How can I draw image in a vbean?

Question

How can I draw image in a vbean?
this is my code :
import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.Graphics;
import java.net.MalformedURLException;
import java.net.URL;
import com.sun.jimi.core.Jimi;
import oracle.forms.handler.IHandler;
import oracle.forms.properties.ID;
import oracle.forms.ui.VBean;
public class PrintEmailLogo extends VBean {
     URL url;
     Image img;
     boolean ImageLoaded = false;
     public void paint(Graphics g) {
          if (ImageLoaded) {
               System.out.println("yes~~~");
               g.drawImage(img, 0, 0, null);
          } else
               System.out.println("no~~~");
     public boolean imageUpdate(Image img, int infoflags, int x, int y, int w,
               int h) {
          if (infoflags == ALLBITS) {
               System.out.println("yes");
               ImageLoaded = true;
               repaint();
               return false;
          } else
               return true;
     public void init(IHandler arg0) {
          super.init(arg0);
          try {
               url = new URL("file:print/77G.gif");
               img = Jimi.getImage(url);
               Image offScreenImage = createImage(size().width, size().height);
               Graphics offScreenGC = offScreenImage.getGraphics();
               System.out.println(offScreenGC.drawImage(img, 0, 0, this));
          } catch (MalformedURLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
but when I run it in forms
when it run Graphics offScreenGC = offScreenImage.getGraphics();
It throw a exception:
java.lang.NullPointerException     at com.avicit.aepcs.calendar.PrintEmailLogo.init(PrintEmailLogo.java:72)     at oracle.forms.handler.UICommon.instantiate(Unknown Source)     at oracle.forms.handler.UICommon.onCreate(Unknown Source)     at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)     at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)     at oracle.forms.engine.Runform.processMessage(Unknown Source)     at oracle.forms.engine.Runform.processSet(Unknown Source)     at oracle.forms.engine.Runform.onMessageReal(Unknown Source)     at oracle.forms.engine.Runform.onMessage(Unknown Source)     at oracle.forms.engine.Runform.processEventEnd(Unknown Source)     at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)     at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)     at java.awt.Component.dispatchEventImpl(Unknown Source)     at java.awt.Container.dispatchEventImpl(Unknown Source)     at java.awt.Component.dispatchEvent(Unknown Source)     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)     at java.awt.Container.dispatchEventImpl(Unknown Source)     at java.awt.Component.dispatchEvent(Unknown Source)     at java.awt.EventQueue.dispatchEvent(Unknown Source)     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)     at java.awt.EventDispatchThread.run(Unknown Source)
I change it to:
import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.Graphics;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFrame;
import com.sun.jimi.core.Jimi;
import oracle.forms.handler.IHandler;
import oracle.forms.properties.ID;
import oracle.forms.ui.VBean;
public class PrintEmailLogo extends VBean {
     URL url;
     Image img;
     public void paint(Graphics g) {
          try {
               url = new URL("file:print/77G.gif");
               img = Jimi.getImage(url);
               g.drawImage(img, 0, 0, this));
          } catch (MalformedURLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
     public void init(IHandler arg0) {
          super.init(arg0);
But it display nothing.
It isn't paint continuous.
what's wrong in my vbean?
please help me.

Answer 1

The following code works fine for me:
package oracle.forms.fd;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import oracle.forms.handler.IHandler;
import oracle.forms.properties.ID;
import oracle.forms.ui.CustomEvent;
import oracle.forms.ui.VBean;
public class test extends VBean {
  private URL url;
  private URL m_codeBase; 
  private Image img;
public void paint(Graphics g) {
  // draw the image
  g.drawImage(img, 0, 0, this);
public void init(IHandler arg0) {
   super.init(arg0);
   // load image file
   img = loadImage("file:///c:/coyote.jpg");   
public test()
    super();
   *  Load an image from JAR file, Client machine or Internet URL  *
  private Image loadImage(String imageName)
    URL imageURL = null;
    boolean loadSuccess = false;
    Image img = null ;
    //JAR
    imageURL = getClass().getResource(imageName);
    if (imageURL != null)
      try
        img = Toolkit.getDefaultToolkit().getImage(imageURL);
        loadSuccess = true;
        return img ;
      catch (Exception ilex)
        System.out.println("Error loading image from JAR: " + ilex.toString());
    else
      System.out.println("Unable to find " + imageName + " in JAR");
    //DOCBASE
    if (loadSuccess == false)
      System.out.println("Searching docbase for " + imageName);
      try
        if (imageName.toLowerCase().startsWith("http://")||imageName.toLowerCase().startsWith("https://"))
          imageURL = new URL(imageName);
        else if(imageName.toLowerCase().startsWith("file:"))
          imageURL = new URL(imageName);
        else
          imageURL = new URL(m_codeBase.getProtocol() + "://" + m_codeBase.getHost() + ":" + m_codeBase.getPort() + imageName);
        System.out.println("Constructed URL: " + imageURL.toString());
        try
          img = createImage((java.awt.image.ImageProducer) imageURL.getContent());
          loadSuccess = true;
          System.out.println("Image found: " + imageURL.toString());
          return img ;
        catch (Exception ilex)
          System.out.println("Error reading image - " + ilex.toString());
      catch (java.net.MalformedURLException urlex)
        System.out.println("Error creating URL - " + urlex.toString());
    //CODEBASE
    if (loadSuccess == false)
      System.out.println("Searching codebase for " + imageName);
      try
        imageURL = new URL(m_codeBase, imageName);
        System.out.println("Constructed URL: " + imageURL.toString());
        try
          img = createImage((java.awt.image.ImageProducer) imageURL.getContent());
          loadSuccess = true;
          System.out.println("Image found: " + imageURL.toString());
          return img ;
        catch (Exception ilex)
                System.out.println("Error reading image - " + ilex.toString());
      catch (java.net.MalformedURLException urlex)
        System.out.println("Error creating URL - " + urlex.toString());
    if (loadSuccess == false)
      System.out.println("Error image " + imageName + " could not be located");
    return img ;
}Francois