Is it Safe for a Class in Server package to access a method in Client package in GWT?

Ok, I am uisng GWTP, it got Client, Server & Shared package.

I have a Util class in client.

my.client.Util.java{    public static String method1();    //more methods here  }  

In server i have

my.server.GetDataActionHandler{      ///Should I do like this      String s=my.client.Util.method1();  }  

Is it safe to do that or I should put Util into shared package, like this

my.shared.Util.java{    public static String method1();    //more methods here  }  

What is the different if we put a Util in shared package? is it safer or any other good reasons?

(http://stackoverflow.com/questions/22839955/is-it-safe-for-a-class-in-server-package-to-access-a-method-in-client-package-in)

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