Please tell me what is wrong with my code.

Question

Hi there,
I have developed a simple class alpPhoto.java in which I can find out the width height of a image using ImageIcon. Everything works fine when I deploy myApp.ear file on my OC4J - NT version. But when I deploy myApp.ear file on my OC4J - Unix version, the jsp that I call alpPhoto got hung until timed out. Here is the code of alpPhoto:
import java.io.*;
import java.util.* ;
import javax.swing.*;
import java.net.*;
public class alpPhoto {
private int ImgWidth ;
public void setImgWidth(int width )
this.ImgWidth = width ;
public int getImgWidth()
return this.ImgWidth ;
private int ImgHeight ;
public void setImgHeight(int height)
this.ImgHeight = height ;
public int getImgHeight()
return this.ImgHeight;
private String ImgURL ;
public void setImgURL(String strURL){
this.ImgURL = strURL ;
public String getImgURL()
return this.ImgURL ;
public alpPhoto(String imgPath) throws Exception
if( imgPath == null || imgPath == ""){
throw new Exception("The physical path to the photo is empty.") ;
}else{
System.out.println( imgPath);
File myFile = new File(imgPath) ;
if(myFile.exists()){
URL myURL = myFile.toURL() ;
setImgURL( myURL.toString() );
ImageIcon image = new ImageIcon(myURL);
setImgWidth( image.getIconWidth() );
setImgHeight( image.getIconHeight()) ;
}else{
throw new Exception(imgPath + " does not exist.\n\n") ;
Here is how I call this class in my jsp file:
<%
alpPhoto curPhoto = new alpPhoto(imgPath) ;
int width = curPhoto.getImgWidth();
int height = curPhoto.getImgHeight();
%>
where the "imgPath" is the parameter passed from other jsp file.
I wonder if there is bug or obviously what is the main difference between the OC4J - NT version and the OC4J - Unix version.
Thanks in advance.
Henry

Answer 1

Not sure if this will help, but take a look at the MediaTracker class. The MediaTracker will wait until an image is completely loaded before continuing. This will ensure that you width/height values are always non-zero.