BIG Problem with java 1.4 headless mode!!!!

Question

Hello,
I try to build in a get method of a servlet an image to send to the client http.
On my server obviously I havent a display thus I looked for some packages that cuold solve the problem of "CANT COONECT TO X11 ecc.".
I found three solution:
1 A virtual frame buffer but It isnt a good solution for me because if 500 users try to connect to my servlet at the same time only one frame buffer could be a problem and It isn't an elegant solution.
2 A Use pja on my server it dont work I dont know why.
I have set the System.setProperty("awt.toolkit","com.eteks...PjaToolkit) but it dont work when I try to instaziate a Panel (of Pja types) It give me an exception.
3 The choose I prefer but It still dont work. Use Java 1.4 beta 3. I try to use this version because it has headles support but it dont work and I see in the bugs database that I'm not the only one that keep this problem in Servlet environment. In the doGet method of my Servlet I use the System.SetProperty("java.awt.headless","true") command to turn on headless support but when I try to instanziate a Panel or a Frame I get the exception HeadlessException.
Have someone use this property of the jdk 1.4 and could give me some hints.
I try to change my Xbootclasspath in the zone.properties of my Apache Server through wrapper.bi9n.parameter but I didnt have better result.
Cuold someone help or I'll cry for all the xmas holiday :-)
Thank you very much Ponzetti76

Answer 1

what a pity! I still haven't found a solution for the problem rajsaini mentioned one year ago! I also wrote a class for resizing an image after uploading a file. When I call the mehtod the first time from a jsp a get the error "can't connect to X server .." and when a try it second time I receive NoClassDefFoundError.
Here is the code of the class I try to call from a jsp
import java.io.*;
import java.awt.image.*;
import java.awt.*;
import javax.imageio.ImageIO;
public class imgUp {
public imgUp() {
public void generateThumbnail(String fileName, int maxSize) {
System.setProperty ("java.awt.headless", "true");
System.out.println("Headless is " +
System.getProperty"java.awt.headless"));
try {
String orgFileName = fileName;
File orgImgFile = new File(orgFileName);
String newFileName = orgImgFile.getParent() + "/th_" +
orgImgFile.getName();
// read image
BufferedImage orgImage = ImageIO.read(orgImgFile);
BufferedImage resizedImage = null;
// resizing ;))
int orgImageWidth = orgImage.getWidth(null);
int orgImageHeight = orgImage.getHeight(null);
int resizeImageWidth = 0;
int resizeImageHeight = 0;
if (orgImageWidth > orgImageHeight) {
resizeImageWidth = maxSize;
resizeImageHeight = (maxSize * orgImageHeight) / orgImageWidth;
} else {
resizeImageWidth = (maxSize * orgImageWidth) / orgImageHeight;
resizeImageHeight = maxSize;
resizedImage = new BufferedImage(resizeImageWidth,resizeImageHeight, Image.SCALE_SMOOTH);
// Copy image to buffered image.
Graphics g = resizedImage.createGraphics();
g.drawImage(orgImage, 0, 0,resizeImageWidth, resizeImageHeight,null);
/* write the jpeg to a file */
File file = new File(newFileName);
ImageIO.write(resizedImage, "jpg", file);
catch (Exception e){
System.out.println("exception");
The strange thing this Exception is never triggerd
and heres the code of the calling jsp :
if(request.getParameter("upnow") != null && request.getParameter("upnow").equals("now")){
imgUp.generateThumbnail("/www/demo/imageupload/i.jpg", 100);
I set a System.out.println ... after each command of the class and I found out it crashes while this : Graphics g = resizedImage.createGraphics();
The last thing I want to add is, that the commandline version of class works perfectly.
Systemenv:tomcat 4.1.18, jdk 1.4
Thanks for any ideas in advance