I have some huge trouble receiving JSON from my simple Spring Controller although I checked against many other tutorials and even the official spring blog and could not find any difference, so please help me.
So my dependencies in my project are:
- spring-context 3.2.2 RELEASE
- spring-web 3.2.2 RELEASE
- spring-webmvc 3.2.2 RELEASE
- spring-test 3.2.2 RELEASE
- junit 4.10
- servlet-api 2.5
- atmosphere-runtime 1.1.0 RC4
- logback-classic 1.0.13
- libthrift 0.9.0
- jackson-mapper-asl 1.9.12
- jackson-core-asl 1.9.12
My Controller is very simple and just generates a random UUID and returns it. It looks as follows:
@Controller
public class SimpleController {
@RequestMapping(value="/new", method=RequestMethod.GET)
public @ResponseBody SimpleResponse new() throws JsonGenerationException, JsonMappingException, IOException {
SimpleResponse sr = new SimpleResponse();
sr.setId(UUID.randomUUID().toString());
return sr;
}
}
The model is just a simple POJO like
public class SimpleResponse {
private String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
Configuration is done like this
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
<display-name>SimpleTest</display-name>
<servlet>
<servlet-name>app</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>app</servlet-name>
<url-pattern>/app/*</url-pattern>
</servlet-mapping>
</web-app>
and
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="de.tum.ibis.wsc" />
</beans>
So thats the server side. On the client side I have a html page with just one line of jQuery code
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery.js"></script>
<script>
$(document).ready(function() {
$.getJSON("http://localhost:8080/Frontend/app/new", function(data) { console.log("it works"); });
});
</script>
</head>
<body>
</body>
</html>
Now according to everything I have read this should work but it does not for me. If I call localhost:8080/Frontend/app/new directly in my browser I get something like this: {"id":"b46b8d67-5614-44ed-90ef-d2da14d260f6"} and Firebug tells me that the response header from the server is
HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Server: Jetty(7.6.5.v20120716)
so content-type should be fine. Well if I now run the jquery ajax call I get the error "JSON.parse: unexpected end of data " in jquery.js and I have no cloue why. I hope anybody can help me with that. Thanks!
------ Update ------
Firebug: jQuery error
Firebug: All I get
Firebug: This is what I get if a access the url directly
text/html(which is not correct), while your JSON request is asking forapplication/json. You should try to use a REST client (Firefox has an addon for it I think) and see if that's causing the problem or not. I think that your Spring controller is only mapped on text/html requests.Accept: application/json?