?
Solved

java.awt.HeadlessException

Posted on 2003-11-13
5
Medium Priority
?
583 Views
Last Modified: 2013-11-24
i have a servlet which was used to generate images on the fly.  Locally, the servlet worked fine.  However, once deployed on the app server, it crashes resulting in the stack trace below.  It seems the classes I'm using (ImageJ) to create the images, builds the image using a heavy-weight component (jframe) and an exception is thrown because that component requires a mouse, keyboard, monitor, etc... and apparently this server doesn't have any of that.

Does anyone knwo how I can 'get around' this exception?  I've read that setting the -Djava.awt.Headless=true option has worked for some, but many have said it did nothing for them.  I'm assuming that I can set this property via System.setProperty("java.awt.Headless", true) and it should have the same effect as command-line parameter, correct?

Please, anything you can offer I would appreciate.
0
Comment
Question by:sapientconceptions
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 

Author Comment

by:sapientconceptions
ID: 9745517
Sorry, forgot the stack (or the relevant part anyway):

java.awt.HeadlessException
      at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:121)
      at java.awt.Window.(Window.java:251)
      at java.awt.Frame.(Frame.java:398)
      at java.awt.Frame.(Frame.java:363)
      at ij.process.ImageProcessor.setupFrame(ImageProcessor.java:688)
      at ij.process.ImageProcessor.getFontMetrics(ImageProcessor.java:797)
0
 
LVL 92

Expert Comment

by:objects
ID: 9745519
Depends what version of Java u are running on the server.
0
 
LVL 92

Expert Comment

by:objects
ID: 9745524
This may be an option:
http://www.eteks.com/pja/en/
0
 
LVL 35

Accepted Solution

by:
TimYates earned 1000 total points
ID: 9746346
Try running tomcat with

-Djava.awt.headless=true

in the parameters (NOTE! small "h")

Tim
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9746362
Ahhhh...just saw you are creating a JFrame...

Not sure what happens with that, but I'd try the headless param first...
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
Suggested Courses
Course of the Month12 days, 9 hours left to enroll

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question