Problems of running java program by crontab in Linux

I have a java application program which runs great when started in command line, or in shell script, or Perl. However, when it is started by crontab in Linux, it stops in the middle when images are to be generated. I guess there might be some settings I need to handle in order to run this java application by crontab. We tried to start the shell script or Perl program in which the java program was invoked, but still didn't work.
This may be a littler stretching. Does anyone have similar experience and success?
Thanks in advance.
ljiang006

Dear dpz,
We have used JComponents. Here's the error message I got. Could you further suggest what to do in my crobtap (which is "11 14 * * * java -classpath /home/VeggieB VHpack.VegHealthFrac" ). Looking forward to your reply. Thanks. ljiang006.
Generate data and image products ...
Save calibrated (unsmoothed) NDVI and T into Product/NDT/
Save initial early products into Product/Initial/
Save temporary products into Product/Tempo/
Save final update products into Product/Final/
Save calibrated (unsmoothed) NDVI and T into: Product/NDT/ Exception in thread "main" java.lang.NoClassDefFoundError
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:130)
     at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62)
     at sun.awt.motif.MToolkit.<clinit>(MToolkit.java:70)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:130)
     at java.awt.Toolkit$2.run(Toolkit.java:712)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:703)
     at java.awt.Component.getToolkitImpl(Component.java:826)
     at java.awt.Component.getToolkit(Component.java:810)
     at java.awt.Component.createImage(Component.java:2564)
     at VHpack.ImageGenerator.createDataImage(ImageGenerator.java:395)
     at VHpack.ImageGenerator.makeImage(ImageGenerator.java:288)
     at VHpack.ImageGenerator.saveImage(ImageGenerator.java:162)
     at VHpack.LVItoProduct.SaveProduct(LVItoProduct.java:146)
     at VHpack.LVItoProduct.generateProducts(LVItoProduct.java:61)
     at VHpack.NoGuiVeg.<init>(NoGuiVeg.java:94)
     at VHpack.VegHealthFrac.main(VegHealthFrac.java:34)

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Message was edited by:
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Problems of running java program by crontab in Linux

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