Question

My GWT app is throwing this exception:

Caused by: java.lang.ClassCastException: com.google.gwt.core.client.JavaScriptObject$ cannot be cast to java.lang.String

When getting the String response of this function via JSNI:

public final native String data()/*-{
    return $wnd.getdata();
}-*/;

}

Here’s the Javascript code:

  function getdata(){
    var data = MyObject.data();
    console.log(data);
    return data;
  }

I’m logging the data output from Firebug and here’s the output (to check if the js function is actually returning something):

-0.00030517578125,0.00006103515625,0.00115966796875,0.00146484375,-0.00091552734375,-0.000946044921875,-0.001983642578125,-0.003997802734375,-0.005126953125,-0.00360107421875,-0.0032958984375,-0.004119873046875,-0.00433349609375,-0.0023193359375,-0.0008544921875,-0.003448486328125,-0.00347900390625,-0.0054931640625,-0.0067138671875,-0.005279541015625,-0.006072998046875,

Answer 1

A simple solution is probably $wnd.getdata().toString(); but maybe you should try typeof $wnd.getdata() to see what the type really is — maybe it’s a bug lurking somewhere else.