Details
-
Bug
-
Resolution: Cannot Reproduce
-
P3
-
None
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1.3.0
-
x86
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windows_2000
Description
Name: yyT116575 Date: 11/30/2000
System.getProperty("java.version") returns "1.3.0rc1"
System.getProperty("java.class.version") returns "47.0"
When using the default JVM for Netscape 6 PR1, an applet which attempts
to create a java.awt.Image for a byte array containing a JPEG image receives
this exception:
sun.awt.image.ImageFormatException: JPEG datastream contains no image
at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
at sun.awt.image.JPEGImageDecoder.produceImage(Unknown Source)
at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
at sun.awt.image.ImageFetcher.run(Unknown Source)
Note: This sounds similar to bug 4025679 reported against JDK 1.0, and fixed in
JDK 1.1fcs.
A small example follows:
JPEGApplet.java:
import java.applet.*;
import java.awt.*;
public class JPEGApplet extends Applet
{
public void init()
{
System.out.println("JPEGApplet started");
try { Thread.currentThread().sleep(5000); }
catch (InterruptedException ie) {}
new Splash(getParentFrame(), "image.jpg", 270, 164);
}
private Frame getParentFrame()
{
Component c = getParent();
while (c != null && !(c instanceof Frame))
c = c.getParent();
return (Frame)c;
}
}
Splash.java:
import java.awt.*;
class Splash extends Window
{
Splash(Frame parent, String imageResourceName, int width, int height)
{
super(parent);
setBackground(Color.white);
Dimension screen = getToolkit().getScreenSize();
int myWidth = width + 50;
int myHeight = height + 50;
setBounds((screen.width - myWidth) / 2, (screen.height - myHeight) / 2, myWidth, myHeight);
add(new ImageCanvas(imageResourceName, width, height), "Center");
setVisible(true);
}
}
ImageCanvas.java:
import java.awt.*;
import java.awt.image.*;
import java.net.URL;
import java.io.*;
import java.util.*;
class ImageCanvas extends Canvas
{
ImageCanvas(String imageResourceName, int width, int height)
{
try
{
InputStream is = getClass().getResourceAsStream(imageResourceName);
if (is == null)
{
System.out.println("Unable to get " + imageResourceName);
return;
}
byte[] buf = new byte[is.available()];
is.read(buf);
is.close();
image = getToolkit().createImage(buf);
}
catch (IOException ioe)
{
System.out.println("Unable to get " + imageResourceName + ": " + ioe);
return;
}
if (image != null)
prepareImage(image, width, height, this);
this.width = width;
this.height = height;
}
public void paint(Graphics g)
{
if (image != null)
{
Dimension size = getSize();
g.drawImage(image, (size.width - width) / 2, (size.height - height) / 2, this);
}
}
public void update(Graphics g)
{
paint(g);
}
public Dimension getMinimumSize()
{
if (image == null)
return new Dimension(0,0);
int width = image.getWidth(this);
int height = image.getHeight(this);
if (width <= 0 || height <= 0)
{
width = this.width;
height = this.height;
}
return new Dimension(width, height);
}
public Dimension getPreferredSize()
{
return getMinimumSize();
}
private Image image;
private int width;
private int height;
}
image.jpg: can be accessed from
http://customer.platypuspartners.com/JPEGApplet/image.jpg
JPEGApplet.html:
<HTML>
<BODY>
<applet code="JPEGApplet.class" archive="JPEGApplet.jar" width=200 height=200>
</applet>
</BODY>
How to recreate:
javac JPEGApplet.java
jar cf JPEGApplet.jar *.class image.jpg
Start Netscape 6
Select Tasks -> Tools -> Java Console
In the URL field, enter the URL of the JPEGApplet.html file
(Review ID: 104971)
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