D'oh! Now *THAT* rings a bell :)
Mark Hagger wrote:
You need to have:
-Djava.awt.headless=true
in your java start up args, this will prevent it from trying to talk to an X
server. Obviously some image related stuff has to talk to an X server, but
just ImageIO stuff is fine.
Mark
On Thursday 12 January 2006 19:31, Frank W. Zammetti wrote:
I don't quite see how this is Tomcat-related, but...
Your code can't connect to your X server, which is necessary for many
Java graphics-related functions to work on a *nix system. I dealt with
this at one point when getting DataVision working on Linux, and I recall
the solution being something to do with an environment variable, but the
exact answer eludes me.
Actually, it looks like you *have* defined the environment variable
(DISPLAY in the stack trace rings a bell). Is X running? I believe it
has to be for this to work.
Frank
Justin Jaynes wrote:
Hello all,
I've written a java class to scale jpeg images. But I can't seem to get
it to work. Can anyone point me in the right direction?
Here is my code:
package com.everybuddystree;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class ImageScaler {
public ImageScaler() {
}
public boolean scaleImageByWidth(String fileName, int newWidth) {
File originalImage = new File(fileName);
try {
BufferedImage workingBufferedImage = ImageIO.read(originalImage);
int width = workingBufferedImage.getWidth();
int height = workingBufferedImage.getHeight();
Image workingImage = workingBufferedImage;
workingImage = (Image)workingImage.getScaledInstance(newWidth,-1,1);
BufferedImage finalImage = (BufferedImage)workingImage;
ImageIO.write(finalImage, "jpg", originalImage);
return true;
} catch (IOException ex){
return false;
}
}
}
When I run the pass an image to the class using a jsp I get the
following errors from Tomcat:
HTTP Status 500 -
---------------------------------
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request. exception
javax.servlet.ServletException: Can't connect to X11 window server using
':0.0' as the value of the DISPLAY variable.
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageConte
xtImpl.java:848)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContext
Impl.java:781)
org.apache.jsp.image_jsp._jspService(org.apache.jsp.image_jsp:158)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.jav
a:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802) root cause
java.lang.InternalError: Can't connect to X11 window server using ':0.0'
as the value of the DISPLAY variable.
sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
sun.awt.X11GraphicsEnvironment.access$000(X11GraphicsEnvironment.java:53)
sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:142)
java.security.AccessController.doPrivileged(Native Method)
sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:164)
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironm
ent.java:68) sun.awt.X11.XToolkit.<clinit>(XToolkit.java:96)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:164)
java.awt.Toolkit$2.run(Toolkit.java:821)
java.security.AccessController.doPrivileged(Native Method)
java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)
java.awt.Image.getScaledInstance(Image.java:158)
com.everybuddystree.ImageScaler.scaleImageByWidth(ImageScaler.java:21)
org.apache.jsp.image_jsp._jspService(org.apache.jsp.image_jsp:114)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.jav
a:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802) note The
full stack trace of the root cause is available in the Apache
Tomcat/5.5.12 logs.
---------------------------------
Apache Tomcat/5.5.12
---------------------------------
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