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GWT RequestBuilder problem
String url = "http://localhost:8080/my-spring-example/hello.htm";
RequestBuilder rb = new RequestBuilder(RequestBuilder.GET, url);
RequestCallback callback = new RequestCallback() {
 public void onError(Request request, Throwable exception) {
  spring.setHTML("Die Daten konnten nicht geladen werden");
 }

 public void onResponseReceived(Request request, Response response) {
  String responseAsText = response.getText();
  if (responseAsText.equals("") || responseAsText == null ){
   spring.setHTML("Der String ist leer");
  } else {
   spring.setHTML(responseAsText);
  }
 }
};

try {
 rb.sendRequest(null, callback);
} catch (RequestException e) {
 e.printStackTrace();
}

<head><title>Hello :: Spring 3 Application</title></head>
<body>
 <h1>Hello World, Spring 3.0!</h1>
 <p>Es gibt 32 Einträge</p>
</body>

<head><title>Hello :: Spring 3 Application</title></head>n
<body>n
t<h1>Hello World, Spring 3.0!</h1>n
t<p>Es gibt 32 Eintr344ge</p>n
</body>

<head><title>Hello :: Spring 3 Application</title></head>n
<body>n
t<h1>Hello World, Spring 3.0!</h1>n
t<p>Es gibt 32 Eintr344ge</p>n
</body>