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java.awt.HeadlessException:

No X11 DISPLAY variable was set, but this program performed an operation which requires it.

at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:159)

at java.awt.List.(List.java:216)

at java.awt.List.(List.java:171)

at com.mail.MailSendWork.(MailSendWork.java:40)

at com.mail.MailWorker.run(MailWorker.java:30)

at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)

at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)

at java.lang.Thread.run(Thread.java:595)

在 java classname 中間加上 -Djava.awt.headless=true

再次執行還是報錯

java.awt.HeadlessException

at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:159)

at java.awt.List.(List.java:216)

at java.awt.List.(List.java:171)

at com.mail.MailSendWork.(MailSendWork.java:40)

at com.mail.MailWorker.run(MailWorker.java:30)

at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)

at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)

at java.lang.Thread.run(Thread.java:595)

看來不好使，刪掉。在環境變量中加入 export DISPLAY=localhost:0 再次執行 ，OK！

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