Thanks Vitali Lovich, i solved the problem. As Vitali lovich said I
was calling function2 in a wrong way(I am new to gwt).
If someone has the same problem this link explains JSNI.
http://googlewebtoolkit.blogspot.com/2008/07/getting-to-really-know-gwt-part-1-jsni.html

On Apr 4, 8:55 am, Vitali Lovich <[email protected]> wrote:
> You're callling it wrong.  You still needs to call function2 using
> JSNI because the GWT compiler will mangle the name of function2 but
> won't realize that it needs to update the reference in the javascript
> code you are writing.
>
> 2009/4/3 alberto <[email protected]>:
>
>
>
> > Hi
>
> > I have theese two native javascript functions: (just a simply example)
>
> > public native void function1( ) {
> >  alert(  function2( )  );
> > }
>
> > public native int function2( ) {
> >  return 9;
> > }
>
> > It seems that function1 can not see and invoke function2.
> > Is that true? Is there a way to resolve that problem??
>
> > Thank yuo
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