Method Enumeration in GWT

Hello All, I've heard it is possible to enumerate all available methods in client side. Below are some links about this:

https://github.com/GDSSecurity/GWT-Penetration-Testing-Toolset
https://blog.gdssecurity.com/labs/2010/7/20/gwtenum-enumerating-gwt-rpc-method-calls.html

My question is, is it still possible or methods are secure in client-side by default. If not, is there any way to block it.

Thanks in Advance.

Regards,
Vathsa. 

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