Retrieving images for a java game

i am currently trying to make a game whereby i have to retrieve images from a file and display it to the screen. I am able to do this using applets but the game i am implementing does not use applets - it only makes use of awt and swing components. any advice given would be gretly appreciated as i have been trying to do this for days now!

Ive read all the tutorials and it still wont work. Ive tried both the
ImageIcon anIcon=new ImageIcon("image.jpg");
and the
Image image = Toolkit.getDefaultToolkit().getImage("blah.gif" );
I was wondering could it be something to do with XP or the java compiler im using?im using Forte for Java v3.The code complies fine but when i run it nothing appears!

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Lao Bo,
yes, you can locate and copy a file from your HD to a USB key using UNIX commands. If you know the exact name of the file which you’re trying to locate, try this:
find / -iname filename -print
This command will search your entire internal disk for the particular filename. If you know that it’s within a particular user account, then you can save search time with this variation:
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Either variation of this command will print all files found which have the given filename. Presuming that you’re able to identify the correct file, you can copy it to a USB key using the command
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Please let me know if you have any trouble with these commands.

Help on moving of image across screen(java application,not applet)

I've searched the entire internet and everything I've found is on java applets and I'm an alien to the differences between an applet and an application.
This is actually for a java game I'm creating using Eclipse's visual editor and I'm failing miserably.
What I'm trying to do is to find some java source code that enables me to start an image automatically moving across the screen that only stops when I click on it. I did find some applet codes but when I tried converting it to application code a load of errors popped out.
Thanks for the help if there's any! I'm getting desperate here because the game's due this friday and I'm stuck at this stage for who knows how long.

Here is one of the codes I found ,it's not mine but I'm trying to edit it into a java application instead of an applet...Sort of like: ' public class MovingLabels extends JFrame ' or some code that I can copy and paste into another java program.
* Swing version.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MovingLabels extends JApplet
implements ActionListener {
int frameNumber = -1;
Timer timer;
boolean frozen = false;
JLayeredPane layeredPane;
JLabel bgLabel, fgLabel;
int fgHeight, fgWidth;
int bgHeight, bgWidth;
static String fgFile = "wow.gif";
static String bgFile = "Spring.jpg";
//Invoked only when run as an applet.
public void init() {
Image bgImage = getImage(getCodeBase(), bgFile);
Image fgImage = getImage(getCodeBase(), fgFile);
buildUI(getContentPane(), bgImage, fgImage);
void buildUI(Container container, Image bgImage, Image fgImage) {
final ImageIcon bgIcon = new ImageIcon(bgImage);
final ImageIcon fgIcon = new ImageIcon(fgImage);
bgWidth = bgIcon.getIconWidth();
bgHeight = bgIcon.getIconHeight();
fgWidth = fgIcon.getIconWidth();
fgHeight = fgIcon.getIconHeight();
//Set up a timer that calls this object's action handler
timer = new Timer(100, this); //delay = 100 ms
timer.setInitialDelay(0);
timer.setCoalesce(true);
//Create a label to display the background image.
bgLabel = new JLabel(bgIcon);
bgLabel.setOpaque(true);
bgLabel.setBounds(0, 0, bgWidth, bgHeight);
//Create a label to display the foreground image.
fgLabel = new JLabel(fgIcon);
fgLabel.setBounds(-fgWidth, -fgHeight, fgWidth, fgHeight);
//Create the layered pane to hold the labels.
layeredPane = new JLayeredPane();
layeredPane.setPreferredSize(
new Dimension(bgWidth, bgHeight));
layeredPane.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (frozen) {
frozen = false;
startAnimation();
} else {
frozen = true;
stopAnimation();
layeredPane.add(bgLabel, new Integer(0)); //low layer
layeredPane.add(fgLabel, new Integer(1)); //high layer
container.add(layeredPane, BorderLayout.CENTER);
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public void start() {
startAnimation();
//Invoked by the applet browser only.
public void stop() {
stopAnimation();
public synchronized void startAnimation() {
if (frozen) {
//Do nothing. The user has requested that we
//stop changing the image.
} else {
//Start animating!
if (!timer.isRunning()) {
timer.start();
public synchronized void stopAnimation() {
//Stop the animating thread.
if (timer.isRunning()) {
timer.stop();
public void actionPerformed(ActionEvent e) {
//Advance animation frame.
frameNumber++;
//Display it.
fgLabel.setLocation(
((frameNumber*5)
% (fgWidth + bgWidth))
- fgWidth,
(bgHeight - fgHeight)/2);
//Invoked only when run as an application.
public static void main(String[] args) {
Image bgImage = Toolkit.getDefaultToolkit().getImage(
MovingLabels.bgFile);
Image fgImage = Toolkit.getDefaultToolkit().getImage(
MovingLabels.fgFile);
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JFrame f = new JFrame("MovingLabels");
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movingLabels.stopAnimation();
public void windowDeiconified(WindowEvent e) {
movingLabels.startAnimation();
public void windowClosing(WindowEvent e) {
System.exit(0);
movingLabels.buildUI(f.getContentPane(), bgImage, fgImage);
f.setSize(500, 125);
f.setVisible(true);
movingLabels.startAnimation();
}

Need some OO design pointers for a Java card game I wrote for uni

Hi,
I hope a few of you Java sifus can help me understand I dilemma I keep finding myself in.
I created a card game for a university assignment which works great but its not very OO at the moment.
I only have 3 classes; a Card class, a Deck class and a Game class which contains all my GUI, AI, Game Controller, Player and Hand code.
The assignment is over but I feel like enhancing the game, adding animation, multiplayer, several AI agents etc.
The first thing I have attempted is animation and I've hit a brick wall. I am trying to create animation for my card game whereby I have an animation showing the cards being shuffled and then an animation which shows the cards being dealt to the players. The game then commences. The cards on the GUI then need to be clickable (MouseListeners?) to play the game. If you're running Windows 7, load up 'Hearts' and you'll know what I'm trying to achieve.
I don't understand how the GUI, and Card class need to be seperated so that its good OO.
If I give you a few snippets of code, it might explain the situation:
A snippet of my card class is as follows:
import javax.swing.*;
public class Card extends JLabel //Each card is a JLabel
     private int value;                    //variable for the value of the card
     private int suit;                         //variable for the suit of the card
     private ImageIcon frontOfCard;     //Displays the image of the front of the cards
     private ImageIcon backOfCard;          //displays the image of the back of the cards
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          value = Value;
          suit = Suit;
          frontOfCard = front;
          backOfCard = back;
          setIcon(backOfCard);     //To make it non-visible when dealt
     }As you can see, each card is a JPanel. I've been told by some I shouldn't extend JPanel but rather that I should have a BufferedImage/Image instance variable for each card as the image of the card. The thing is that I need each card displayed on the GUI which can then be clickable. When it is clicked, it is moved from the players hand, into the players move. - There needs to be an animation showing this.
I've got the animation code figured out in terms of how to move 'images' around a screen to make a pleasing animation. The problem is there are no clickable listeners for images, so the Images needs to be inside some container; a widget which can fire events - Hence the reason I have chosen to extend JPanel for my Cards.
and a Deck class, snippet is as follows:
public class Deck extends JLabel //The deck will be shown on the GUI as a JLabel
     private ArrayList<Card> standardDeck;
     public Deck()
          standardDeck = new ArrayList<Card>();
          ImageIcon cardBack = new ImageIcon("CardBack.png");
          setPreferredSize(new Dimension(90, 135));
          setIcon(cardBack);
          int cardCount = 0;     //This variable counts the cards. Is used to assist in the name generation of the imageicon filename
          String str; //the imageIcon constructor accepts filenames as strings so this string holds the filename of the corresponding card image file.
          for (int a=0; a<4; a++) //putting the cards into the deck with the specifed parameters
               for (int b=2; b<15; b++)
                    cardCount+=1;     //incrementing the card count (the card files are named 1-52 as integers)
                    str = Integer.toString(cardCount); //Integer is converted to string type before being added to string str variable
                    str += ".png"; //To complete the image filename, ".png" has to be concatenated to the string.
                    standardDeck.add(new Card(b, a, new ImageIcon(str), cardBack)); //creating and then adding the cards
     }This is how I envisage a new class diagram for my game:
Card class
Game Class <--- Holds a Deck instance, Players instances, and the GUI instance
Player Class <-- Will contains hand 'instances' , but I will not create a seperate 'Hand' Class, I will use an ArrayList.
AI Class extends Player Class
GUI Class
Deck Class <-- contains 52 cards
My question is, how do I show the Cards on the GUI if my Cards are in a Deck and the Deck is held in the Game class?
Please note that there are 52 cards, so potentially 52 images on the GUI, each of which needs to be clickable. When clicked, the cards are moved about, e.g. from the deck to a players hand, from a players hand back to the deck, from a players hand to a players current move hand.
etc
I've read that GUI, program control, and logic should be seperated. If thats the case, what do I have in my GUI class if the Cards (which are JPanels) are held in the Deck class which in turn is held in the Game class?
Any help on this would be greatly appreciated!
I know what I have written may not be fully clear. I find it hard sometimes to fully convey a problem at hand. Please let me know if you don't understand what I've written and I'll do my best to explain further.

Faz_86 wrote:
Hi,
I hope a few of you Java sifus can help me understand I dilemma I keep finding myself in.
I created a card game for a university assignment which works great but its not very OO at the moment.
I only have 3 classes; a Card class, a Deck class and a Game class which contains all my GUI, AI, Game Controller, Player and Hand code.
The assignment is over but I feel like enhancing the game, adding animation, multiplayer, several AI agents etc.
Admirable, and the best way to learn, doing something that interests you.
The first thing I have attempted is animation and I've hit a brick wall. I am trying to create animation for my card game whereby I have an animation showing the cards being shuffled and then an animation which shows the cards being dealt to the players. The game then commences. The cards on the GUI then need to be clickable (MouseListeners?) to play the game. If you're running Windows 7, load up 'Hearts' and you'll know what I'm trying to achieve.
I don't understand how the GUI, and Card class need to be seperated so that its good OO.
If I give you a few snippets of code, it might explain the situation:
A snippet of my card class is as follows:
Do a quick Google on the model view controller pattern. Your listeners are your controllers. Your JPanel, JButton, etc. are your view. The AI, Player, Card and Deck (and presumably something like Score) are your model. Your model should be completely testable and not dependent on either the controller or the view. Imagine you could play the game from the command line. Get that working first. Then you can add all the bells and whistles for the UI.
import javax.swing.*;
public class Card extends JLabel //Each card is a JLabel
(redacted)
As you can see, each card is a JPanel. I've been told by some I shouldn't extend JPanel but rather that I should have a BufferedImage/Image instance variable for each card as the image of the card. The thing is that I need each card displayed on the GUI which can then be clickable. When it is clicked, it is moved from the players hand, into the players move. - There needs to be an animation showing this.Extending JPanel is fine. As you noted, you need something to add listeners to. However, I would separate things a bit. First, a card really only has a rank and suit (and perhaps an association to either the deck or a player holding the card). The notion of setIcon() is where you are tripping up. The card itself exists in memory. You should be able to test a card without using a UI. Create a separate class (CardPanel or something similar) that has a reference to a Card and the additional methods needed for your UI.
I've got the animation code figured out in terms of how to move 'images' around a screen to make a pleasing animation. The problem is there are no clickable listeners for images, so the Images needs to be inside some container; a widget which can fire events - Hence the reason I have chosen to extend JPanel for my Cards.
and a Deck class, snippet is as follows:
public class Deck extends JLabel //The deck will be shown on the GUI as a JLabel
     private ArrayList<Card> standardDeck;
     public Deck()
          standardDeck = new ArrayList<Card>();
          ImageIcon cardBack = new ImageIcon("CardBack.png");
          setPreferredSize(new Dimension(90, 135));
          setIcon(cardBack);
          int cardCount = 0;     //This variable counts the cards. Is used to assist in the name generation of the imageicon filename
          String str; //the imageIcon constructor accepts filenames as strings so this string holds the filename of the corresponding card image file.
          for (int a=0; a<4; a++) //putting the cards into the deck with the specifed parameters
               for (int b=2; b<15; b++)
                    cardCount+=1;     //incrementing the card count (the card files are named 1-52 as integers)
                    str = Integer.toString(cardCount); //Integer is converted to string type before being added to string str variable
                    str += ".png"; //To complete the image filename, ".png" has to be concatenated to the string.
                    standardDeck.add(new Card(b, a, new ImageIcon(str), cardBack)); //creating and then adding the cards
     }This is how I envisage a new class diagram for my game:
I am not an animation buff, so I will assume the above works.
Card classRemove the UI aspects to this class, and I think you are all set here.
Game Class <--- Holds a Deck instance, Players instances, and the GUI instancePresumably this is where main() resides. It will certainly have a reference to model classes (player, game, deck, etc.) and likely the master JFrame (or a controller class you create yourself).
Player Class <-- Will contains hand 'instances' , but I will not create a seperate 'Hand' Class, I will use an ArrayList.Does a player really have multiple hands? It seems to me more of a one-to-one relationship (or a player has a one-to-many relationship to Card).
AI Class extends Player ClassWhy extend Player? Create a Player interface, then have a HumanPlayer and AIPlayer implementation. Common parts could be refactored out into either a helper class (delegation) or AbstractPlayer (inheritance).
GUI ClassMy assumption is that this class has a reference to the master JFrame.
Deck Class <-- contains 52 cards
Yes. You may end up recycling this class such that a Deck can also function as a Hand for a given player. If there are differences between the two, create an interface and have a Hand and a Deck implementation. Coding to interfaces is a good thing.
My question is, how do I show the Cards on the GUI if my Cards are in a Deck and the Deck is held in the Game class?You need to pass a reference to the appropriate view class. That is how MVC works. The controller receives a request from the view, dispatches to some model functionality you write (such as GameRulesEngine, Deck, etc.) and returns a result to the view (which could be the same view or a different one, imagine someone clicking 'high scores').
Please note that there are 52 cards, so potentially 52 images on the GUI, each of which needs to be clickable. When clicked, the cards are moved about, e.g. from the deck to a players hand, from a players hand back to the deck, from a players hand to a players current move hand.
etc
That is up to you to write the animation code. In principle, you have a mouse listener, and then you take the appropriate rendering steps.
I've read that GUI, program control, and logic should be seperated. If thats the case, what do I have in my GUI class if the Cards (which are JPanels) are held in the Deck class which in turn is held in the Game class?
See above.
Any help on this would be greatly appreciated!
You are welcome.
I know what I have written may not be fully clear. I find it hard sometimes to fully convey a problem at hand. Please let me know if you don't understand what I've written and I'll do my best to explain further.No, you have been doing fine.
- Saish

How to cache images retrieved from MDM on Java WebAS

Hello Colleagues,
We have a scenario where we are trying to retrieve image records from the MDM using Java APis. Instead of hitting the DB everytime, is there a way to implement caching? For instance, is it possible to cache the images on the java WebAS and return the path of the images instead of returning the byte stream everytime?
Thanks and Regards,
Nisha
Edited by: Nisha NC on Sep 1, 2009 7:35 AM

Hi Nisha,
You can use the Class ObjectCache from the Java API.
For more information please refer to:
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Idan

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}geek images from [Using Swing Components Examples|http://java.sun.com/docs/books/tutorial/uiswing/examples/components/index.html]

Java.sql.SQLException: Error while trying to retrieve text for error ORA-24

Hi All,
Am having serious problem with ORA-24327 and the behavior is very very unpredictable. I have couple of environment where the same error comes in different context. The recent one was surprising. I have describe bellow the environment configuration and the stack trace. The error which surprised me was when I use type � 3 driver while starting weblogic I get ORA �24327 but when I use Type �4 it starts properly. If you could kindly provide solution it would be great help. I would also appreciate if u can provide information which driver to use where performance is the major concern. I would also appreciate if u could provide feed-back from the industry about booth the driver. Apart from that I have couple have environment where it occurs when 10/12 user access simultaneously. All the open connection is closed in program properly still am getting the error.
Thanks in anticipation.
Cheers,
Tapas
Environment
OS - SunOS 5.8 Generic_108528-07 sun4u sparc SUNW,Ultra-Enterprise
JDK - Solaris VM (build Solaris_JDK_1.2.2_07, native threads, sunwjit)
Weblogic - 5.1.0 Service Pack 9 04/05/2001 14:59:53 #105983
Oracle � 8.1.6
Delaying 10 seconds before making a beuatpool pool connection.
Pool 1 (Type �3 )
weblogic.jdbc.connectionPool.beuatpool=\
url=jdbc:weblogic:oracle,\
driver=weblogic.jdbc.oci.Driver,\
loginDelaySecs=10,\
initialCapacity=10,\
maxCapacity=20,\
capacityIncrement=2,\
allowShrinking=true,\
shrinkPeriodMins=10,\
refreshMinutes=10,\
testTable=dual,\
props=user=xxx;password=xxx;server=xxxx
Pool 2(Type �4)
weblogic.jdbc.connectionPool.thinPool=\
url=jdbc:oracle:thin:@xxx:1521:xxx,\
driver=oracle.jdbc.driver.OracleDriver,\
loginDelaySecs=1,\
initialCapacity=1,\
maxCapacity=10,\
capacityIncrement=1,\
allowShrinking=true,\
shrinkPeriodMins=15,\
refreshMinutes=15,\
testTable=dual,\
props=user=xxx;password=xxx;server=xxx:1521:xxx
allow=everyone
---------- LOGIN ERROR CODE: 24327
java.sql.SQLException: Error while trying to retrieve text for error ORA-24327 �
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
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at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(Con
nectionEnvFactory.java:149)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(Con
nectionEnvFactory.java:109)
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e)
at weblogic.common.internal.ResourceAllocator.<init>(Compiled Code)
at weblogic.jdbc.common.internal.ConnectionPool.startup(ConnectionPool.j
ava:330)
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at weblogic.jdbc.common.internal.JdbcInfo.startup(JdbcInfo.java:200)
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at java.lang.reflect.Method.invoke(Native Method)
at weblogic.t3.srvr.StartupThread.runMain(StartupThread.java:219)
at weblogic.t3.srvr.StartupThread.doWork(Compiled Code)
at weblogic.t3.srvr.PropertyExecuteThread.run(PropertyExecuteThread.java
:62)
---------- LOGIN ERROR CODE: 24327
---------- LOGIN ERROR CODE: 24327
Fri Aug 31 00:57:22 GMT-05:00 2001:<I> <JDBC Pool> Sleeping in createResource()
Fri Aug 31 00:57:23 GMT-05:00 2001:<E> <JDBC Pool> Failed to create connection p
ool "beuatpool"
weblogic.common.ResourceException: weblogic.common.ResourceException:
Could not create pool connection. The DBMS driver exception was:
java.sql.SQLException: Error while trying to retrieve text for error ORA-24327 -
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.sql.SQLException.<init>(SQLException.java:43)
at weblogic.db.oci.OciConnection.getLDAException(OciConnection.java:143)
at weblogic.jdbcbase.oci.Driver.connect(Driver.java:157)
at java.sql.DriverManager.getConnection(Compiled Code)
at java.sql.DriverManager.getConnection(DriverManager.java:137)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(Con
nectionEnvFactory.java:172)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(Con
nectionEnvFactory.java:109)
at weblogic.common.internal.ResourceAllocator.makeResources(Compiled Cod
e)
at weblogic.common.internal.ResourceAllocator.<init>(Compiled Code)
at weblogic.jdbc.common.internal.ConnectionPool.startup(ConnectionPool.j
ava:330)
at weblogic.jdbc.common.internal.JdbcInfo.initPools(Compiled Code)
at weblogic.jdbc.common.internal.JdbcInfo.startup(JdbcInfo.java:200)
at weblogic.jdbc.common.internal.JdbcStartup.main(JdbcStartup.java:11)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.t3.srvr.StartupThread.runMain(StartupThread.java:219)
at weblogic.t3.srvr.StartupThread.doWork(Compiled Code)
at weblogic.t3.srvr.PropertyExecuteThread.run(PropertyExecuteThread.java
:62)
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at weblogic.common.ResourceException.<init>(ResourceException.java:18)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(Con
nectionEnvFactory.java:182)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(Con
nectionEnvFactory.java:109)
at weblogic.common.internal.ResourceAllocator.makeResources(Compiled Cod
e)
at weblogic.common.internal.ResourceAllocator.<init>(Compiled Code)
at weblogic.jdbc.common.internal.ConnectionPool.startup(ConnectionPool.j
ava:330)
at weblogic.jdbc.common.internal.JdbcInfo.initPools(Compiled Code)
at weblogic.jdbc.common.internal.JdbcInfo.startup(JdbcInfo.java:200)
at weblogic.jdbc.common.internal.JdbcStartup.main(JdbcStartup.java:11)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.t3.srvr.StartupThread.runMain(StartupThread.java:219)
at weblogic.t3.srvr.StartupThread.doWork(Compiled Code)
at weblogic.t3.srvr.PropertyExecuteThread.run(PropertyExecuteThread.java
:62)
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at weblogic.common.ResourceException.<init>(ResourceException.java:18)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(Con
nectionEnvFactory.java:125)
at weblogic.common.internal.ResourceAllocator.makeResources(Compiled Cod
e)
at weblogic.common.internal.ResourceAllocator.<init>(Compiled Code)
at weblogic.jdbc.common.internal.ConnectionPool.startup(ConnectionPool.j
ava:330)
at weblogic.jdbc.common.internal.JdbcInfo.initPools(Compiled Code)
at weblogic.jdbc.common.internal.JdbcInfo.startup(JdbcInfo.java:200)
at weblogic.jdbc.common.internal.JdbcStartup.main(JdbcStartup.java:11)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.t3.srvr.StartupThread.runMain(StartupThread.java:219)
at weblogic.t3.srvr.StartupThread.doWork(Compiled Code)
at weblogic.t3.srvr.PropertyExecuteThread.run(PropertyExecuteThread.java
:62)

Hi,
I guess you can try some of these:
- Make sure you're not missing an entry inside your tnsnames.ora file. Thin driver does not require the information inside that file, as opposed to Weblogic's OCI driver. If you are able to connect to the DB using a thin driver, then the problem is most probably (WL)driver-related.
- Make sure you've properly configured the DB user / password inside your weblogic.properties (config.xml if WL6+).
- Make sure you're able to access all drivers and classes required (PATH, CLASSPATH, etc...)
- Make sure the OCI driver version you are using is fully compatible with the Oracle (server) version you are pointing to.
- Try to access the DB user through some other client (for instance, SQLPlus*).
Hope this is of some help,
Freddy.

Java.sql.SQLException: Error while trying to retrieve text for error ORA-12545

Hi,
I am getting the following error when i tried to connect to Oracle database from
a servlet. This exception is coming at the time of getting connection. And the
same code is working when i used in the standalone java program.
Oracle 8i database and WLS 6.0 are on the same UNIX machine.
---------attempting to connect ------
java.sql.SQLException: Error while trying to retrieve text for error ORA-12545
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java, Compiled
Code)
at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java, Compiled C
ode)
at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java, Compiled Code)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java, Com
piled Code)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va, Compiled Code)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java, Compiled C
ode)
at java.sql.DriverManager.getConnection(DriverManager.java, Compiled Cod
e)
at java.sql.DriverManager.getConnection(DriverManager.java, Compiled Cod
e)
at ConnectionPoolServlet.doGet(ConnectionPoolServlet.java, Compiled Code
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Cod
e)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Cod
e)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java, Compiled Code)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java, Compiled Code)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java, Compiled Code)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java, Compiled Co
de)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled Code)
Can any one help me out.
Durga

The problem is solved after exprting the parameter ORACLE_SID=<database_name>
in Weblogic startup script.
thank u for the suggestions.
Durga
Joseph Weinstein <[email protected]> wrote:
>
>
Durga wrote:
Hi Joe,
I have checked the ORACLE_HOME parameter. There was a differnce. Ichanged to
/oracle/app/product/8.1.7
Now i am getting different exception. But still the standalone codeis working.
any clues why I am getting this exception. I will send the code andthe weblogic
properties file for reference if u need.Good. No, I don't need it. Now make sure the library path that the OS
uses to find
Oracle libraries, and our driver libraries etc., is in the same order
for the
server as for the shell that is successful on it's own. Make sure your
Oracle
client stuff is ahead of any weblogic libraries.
Joe
java.sql.SQLException: ORA-12547: TNS:lost contact
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java,Compiled
Code)
at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java,Compiled
C
ode)
at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java, CompiledCode)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java,Com
piled Code)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java,Compiled
C
ode)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java,Compiled
C
ode)
at java.sql.DriverManager.getConnection(DriverManager.java,Compiled Cod
e)
at java.sql.DriverManager.getConnection(DriverManager.java:177)
at ConnectionPoolServlet.doGet(ConnectionPoolServlet.java,Compiled Code
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl.getRuntimeName(ServletStubI
mpl.java, Compiled Code)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java, Compiled Code)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:1631)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java,Compiled
Co
de)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, CompiledCode)
Joseph Weinstein <[email protected]> wrote:
The environment for the server probably doesn't have the same ORACLE_HOME
setting as your shell when you succeed in a standalone.
Also, you should be using our connection pools, and you should avoid
making DriverManager calls in any multithreaded app such as WebLogic.
Joe
Durga wrote:
Hi,
I am getting the following error when i tried to connect to Oracledatabase from
a servlet. This exception is coming at the time of getting connection.And the
same code is working when i used in the standalone java program.
Oracle 8i database and WLS 6.0 are on the same UNIX machine.
---------attempting to connect ------
java.sql.SQLException: Error while trying to retrieve text for errorORA-12545
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java,
Compiled
Code)
at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java, CompiledC
ode)
at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java, Compiled
Code)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java,Com
piled Code)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va, Compiled Code)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java, CompiledC
ode)
at java.sql.DriverManager.getConnection(DriverManager.java, CompiledCod
e)
at java.sql.DriverManager.getConnection(DriverManager.java, CompiledCod
e)
at ConnectionPoolServlet.doGet(ConnectionPoolServlet.java, CompiledCode
at javax.servlet.http.HttpServlet.service(HttpServlet.java, CompiledCod
e)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, CompiledCod
e)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java, Compiled Code)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java, Compiled Code)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java, Compiled Code)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java, CompiledCo
de)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
Code)
Can any one help me out.
Durga

Java.sql.SQLException: Error while trying to retrieve text for error ORA-12

Hi,
I am getting the following error when i tried to connect to Oracle database from a servlet on HP-UX. I am using wls 6.0. And the same code is working when i used in the standalone java program.
java.sql.SQLException: Error while trying to retrieve text for error ORA-12545
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java, Compiled
Code)
at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java, Compiled C
ode)
at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java, Compiled Code)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java, Com
piled Code)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va, Compiled Code)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java, Compiled C
ode)
at java.sql.DriverManager.getConnection(DriverManager.java, Compiled Cod
e)
at java.sql.DriverManager.getConnection(DriverManager.java, Compiled Cod
e)
at ConnectionPoolServlet.doGet(ConnectionPoolServlet.java, Compiled Code
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Cod
e)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Cod
e)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java, Compiled Code)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java, Compiled Code)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java, Compiled Code)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java, Compiled Co
de)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled Code)
Can any one help me out.
Durga

This is the text for ORA-12545, there is a problem in your NET8 somewhere.
http://technet.oracle.com/doc/network.815/a67440/ch11.htm#440586

Using Java for scripting in games - which technology to use?

Hi, I'm currently in the process of implementing a java scripting implementation for a 3D game engine. Any suggestions on which java technology to use? It will handle high level game specific logic and a gui. So there will be a native implementation of awt created as well. I'm starting off with win32 and will port to mac and linux later.
I'm thinking J2ME-CDC, but then theres CDLC, the personal edition, and so on. CDC and CDLC are nice since the jvm code is included but the CDC one needs to be ported to win32 (anyone already do this?)

J2ME is designed for small consumer devices such as mobile phones, pda, pagers, set-top boxes and so on.
You'r designing something for windows, mac and linux so I'd suggest standard edition rather than micro edition.
I'm confused as to what you want to do though.
Also, "porting" a java program shouldn't really be an issue (unless you've used lots of JNI or Runtime stuff).
Basically though I don't really understand what you want to do, I did have some idea, but then you started talking about Micro Edition.

[Newbie] Which JAVA API is a good choice for creating a game board?

I'm a newbie in JAVA game programming.
I would like to create a chess game for fun. I have a fairly good idea on how I want it to be, but I'm having some difficulty on the game board.
I am not sure which set of JAVA API I should be using to design my board. I guess that the board will sits in the back, and in the front, there'll be my chess pieces that I can drag and drop.
Should I be using JAVA Swing to do this? or JAVA 2D API? It will require some study for either one, so I figure I should pick a good one to learn.
Thanks in advance! :-)

Also if you would like to create a much simpler, 2D chess game, I would suggest you use the Swing API, which comes with Java from version 1.2 and on up. Naturally I would suggest at least using the latest 1.4 or 1.5 software development kit, because they have greater and more stable features, bug fixes and so on. I also would suggest you go to the library or Barnes and Noble nearest you, and pick up a book on Java. One recommendation that may be simpler to get an understanding of Java is from Deitel and Deitel: http://www.deitel.com/books/jHTP6/ though my beginner's Java book was geared directly toward how to program games (small games like memory, or tetris), though I can't remember what it was called. Anyway I believe it is very important to learn the basics of Java before you get into things that you may or may not understand. My opinion, so have a go at it.

What is the best method for storing/retrieving images?

Friends,
OS: RHEL AS 3
DB: 9iR2
We have some critical situation. We need to scan all our Purchase orders and to store in our pc. we don't want to store the images in the database. it will be a big headache. We have 4 branches in different cities. All the branches are connected to our local network. We have novell server in every branches to store the oracle forms and the db is centralized in our head office. The purpose is to view any PO in any branch.
so,what will be the best solution for storing the images for our archiving?
thanks & regards

Yes - a good quality external hard drive is the answer
Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats) and that it is always available prior to launching iPhoto
And backup soon and often - having your iPhoto library on an external drive is not a backup and if you are using Time Machine you need to check and be sure that TM is backing up your external drive
LN

The ever so savvy "creating a java game" post

Hey, I'm creating a java game, and I did research, and found that this question has been asked many, many times. But my question unfortunately did not match up with any of these posts :( So here goes...
Im creating a java game, which will run as....kind of a mix between a 2d game, and 3d game (no i am not insane). I dont want the original zelda look, and i dont want the first person shooter look, I want my character to be viewed from an angle, like tibia - if anyone has ever played that. And I also want to leave open the door to changing the view within the game. I figured I can just get my graphics friends to draw things in 3-d, (draw a house [draw the 4 sides and the roof]), and then somehow skew these images to accomodate for a different view.
I am more than willing to code some kind of graphics engine if what I need is not available, I have looked at a couple and found no such luck.
So what is the most efficient way to create this game? By just sortof getting all the graphics to be from a certain percpective, and then somehow modifying them with java.....
or by using some kind of graphics engine that allows me to change views? If so any recomendations?
Thanks a lot - wow this was long, oh yea a couple Dukes for this too thanks again
-Mark

you don't need to do any skewing. Here's what I'd do. I'd store all the tile information in a matrix (Object[][]) with a custom tile class that has the information it needs to retrieve its appropriate image, and certain game related data like slow down factor when a person walks over a certain type of tile, and whether it can be collided with. I'd draw them based on however you decide to angle your tiles. But the important part is you go in this order:
[0, 0], [0, 1], [1, 0], [0, 2], [1, 1], [2, 0], etc., etc....
The idea is if you're turning the floor 45 degrees clockwise, to give the correct illusion of depth, you'll want to draw the furthest back tile first, and the furthest tile forward last. Whether you start on the left or right depends on what angle you decide to work with. At a 45 degree angle, it obviously doesn't matter whether you start on the left or right. But if you guess wrong with your rendering, it will show because tiles that are closer to the "camera" will be overlapped by tiles further from the "camera".
for (int i = 0; i < tiles.length; i++) {
for (int j = 0; j < tiles.length; j++) {
graphics2D.drawImage(tiles[i].getImage(), i*horizontalSpacing - camera.getX(), j*verticalSpacing, camera.getY(), null);
}horizontalSpacing and verticalSpacing will be determined by the angle of your tiles. Set those to match however you make your art.
Drawing moving sprites will be a bit trickier because you'll have to decide which set of axes to follow... meaning, do you follow the axes of the screen, or the axes of your "rotated world." Give that some thought and once you understand what's happening with the perspective here you'll be able to see which is easiest.
So there's your engine ;)
Now, as for the art itself, make them in png format, so that you can have the base of your images be diamond shape, but of course tiles for players and walls and stuff will extend above that diamond. Just don't let them get below the base of their diamond otherwise the tile that gets drawn below them will cut them off. And you don't want a character's feet cut off by the "floor" as he runs ;)
For your final question, don't let java skew the sprite. The only possible way to make it decent is if when you pick an angle, a 3D render takes your 3D world and it's 3D models and re-renders them at that angle; skewing is simply not capable of creating that illusion. The closest you could get is to simply squish the hight of your art to give the illusion that the camera is moving up, but since you can't expose things higher, like the top of your character's head (since the data doesn't exist in the "lower" version), it will be obviously funny looking.
Hope that answers your questions, and good luck! I would definitely like to see what you come up with.

Help Needed For Creating A Game

Hi, I recently decided to make a MMORPG.A game people will enjoy and have fun, I would of course keep it free sense I have play many games that cost 5-15 dollars a month.I have many creative ideas, but I need someone to show me the ropes and teach me how to use Java and i currently looking for a site to download it at.If anyone would care to teach me how to use this or would like to help me create this game(Medievil type game, Swords armor gold houses dragonslaying and plenty more) post here or send me a pm and we can talk more private.
I need:
*A site to download the best possiable Java console
*Helpful tutorial sites
*Or any other sites or tips you think i should know.
Extra Info On Me:
I dont know if this matters or not probably doesnt but I know how to handle and make a site, ive had some dbz rpgs back in the day(kinda rusty but i can manage).
Some more recent information:
I tried game maker and that doesnt seem to helpful.It would only be helpful if I played them 20 bucks which I am not going to do.
Also i am downloading now JS2E 5.0 for Java.
I am stilling waiting on some type of input or even a mentor.

Hi there!
I'm not really a game programmer.. but here's some links anyway.
Someone pointed out this tutorial to me, and I think it is worthwhile:
http://fivedots.coe.psu.ac.th/~ad/jg/
It has stuff on Java 3D, networking, games for mobile phones/PDAs, isometric tile games, etc. It also has an appendix on loaders and Java Web Start.
Also, if you want to create 3D games, you might want to check out
http://www.3dcafe.com/asp/freestuff.asp
They have free 3D models in various formats.
For more 3D links and tutorials try:
http://www.3dlinks.com/
For a 3D tool, I like Anim8or. That it's free helps a lot ;)
http://www.anim8or.com/
And... ms paint!?! You will not be able to draw decent graphics with that. Adobe Photoshop Elements is a nice, low-cost program for 2D images.
There are lots of sites devoted to java game programming. Try the google. Love the google. Google is your friend. ;)
:) jen

Retrieving images for a java game

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