在~/.bashrc環境變量文件最下方加入：
export DISPLAY=:0.0
然后，刷新環境變量以使其生效：
source ～/.bashrc
參考：http://stackoverflow.com/questions/662421/no-x11-display-variable-what-does-it-mean
Linux下運行Java項目時，出現No X11 DISPLAY variable was set, but this program performed an operation which requires it.的問題解決
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