Specifying JVM arguments when calling a jar file?

Do it like:

java -Xms256m -Xmx512m -Djava.awt.headless=true -jar filename.jar

java [Options] -jar  [jarfile] [Command Line Arguments]

Please refer

http://docs.oracle.com/javase/7/docs/technotes/tools/windows/java.html

Don't put a space between the -D and java.awt.headless=true.

It should be -Djava.awt.headless=true.

hype jar was missing , try

java -Xms256m -Xmx512m -Djava.awt.headless=true -jar

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