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java.awt.HeadlessException

Posted on 2003-11-13
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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.
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Question by:sapientconceptions
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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)
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by:objects
ID: 9745519
Depends what version of Java u are running on the server.
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Expert Comment

by:objects
ID: 9745524
This may be an option:
http://www.eteks.com/pja/en/
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TimYates earned 250 total points
ID: 9746346
Try running tomcat with

-Djava.awt.headless=true

in the parameters (NOTE! small "h")

Tim
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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...
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