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
Try configuring ContentNegotiationManagerFactoryBean in Spring XML config, see Spring docs
Set favorPathExtension to false and update method's #RequestMapping like so
#RequestMapping(value="/new", method=RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
In your AJAX request, you're using
http://localhost:8080/Frontend/app/new
And your servlet declares URL "/new", you should use "/app/new" instead.
#RequestMapping(value="/app/new", method=RequestMethod.GET)
Related
I want to expose service with Spring framework (not with spring boot). Then i can use the service to feed a dashboard. Charts in the dashboard need data with json format. My question is similar to this topic but with more question about code.[question]: Expose Service Layer directly in spring mvc
I first did the model, repository to access database. I am using Hibernate and MySQL. I run my application with a class containing the main method. Then i tried to add a rest controller to access the method findAll. But when i deployed the application on Tomcat, i only get the message 404 not found.
This is my first controller
#RestController
#RequestMapping("/fruit")
public class FruitController {
#Autowired
private IFruitRepository fruitRepo = new FruitRepository();
#RequestMapping( value = "/all", method = RequestMethod.GET )
public #ResponseBody List<Port> getFruit() {
List<Fruit> res = fruitRepo.findAll();
return res;
}
}
this is the interface
public interface IFruitRepository {
Boolean create(Fruit p);
Fruit findById(int id);
List<Fruit> findAll();
Fruit update(Fruit f);
boolean delete(int id);
}
this is the implementation of findAll method
public List<Fruit> findAll(){
List<Fruit> à_retourner = new ArrayList<>();
try (SessionFactory factory = HibernateUtil.getSessionFactory()) {
Session session = factory.openSession();
Query query = session.createQuery("from Fruit");
à_retourner = query.getResultList();
} catch (Exception e) {
System.out.println("exception _ findAll _ Fruit : " + e);
}
return à_retourner;
}
EDIT:
web .xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.form</url-pattern>
</servlet-mapping>
</web-app>
dispacher-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>
applicationcontext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
</beans>
Should i add servlet , dispacher servlet , application context to find the resource through URI ?
I don't know what is exactly the url you are using to test the service but if you are trying to invoke /fruit/all, it won't work because the servlet dispatcher is configured to handle request that ends with .form. To make it work you should change the url-pattern of the servlet dispatcher to something like /fruit/*
i had some problem showing images retrieved by my db.
View caller:
<p:graphicImage value="#{appController.image}" height="200 px" >
<f:param name="oid" value="#{item.oid}" />
</p:graphicImage>
Controller:
#Named("appController")
#ApplicationScoped
public class AppController {
#Inject
private MultimediaFacade multimediaFacade;
public StreamedContent getImage() throws IOException {
System.out.println("getting image")
FacesContext context = FacesContext.getCurrentInstance();
if (context.getCurrentPhaseId() == PhaseId.RENDER_RESPONSE) {
// So, we're rendering the HTML. Return a stub StreamedContent so that it will generate right URL.
return new DefaultStreamedContent();
} else {
// So, browser is requesting the image. Return a real StreamedContent with the image bytes.
String imageId = context.getExternalContext().getRequestParameterMap().get("oid");
int oid=Integer.parseInt(imageId);
System.out.println(oid);
Multimedia image = multimediaFacade.find(oid);
System.out.println(Arrays.toString(image.getFileBlob()));
return new DefaultStreamedContent(new ByteArrayInputStream(image.getFileBlob()));
}
}
}
this code shows nothing and it looks like the method is never called (never print in console)!
after days of trial changing the scope, i tried to use #ManagedBean instead of #Named, and it works!!!
can someone explain me why this work only with #ManagedBean and not with #Named?
Check that you have javax.enterprise.context.ApplicationScoped in imports.
If you have a different import for #ApplicationScoped (e.g. javax.faces.bean.ApplicationScoped), then you need to configure CDI to discover all beans instead of only those with CDI annotations (which is the default)
To tun discovery for all beans, either add empty beans.xml into WEB-INF directory, or if you already have beans.xml there, add bean-discovery-mode="all" into the <beans> element, like this:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
bean-discovery-mode="annotated">
</beans>
I have a simple controller, which should return JSON, but is failing to do so. The JSON library is Jackson, configured as a maven dependency. When I make a request using postman, against this url path, I am receiving a 404 error. When I attempt to inspect the JSON Returned, I see "Malformed JSON: Unexpected '<'".
Could someone suggest what it is I am missing / failing to understand? Thank you
#RestController
#RequestMapping("/World/")
public class RestfulController {
#RequestMapping(value = "/Country/", method = RequestMethod.GET, produces="application/json")
public ResponseEntity<Country> findAllCountrys(){
Country c = new Country(1, "Ethiopia", "Addis Abba", "94 Million");
return new ResponseEntity<Country>(c, HttpStatus.OK);
}
}
spring application context
<beans xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.restfulapp.controller"/>
<mvc:annotation-driven/>
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
</map>
</property>
</bean>
You should try this:
#RestController
#RequestMapping("/World")
public class RestfulController {
#RequestMapping(value = "/Country", method = RequestMethod.GET)
public Country findAllCountrys(){
Country c = new Country(1, "Ethiopia", "Addis Abba", "94 Million");
return c;
}
}
The request url: http://yourhost/World/Country
This should return a json of Country
I have written a spring MVC application using the spring tools for eclipse and deployed it onto an tomcat 7 environment on AWS Elastic Beanstalk. But when I try to return JSON I get the following error.
406- The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.
But when I run the same application locally on glassfish server it runs perfectly and returns the intended json as follows:
{"id":1,"message":"Hello, World!","description":"Hello, World!"}
Here is my code:
Controller code :
private static final String template = "Hello, %s!";
private final AtomicInteger counter = new AtomicInteger();
#RequestMapping(value = "/greeting",headers="Accept=*/*",method = RequestMethod.GET)
public #ResponseBody ResponseBean greeting(#RequestParam(value="name", required=false, defaultValue="World") String name,HttpServletResponse response , ModelMap model){
response.setContentType("application/json");
return new ResponseBean(counter.incrementAndGet(),String.format(template, name),String.format(template, name));
}
My Response Bean Code :
package com.ramesh.beans;
public class ResponseBean {
private final int id;
private final String message;
private final String description;
public ResponseBean(int id,String message,String desc){
this.id = id;
this.message = message;
this.description = desc;
}
public int getId() {
return id;
}
public String getMessage() {
return message;
}
public String getDescription() {
return description;
}
}
My servlet-context.xml file :
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans
xmlns="http://www.springframework.org/schema/mvc"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<!-- DispatcherServlet Context: defines this servlet's request-processing
infrastructure -->
<!-- Enables the Spring MVC #Controller programming model -->
<mvc:annotation-driven />
<!-- Handles HTTP GET requests for /resources/** by efficiently serving
up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />
<!-- Resolves views selected for rendering by #Controllers to .jsp resources
in the /WEB-INF/views directory -->
<beans:bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<context:component-scan base-package="com.ramesh.ws" />
</beans:beans>
Could anyone please help me out ?. I am willing to provide any more information about my program if needed.
My request headers on chrome are as follows :
They are as follows :
1 requests ❘ 1.3 KB transferred ❘ 250 ms (load: 256 ms, DOMContentLoaded: 257 ms)
HeadersPreviewResponseTiming
Remote Address:54.206.99.113:80
Request URL:http://ramesh-dev-gvssfipguk.elasticbeanstalk.com/greeting
Request Method:GET
Status Code:406 Not Acceptable
Request Headers
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6,ms;q=0.4
Cache-Control:max-age=0
Connection:keep-alive
Host:ramesh-dev-gvssfipguk.elasticbeanstalk.com
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36
Response Headers
Connection:keep-alive
Content-Length:1070
Content-Type:text/html;charset=utf-8
Date:Tue, 20 May 2014 10:14:45 GMT
Server:Apache-Coyote/1.1
X-Cache:MISS from tx33vspep22a
I finally fixed it by updating my controller method as shown below:
#RequestMapping(value = "/greeting",produces="application/json",method = RequestMethod.GET)
public #ResponseBody ResponseBean greeting(#RequestParam(value="name", required=false, defaultValue="World") String name,HttpServletResponse response , ModelMap model){
response.setContentType("application/json");
return new ResponseBean(counter.incrementAndGet(),String.format(template, name),String.format(template, name));
}
It seems when deploying to tomcat I need the produces="application/json" property.
I'm not sure whether this is a misconfiguration on my part, a misunderstanding of what can be accomplished via #ModelAttribute and automatic JSON content conversion, or a bug in either Spring or Jackson. If it turns out to be the latter, of course, I'll file an issue with the appropriate folks.
I've encountered a problem with adding a #ModelAttribute to a controller's handler method. The intent of the method is to expose a bean that's been populated from a form or previous submission, but I can reproduce the issue without actually submitting data into the bean.
I'm using the Spring mvc-showcase sample. It's currently using Spring 3.1, but I first encountered, and am able to reproduce, this issue on my 3.0.5 setup. The mvc-showcase sample uses a pretty standard servlet-context.xml:
servlet-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xsi:schemaLocation="
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
<!-- Enables the Spring MVC #Controller programming model -->
<annotation-driven conversion-service="conversionService">
<argument-resolvers>
<beans:bean class="org.springframework.samples.mvc.data.custom.CustomArgumentResolver"/>
</argument-resolvers>
</annotation-driven>
<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources/ directory -->
<resources mapping="/resources/**" location="/resources/" />
<!-- Resolves views selected for rendering by #Controllers to .jsp resources in the /WEB-INF/views directory -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<!-- Imports user-defined #Controller beans that process client requests -->
<beans:import resource="controllers.xml" />
<!-- Only needed because we install custom converters to support the examples in the org.springframewok.samples.mvc.convert package -->
<beans:bean id="conversionService" class="org.springframework.samples.mvc.convert.CustomConversionServiceFactoryBean" />
<!-- Only needed because we require fileupload in the org.springframework.samples.mvc.fileupload package -->
<beans:bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
</beans:beans>
The controllers.xml referenced in the file simply sets up the relevant component-scan and view-controller for the root path. The relevant snippet is below.
controllers.xml
<!-- Maps '/' requests to the 'home' view -->
<mvc:view-controller path="/" view-name="home"/>
<context:component-scan base-package="org.springframework.samples.mvc" />
The test bean which I am attempting to deliver is a dead-simple POJO.
TestBean.java
package org.springframework.samples.mvc.test;
public class TestBean {
private String testField = "test#example.com";
public String getTestField() {
return testField;
}
public void setTestField(String testField) {
this.testField = testField;
}
}
And finally, the controller, which is also simple.
TestController.java
package org.springframework.samples.mvc.test;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
#RequestMapping("test/*")
public class TestController {
#ModelAttribute("testBean")
public TestBean getTestBean() {
return new TestBean();
}
#RequestMapping(value = "beanOnly", method = RequestMethod.POST)
public #ResponseBody
TestBean testBean(#ModelAttribute("testBean") TestBean bean) {
return bean;
}
#RequestMapping(value = "withoutModel", method = RequestMethod.POST)
public #ResponseBody
Model testWithoutModel(Model model) {
model.addAttribute("result", "success");
return model;
}
#RequestMapping(value = "withModel", method = RequestMethod.POST)
public #ResponseBody
Model testWithModel(Model model, #ModelAttribute("testBean") TestBean bean) {
bean.setTestField("This is the new value of testField");
model.addAttribute("result", "success");
return model;
}
}
If I call the controller via the mapped path /mvc-showcase/test/beanOnly, I get a JSON representation of the bean, as expected. Calling the withoutModel handler delivers a JSON representation of the Spring Model object associated with the call. It includes the implicit #ModelAttribute from the initial declaration in the return value, but the bean is unavailable to the method. If I wish to process the results of a form submission, for example, and return a JSON response message, then I need that attribute.
The last method adds the #ModelAttribute, and this is where the trouble comes up. Calling /mvc-showcase/test/withModel causes an exception.
In my 3.0.5 installation, I get a JsonMappingException caused by a lack of serializer for FormattingConversionService. In the 3.1.0 sample, the exception is caused by lack of serializer for DefaultConversionService. I'll include the 3.1 exception here; it seems to have the same root cause, even if the path is a bit different.
3.1 org.codehaus.jackson.map.JsonMappingException
org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.springframework.format.support.DefaultFormattingConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.testBean"]->org.springframework.validation.BeanPropertyBindingResult["propertyAccessor"]->org.springframework.beans.BeanWrapperImpl["conversionService"])
at org.codehaus.jackson.map.ser.StdSerializerProvider$1.failForEmpty(StdSerializerProvider.java:89)
at org.codehaus.jackson.map.ser.StdSerializerProvider$1.serialize(StdSerializerProvider.java:62)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:272)
at org.codehaus.jackson.map.ser.BeanSerializer.serializeFields(BeanSerializer.java:175)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:147)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:272)
at org.codehaus.jackson.map.ser.BeanSerializer.serializeFields(BeanSerializer.java:175)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:147)
at org.codehaus.jackson.map.ser.MapSerializer.serializeFields(MapSerializer.java:207)
at org.codehaus.jackson.map.ser.MapSerializer.serialize(MapSerializer.java:140)
at org.codehaus.jackson.map.ser.MapSerializer.serialize(MapSerializer.java:22)
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:315)
at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:242)
at org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1030)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.writeInternal(MappingJacksonHttpMessageConverter.java:153)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:181)
at org.springframework.web.servlet.mvc.method.annotation.support.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:121)
at org.springframework.web.servlet.mvc.method.annotation.support.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:101)
at org.springframework.web.servlet.mvc.method.annotation.support.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:81)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:64)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMethodAdapter.invokeHandlerMethod(RequestMappingHandlerMethodAdapter.java:505)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMethodAdapter.handleInternal(RequestMappingHandlerMethodAdapter.java:468)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
...
So, is there some configuration I am missing that should allow the Jackson converter to properly handle a response derived from a handler with #ModelAttribute in the method signature? If not, any thoughts as to whether this is more likely a Spring bug or a Jackson bug? I'm leaning toward Spring, at this point.
It looks like a Spring config problem, when serializing to JSON the DefaultFormattingConversionService is empty and Jackson (by default) will throw an exception if a bean is empty see FAIL_ON_EMPTY_BEANS in the features documentation. But I am not clear why the bean is empty.
It should work if you set FAIL_ON_EMPTY_BEANS to false, but still doesn't really explain why it is happening in the first place.
DefaultFormattingConversionService is new to 3.1 - it extends the FormattingConversionService which explains the different exceptions between 3.0.5 and 3.1.
I do not think it is a Jackson problem, although a new version of Jackson (1.8.0) was released only 3 days ago so you could try that also.
I will try to reproduce this locally.