There is a process already using the admin port 4848

There is a process already using the admin port 4848 -- it probably is another instance of a GlassFish server.
Command start-domain failed.

如果啓動glassfish出現這樣的錯誤，請在你電腦裏的host文件修改一下，比如我電腦的目錄位置爲C:\Windows\System32\drivers\etc下

就是它了。

上圖寫你的IP地址，WEI是我電腦的hostname，就是電腦名稱，修改保存後，就可以啓動成功了