I'm trying to call a Java method form a part of Javascript code.
I've read Accessing Java Methods and Fields from JavaScript and I
think I've reproduced something equivalent but it does not work.
Here is my HTML page :
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://
www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<script type="text/javascript" language="javascript">
var abcd = getJavaValue();
</script>
<script type="text/javascript" language="javascript"
src="com.eloquant.test.test.nocache.js"></script>
</head>
<body>
</body>
</html>
Here is the java code :
package com.eloquant.test.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
public class Test implements EntryPoint {
public void onModuleLoad() {
exportStaticMethod();
RootPanel.get().add(new HTML ("abcd =" + getAbcd()));
}
public static int getValue() {
return 1;
};
public static native void exportStaticMethod() /*-{
$wnd.getJavaValue = @com.eloquant.test.client.Test::getValue();
}-*/;
public native int getAbcd () /*-{
return $wnd.abcd;
}-*/;
}
When I run the app I get the following error :
com.google.gwt.dev.shell.HostedModeException: Expected primitive type
int; actual value was undefined
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:51)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeInt(ModuleSpace.java:
193)...
If I replace in the HTML
var abcd = getJavaValue();
By
var abcd = 5;
I've got a correct display, so Java calling Javascript is Ok, but I
don't understand what's wrong with javascript calling java.
Does any one have some ideas ?
Thanks for reading
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