Just got my problem fixed, it's because JFreeChart calls Java2D, which requires a
display environment, which is not available on the Linux server. So, I changed the batch
file to add -Djava.awt.headless=true to tell JVM to use a headless display. See below link
for details:
http://java.sun.com/products/java-media/2D/reference/faqs/index.html#Q_I_...
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