with the attempt to load the javascript in the constructor of Gmap(), problems occur within icefaces-compat.js at the following line:-

new ActiveXObject('Microsoft.XMLHTTP');

as well as getting state saving issue (as reported by Adnan above). that's just in loading the application itselft. Can step over that and then why trying to load gmap page get the following:-

com.sun.faces.application.view.StateHolderSaver
class java.lang.ClassCastException

switched to try and load from "head" to "body", but still got same exception.

Try to load the script tag in the Renderer, but what happens if you have multiple gmap components on same page?

server exception:-

javax.faces.FacesException: Unexpected error restoring state for component with id javax_faces_location_BODY. Cause: java.lang.ClassCastException: com.sun.faces.application.view.StateHolderSaver.
at com.sun.faces.application.view.StateManagementStrategyImpl$1.visit(StateManagementStrategyImpl.java:250)
at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:147)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1476)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1487)
at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:234)
at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:177)
at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:119)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:438)
at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:144)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:182)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:107)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:613)
Caused by: java.lang.ClassCastException: com.sun.faces.application.view.StateHolderSaver
at javax.faces.component.UIComponentBase.restoreState(UIComponentBase.java:1422)
at com.sun.faces.application.view.StateManagementStrategyImpl$1.visit(StateManagementStrategyImpl.java:242)
... 25 more

For Gmap compat, need to inject it's external JS link in the body section when it is rendered to the page. This technique also needs to ensure that it is only added once per page, so first one wins, and the subsequent gmaps just check to see if the link is already there (and then do not add it again themselves).

the problem with state-saving is the component.addResource call, so remove it and just add script tag.
However, in the GMap class, encodeBegin(), this just puts the tag within the gmap container and for it to be loaded, the script tag needs to be closed before the beginning of the gmap container. Will try to do this in the renderer class before using a script renderer which listens for the gmap class (using ComponentSystemEventListener)

Fixed.