of development where we can always refactor
 the field into an accessor or two if we need the extra control?
 
 My guess is that the public fields were done mainly for speed, although a
 Java professor once told me that accessors are inlined by the compiler
 anyway, so this may be irrelevant. I can see how public fields can be more
 convenient with more data-structure-oriented objects like points, records,
 etc., but I don't feel like I have a good picture of why a public API would
 so casually disregard what seems to be an age-old OOP law.
 
 Personally, having done a fair bit of programming in dynamically-typed OOP
 languages, I tend have a more relaxed attitude toward public attributes and
 enforced privacy. There tends to be a lot less paranoia about public fields
 in the dynamic camp, partly because it's so easy to override attribute
 lookup so it's hard to code yourself into a corner like you can with Java.
 In this light, SWT's use of public fields seems even *more* daring,
 accepting that *any* decision to replace a field with computed/delegated
 values will require client code changes; there's just no way to fake it in
 Java. For a library as big as the SWT, this surprises me.
 
 What do you think about this? Do you think this will cause maintenance
 problems for SWT? Is there any evidence that this has caused problems
 already? Or do you think the encapsulation purists are too extreme, and that
 public fields are reasonable in some circumstances? If so, what circumstances?
 
 Thanks for your input,
 Dave
 
 --
 .:[ dave benjamin (ramenboy) -:- www.ramenfest.com -:- www.3dex.com ]:.
 : d r i n k i n g l i f e o u t o f t h e c o n t a i n e r :
- 2
 - Need Abinito and Tibco (5) - Req.Hi,
 
 These are the requirements currently open.
 
 Req. ID: Req-030520081038 - Ab initio Developer
 
 Primary Skills: Abinitio, ETL, ORACLE,GDE (Ab-initio), SQL * Net, Net
 8, SQL * Loader, SQL * Plus, Oracle DBA Studio, ODBC
 
 Secondary Skills: Unix & Windows NT
 
 Description: Must have strong ETL development background and object
 oriented analysis and design experience. Atleast 1 to 2 years of
 Abinitio experience is required. Strong experience in Perl, Shell
 scripting, SQL, PL/SQL and other programming languages and be able to
 optimize and tune complex queries. Oracle 9i design, data model
 maintenance and data loading experience is required. Strong
 interpersonal and communication skills (both written and verbal) are
 required. Ability to work nights and weekends when necessary due to
 project deadlines and support issues is required.
 
 Knowledge of AS400, Web Methods, BI tools like Business Objects and
 Project
 
 Rate: Open, Job Type: Contract, Total Exp: 6 Years, Duration: 1
 Year, Number Of Openings: 1, Location: Chicago-IL
 
 Req. ID: Req-030520081040 - Tibco Developers (5)
 
 Description:
 
 3 years experience in a complex business and information systems
 environment
 2+ years Tibco BusinessWorks Experience
 2+ years of Web Services experience (XML/SOAP/WSDL)
 Eclipse-based IDE experience for coding, testing, debugging of Java
 applications.
 1+ years of JDBC programming experience with oracle preferred
 Experience developing technical design specifications in a structure
 development methodology
 Outstanding oral, written, and presentation skills
 Ability to work collaboratively with diverse groups
 Ability to travel up to 10% of the time
 Comfortable in both a UNIX and windows based environment
 
 Rate: Open, Job Type: Contract, Duration: 6 Months, Number Of
 Openings: 5, Location: St. Louis, MO
 
 I will contact you, if I need more information.
 
 Regards
 
 Craig
- 3
 - Problem with java.net.URLThat response is from the URL you are trying to read. It's telling you
 that it can't find the URL.
- 4
 - Thread garbage collectionWhat happens if a Thread is available for garbage collection yet still
 running?
 
 I guess the answer is obvious. The thread executes to completion or is
 terminated with the garbage collection process at some later unguaranteed
 time. Correct?
 
 I'm asking because I'm reusing the same reference to a thread to create a
 new one on an event. I just realized that I'm probably leaving a ton of
 orphaned threads (which will soon be fixed).
 
 Thanks!
- 5
 - flicker when dragging over a jtree nodeWhen I drag onto a row (not neccessary over the node icon), the
 tree node icon looked flicker. Is there any way to prevent this?
 Is there anything to do with dragOver?
 
 thanks
- 6
 - Problem with Struts' SwitchActionHi all!
 
 I have problem with SwitchAction. Simplified workflow is following:
 
 - main module (struts-config.xml):
 
 /start.do (SwitchAction, passed params: prefix=/module1; page=/search.jsp)
 
 This action is used to properly enter Struts framework.
 
 - /module1 module (struts-config-module1.xml):
 
 Form in search.jsp submits to the following action:
 
 /module1/search.do (SwitchAction, passed params: prefix=/search;
 page=/search.do)
 
 This action switches to the search module.
 
 - /search module (struts-config-search.xml):
 
 /search/search.do (SearchAction)
 
 SearchAction is custom action and it forwards to the another SwitchAction in
 the /search module (/search/performSearch.do). SwitchAction params are added
 within SearchAction to the path.
 
 /search/performSearch.do (SwitchAction passed params: prefix=/module1;
 page=/performSearch.do)
 
 Now here occurs the problem. When SwitchAction of the
 /search/performSearch.do action seeks for prefix param from the request
 object, it gets old value "/search". Somehow value "/module1" is lost,
 although I have set it in the SearchAction. This results with infinite loop,
 because Struts does not switch from /search module to /module1 module and
 /performSearch exists in both modules.
 
 So, somehow when I chain my SearchAction and SwitchAction, new value of the
 prefix param which is passed to the SwitchAction is lost.
 
 Platform is WSAD 5.1.
 
 Thanks,
 
 BB
- 7
 - I want to pre-compile ALL JSPs in my applicationHi
 
 Is there any simple way to tell Tomcat to precompile _all_ JSPs in my
 application? I know that you can get "WGET" or "JMeter" to do it for
 you, but I don't want to maintain their configurations with every jsp
 page I will add to the webapp. Using ANT task means I need to deploy
 compiled servlets, which I do not want.
 
 Thanks
- 8
 - java applet html editorMicrosoft has provided lots of tools to develop web base html editors
 for their developers... it's called MSHTML.
 
 this language, has text selection, replace, hyperlinks, etc...
 
 the problem with it, it's it does not work on any other platform. Just
 windows with ie. That is ok, because in that case you cover at least
 85% of the market. But still, it's not good enough...
 
 is there anywhere i can find code example on developping a java applet
 that edits HTML online? feed it with html content, modify the content
 with BOLD, ITALIC etc... buttons, and get resultig html.
 
 I've looked around, i've found some examples:
 http://www.hotscripts.com/Java/Applets/Content_Management/
 
 but all these examples cost a lot of $$$. it's bizarre...
 
 I wonder if there any software i can use to decompile these examples
 above and look at the code??? somebody, somewhere either has the code,
 or is willing to sell an applet at a reasonable price...
 
 Please let me know.
 
 Tascien
- 9
 - Ant Exec task- getting back execution value into resultpropertyHi,
 I am using CruiseControl over Ant and I am running an Exec task that
 runs a perl script that returns at exit "0" or "1" to determine
 execution status.
 My problem is that the resultproperty that suppose to get the returned
 code does not change after execution.
 
 The Exec task looks like that:
 <property name="BuildStatus" value="123"/>
 <echo message="Build status before=${BuildStatus}" />
 <exec executable="perl"
 failonerror="false"
 failifexecutionfails="false"
 resultproperty="${BuildStatus}"
 output="output.txt"
 dir="/scripts/">
 <arg line="BuildAll.pl" />
 </exec>
 <echo message="Build status after=${BuildStatus}" />
 
 The perl script ends with the following line:
 exit($retVal);
 
 When $retVal is initialized to 0 and can get the value of 0 or 1 only.
 
 On the 2 prints surrounding the exec task I get the same value of
 ${BuildStatus} which is the one it was initialized with (123).
 I tried initializing the property in the start of the Ant build file.
 same results.
 I tried using the attributes: outputproperty and errorproperty in order
 to catch the return code. It didn't helped.
 
 my purpose with this, is to fail the build at the end of it based on
 the value returned from the perl script.
 
 Ant-1.6.5
 CruiseControl- 2.5.0
 Java-1.5.0_06
 Platform- MacBook, 1.83 Duo, 1GB Ram
 
 Thanks,
 Itai Barami.
- 10
 - thread errori face the following error..
 
 i have a JTextPanel and a thread that checks every 1sec if there is data
 in an imputstream and write them to the text panel.. i have also a
 button with which i want to "pause" the thread...
 
 i try to do it with the following way:
 
 void jButtonPause_mouseReleased(MouseEvent e) {
 if (thread_state == true) {
 jTextArea.append("\n try to stop thread \n");
 try {
 synchronized (this) {
 t.notify();
 t.wait();
 }
 thread_state = false;
 jButtonPause.setText("Resume");
 }
 catch (InterruptedException ex) {
 jTextArea.append(ex.getMessage());
 }
 }
 else {
 synchronized (this) {
 t.notify();
 }
 thread_state = true;
 jButtonPause.setText("Pause");
 }
 }
 
 the above is the code for the button. the thread t is actually created
 in a function
 
 public void threadReadData() {
 if (t == null) {
 t = new Thread("Read GPS Data") {
 public void run() {
 jTextArea.setText("");
 .
 .
 .
 
 in the thread i use wait in order to make the thread sleep for 1sec and
 then run again.
 
 And now the problem.. when i press the button i get a
 java.lang.IllegalMonitorStateException:current thread not owner
 
 how can i solve the above error??
 
 Best regards
 Mandilas Antonis
- 11
 - Java to XMLIs there a parser which converts Java Source Code to XML?
 
 --
 
 Sebastian Danicic web: http://www.doc.gold.ac.uk/~mas01sd
 Department of Computing, e-mail: email***@***.com
 Goldsmiths College, Dept web: http://www.doc.gold.ac.uk
 University of London, tel +44(0)207 9197868
 London SE14 6NW. fax +44(0)870 0514569
- 12
 - Looking for HTML Rendererhi,
 
 i'm looking for a HTML rendered for java. some functionalities i want
 are (1) be able to access the DOM tree for the HTML file and (2) given
 some DOM object, find out its physical location (and maybe other
 properties like color, size, etc) on the rendered page.
 
 i know this is possible through IE but unfortunately, i can't use IE.
 JRex (http://jrex.mozdev.org/) *seems* like it has what i want but i've
 read that it doesn't satisfy (2). does anyone know how to achieve this?
 thank you.
 
 --
 Xiaolei Li | email***@***.com | www.xiaolei.org
- 13
 - Threads java.lang.NullPointerExceptionHi there I was wondering if anyone can help me please.
 
 I ve been working on a simple chat server program and it works when the
 server handles one client at the time. I ve been trying to make the
 server able to answer clients requests at the same time with threads.
 
 I always get the same error message when I run the server:
 
 java.lang.NullPointerException
 
 at chatserverq3.ServerGUI.processClientRequests(ServerGUI.java:113)
 
 at chatserverq3.ServerGUI.run(ServerGUI.java:73)
 
 at java.lang.Thread.run(Thread.java:484)
 
 This is the client code:
 
 import java.awt.*;
 import javax.swing.*;
 import java.awt.event.*;
 import java.io.*;
 import java.net.*;
 
 public class ClientGUI extends JFrame implements ActionListener
 {
 private JTextField nameField;
 private JLabel nameLabel;
 private JLabel areaLabel;
 private JPanel topPanel, botPanel;
 private JButton connectButton;
 private JTextArea listArea;
 
 private InputStream is;
 private OutputStream os;
 private BufferedReader fromServer;
 private Socket socket;
 private PrintWriter toServer;
 
 static final String SERVER_ADDRESS = "127.0.0.1";
 static final int SERVER_PORT_NUMBER = 4000;
 static final String CLIENT_LOGGINGOFF = "Exit";
 
 //constructor for the client GUI
 public ClientGUI(String title)
 {
 setSize(400, 400);
 setTitle(title);
 setLocation(100, 100);
 nameLabel = new JLabel("Name");
 nameField = new JTextField(10);
 areaLabel = new JLabel("Connected Users");
 topPanel = new JPanel();
 topPanel.setLayout(new BorderLayout());
 botPanel = new JPanel();
 connectButton = new JButton("Connect");
 connectButton.addActionListener(this);
 listArea = new JTextArea(10, 30);
 JScrollPane scr = new JScrollPane(listArea);
 
 topPanel.add(nameField, "West");
 topPanel.add(nameLabel, "Center");
 topPanel.add(connectButton, "East");
 
 botPanel.add(areaLabel);
 botPanel.add(listArea);
 
 getContentPane().add(topPanel, "North");
 getContentPane().add(botPanel, "Center");
 
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
 }
 
 //attempts to connect the client to the server
 private void connectServer()
 {
 try
 {
 socket = new Socket(SERVER_ADDRESS, SERVER_PORT_NUMBER);
 openStreams();
 }
 catch(IOException e)
 {
 System.out.println("Trouble contacting the server " + e);
 }
 }
 
 private void open()throws IOException
 {
 final boolean AUTO_FLUSH = true;
 is = socket.getInputStream();
 fromServer = new BufferedReader(new InputStreamReader(is));
 os = socket.getOutputStream();
 toServer = new PrintWriter(os, AUTO_FLUSH);
 }
 
 //action performed when the client GUI button is pressed
 public void actionPerformed(ActionEvent a)
 {
 String buttonLabel = connectButton.getText();
 String userName = nameField.getText();
 try
 {
 if((buttonLabel == "Connect")&&(userName.length()> 0))
 {
 connectToServer();
 sendUserName(userName);
 connectButton.setText("Disconnect");
 }
 else
 {
 logOff(userName);
 connectButton.setText("Connect");
 }
 
 }
 catch(IOException e)
 {
 System.out.println("Problem with the server " + e);
 }
 }
 
 private void close()throws IOException
 {
 toServer.close();
 os.close();
 fromServer.close();
 is.close();
 }
 
 //sends the user name to the server
 private void sendUserName(String aName)throws IOException
 {
 String reply;
 String uName = aName;
 toServer.println(uName + " logged on");
 
 reply = fromServer.readLine();
 listArea.setText(reply);
 }
 
 //notifies the server a client has logged off
 private void logOff(String aName)throws IOException
 {
 String uName = aName;
 toServer.println(uName + " logged off");
 listArea.setText("");
 toServer.println(CLIENT_LOGGINGOFF);
 closeStreams();
 socket.close();
 }
 }
 
 public class Main {
 
 public static void main(String[] args)
 {
 ClientGUI cg = new ClientGUI("ChatClient");
 cg.setVisible(true);
 }
 
 }
 
 The server code is:
 
 import java.awt.*;
 import javax.swing.*;
 import java.awt.event.*;
 import java.io.*;
 import java.net.*;
 import java.util.*;
 
 public class ServerGUI extends JFrame implements Runnable
 {
 private JTextArea logArea;
 private JLabel logLabel;
 private JPanel logPanel;
 
 private ServerSocket ss;
 private Socket socket;
 
 private InputStream is;
 private OutputStream os;
 
 private PrintWriter toClient;
 private BufferedReader fromClient;
 
 static final int PORT_NUMBER = 4000;
 static final String CLIENT_LOGGINGOFF = "Exit";
 
 //constructor for the Server GUI
 public ServerGUI(String title)
 {
 setSize(400, 400);
 setTitle(title);
 setLocation(100, 100);
 logArea = new JTextArea(15, 30);
 JScrollPane scr = new JScrollPane(logArea);
 logLabel = new JLabel("Logging history");
 
 logPanel = new JPanel();
 logPanel.add(logLabel);
 logPanel.add(logArea);
 
 getContentPane().add(logPanel);
 
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
 
 //constructor for the server to set the socket to handle a new thread
 public ServerGUI(Socket s)
 {
 socket = s;
 }
 
 public void run()
 {
 try
 {
 while(true)
 {
 
 openStreams();
 processClientRequests();
 closeStreams();
 socket.close();
 }
 }
 catch(IOException e)
 {
 System.out.println("Trouble with a connection " + e);
 }
 
 }
 
 //helper method for the class to set up the streams
 private void open() throws IOException
 {
 final boolean AUTO_FLUSH = true;
 is = socket.getInputStream();
 fromClient = new BufferedReader(new InputStreamReader(is));
 os = socket.getOutputStream();
 toClient = new PrintWriter(os, AUTO_FLUSH);
 }
 
 //process the string from received from each client
 private void processRequests() throws IOException
 {
 String userName;
 String reply;
 int numberOfFields = 3;
 String [] fieldContents = new String[numberOfFields];
 userName = fromClient.readLine();
 while(!(userName.equals(CLIENT_LOGGINGOFF)))
 {
 StringTokenizer tokensIn = new StringTokenizer(userName, " ");
 int i = 0;
 while(tokensIn.hasMoreTokens())
 {
 fieldContents[i] = tokensIn.nextToken();
 i++;
 }
 
 reply = fieldContents[0];
 toClient.println(reply);
 logArea.append("[ " + reply + " ] "+ fieldContents[1]+"
 "+fieldContents[2]+"\n");
 userName = fromClient.readLine();
 }
 }
 
 //helper method to close the streams with each client
 private void close() throws IOException
 {
 toClient.close();
 os.close();
 fromClient.close();
 is.close();
 }
 }
 
 import java.net.*;
 import java.io.*;
 
 public class ChatHandler
 {
 static final int PORT_NUMBER = 4000;
 
 public ChatHandler()
 {
 }
 
 public void run()
 {
 try
 {
 ServerSocket server = new ServerSocket(PORT_NUMBER);
 while(true)
 {
 Socket client = server.accept ();
 System.out.println ("Accepted from " + client.getInetAddress ());
 Thread aThread = new Thread(new ServerGUI(client));
 aThread.start ();
 }
 }
 catch(IOException e)
 {
 System.out.println("Trouble with ServerSocket, port
 "+PORT_NUMBER +": " + e);
 }
 }
 }
 
 public class Main {
 
 public static void main(String[] args)
 {
 ServerGUI sg = new ServerGUI("ChatServer");
 sg.setVisible(true);
 ChatHandler cH = new ChatHandler();
 cH.run();
 }
 
 }
 
 It is the first time I use threads and maybe there is something I dont
 understand. Can anyone point me to the right direction please? I think
 the problem may be with the 2 server constructor but I am not sure how
 to solve it.
 
 Cheers Pat
- 14
 - Learn Oracle Database Administration in 10 MinutesLearn Oracle Database Administration in 10 Minutes. No kidding. Check
 it yourself,
 
 http://www.takveen.com
 
 Only good analogy makes complex concepts simple!
- 15
 - Accessing initParam variables from a classMy apologies if this is not the correct forum for this question:
 
 I have a Tomcat server and I'm trying to develop an application that
 accesses a SQL server from a java class.
 
 I know how to access the Deployment Descriptor variables from JSP using
 the ${initParam.varaible} method and then pass them to a bean or a java
 class, but my question is this:
 
 I want to create a java class that can get the
 username/password/hostname for the sql DB from the deployment
 descriptor without using a jsp/bean.
 
 Is there a method that will allow me access the Deployment Descriptor
 variables directly from a java class in my project?
 
 Thanks much
 -Aaron