I guess many people think this question has duplicated ones. However, this question precisely asks
how can I run Java where !GraphicsEnvironment.isHeadless() returns true
The answer would be like
java --gui=disabled -jar hoge.jar
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kensuke1984
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2Do you mean `-Djava.awt.headless=true`? – Kayaman Mar 20 '20 at 09:13
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ah, thank you very much! – kensuke1984 Mar 23 '20 at 06:01
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For [Setting headless mode programmatically](https://stackoverflow.com/questions/2552371/setting-java-awt-headless-true-programmatically) – Kayaman Mar 24 '20 at 09:57
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The commandline parameter -Djava.awt.headless=true can be used to set the headless mode from the commandline.
The linked question shows ways to set it programmatically, which is somewhat trickier but may be preferrable if you don't want or can't access the commandline parameters.
Kayaman
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