maiconramones,
You can add arguments to a server in MyEclipse 2015 as well :
1. Double click on the Glassfish server in the Servers view. This displays an Overview of the server.
2. Click on the ‘Open launch configuration’ link and switch to the ‘Arguments’ tab.
Please refer to our updated documentation here.
Here is the screenshot for your reference :
Let us know how it works for you.[/url]