GWT: How to extract a content of a javascript function using (JSNI) - gwt

Question

I am calling a javascript function from gwt client side using JSNI like follow:
anchor.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
execute(notification.getActionCode(), notification.getParams());
}
});
private static native String execute(String functionName, String params)/*-{
try{
$wnd[functionName](params);
}catch(e){
alert(e.message);
}
}-*/;
My problem is that my javascript function contains window.open("ServletName?....").
When clicking on the anchor, the window opened with error below:
The requested resource (/es/gwt/core/ServletName) is not available.
if i replace window.open("ServletName?....") by window.open("../../ServletName?...."), the window open successfully, but these javascript functions are used also outside gwt so i cant modify it .
I dont know why the part /gwt/core is being added to the url which is causing the problem.
Is there a way in gwt before executing the javascript function, to extract its content and adding the "../.." before the url? i mean heaving the javascript function name, can we get its content before calling the execute function? in my case my javascript function is a follow:
function everlinked_AddSpace(spaceId){
window.open('ELUtilities?Service=Space&action=homePage&SpaceId='+spaceId+'&Template=apps/everlinked/templates/spaces/space_main.htm','_blank');;
}
i need to modify it in gwt client side and call it with the new modifications.
I appreciate if someone could help me.

Answer 1

I think you are trying to resolve your problem using a bad approach.
The easier way is to use an url re-writer, or to modify your web.xml url-pattern to route the relative path sent by your gwt app to the same servlet.
Probably you have in your web.xml something like this:
<servlet>
<servlet-name>myservlet</servlet-name>
<servlet-class>maynamespace.ServletName</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>myservlet</servlet-name>
<url-pattern>/ServletName</url-pattern>
</servlet-mapping>
So you can add this block to your web.xml.
<servlet-mapping>
<servlet-name>myservlet</servlet-name>
<url-pattern>/es/gwt/core/ServletName</url-pattern>
</servlet-mapping>
Note that url-pattern has a very limited set of regular expressions (/path/* and *.ext), so in your case you have to write the full path.