JBoss Tools seems to start server with different parameters/settings. You can see actuall command in debug view through Properties popup menu on server istance
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-744405-18873/450-342/SereverInstanceProperties.png
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-744405-18874/450-382/SereverInstancePropertiesDialog.png
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