Responses with characteristics not acceptable according to the request "accept" headers - HTTP Status 406 - spring-boot - spring-boot

Question

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I am getting the not acceptable according to the request "accept" headers, however, I believe I have done everything right, I could. Can someone help to resolve this issue. I am using Spring 4.1.
The OBJECTIVE is to be able to return the response in the text/xml format. if I remove produces=text/xml directive then my application works i.e. no error, but the source system treat the response in an unexpected way.
Request coming in as follows:
curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -H "Authorization: Basic YWRtaW46YWRtaW4=" -H "Cache-Control: no-cache" -H "Postman-Token: 78637a4f-e153-4242-c922-96757d01442a" -d Then values....
My Pom:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.0.rc1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.0.rc1</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
My Controller have the following notations:
#RestController
#RequestMapping("/test")
#EnableWebMvcMy Controller has the following notations:
Main Class has the following notation
#Configuration
#EnableAutoConfiguration
#ComponentScan
I DO NOT have the application context xml, as i am using #Autowired
on my end-point method as follows
#RequestMapping(value="/IDEA", headers = {"Accept=*/*"}, produces="text/xml", method= {RequestMethod.POST, RequestMethod.GET})
#Autowired
public MyResult processMyRequest(HttpServletRequest request)
Current Log
2016-08-11 13:38:04.076 INFO 89535 --- [nio-8080-exec-2] c.f.fnocc.injestor.MyController : POST CALLED
2016-08-11 13:38:04.079 INFO 89535 --- [nio-8080-exec-2] c.f.fnocc.injestor.MyController : Request received from ipAddress:0:0:0:0:0:0:0:1
2016-08-11 13:38:04.082 INFO 89535 --- [nio-8080-exec-2] c.f.fnocc.injestor.MyController : REQUEST INFORMATION: [
2016-08-11 13:38:04.084 INFO 89535 --- [nio-8080-exec-2] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext#af3b571: startup date [Thu Aug 11 13:38:04 BST 2016]; root of context hierarchy
2016-08-11 13:38:04.095 INFO 89535 --- [nio-8080-exec-2] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-08-11 13:38:04.119 INFO 89535 --- [nio-8080-exec-2] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext#142abfa2: startup date [Thu Aug 11 13:38:04 BST 2016]; root of context hierarchy
2016-08-11 13:38:04.124 INFO 89535 --- [nio-8080-exec-2] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-08-11 13:38:04.150 ERROR 89535 --- [nio-8080-exec-2] c.f.fnocc.injestor.MyController : Error has occurred.

Answer 1

The first issue I see is #EnableWebMvc should be specified on the main class alongside the #Configuration but I don't think it is even needed when you are specifying #EnableAutoConfiguration.
The other issue is the #RequestMapping() has an attribute for consumes which is what you should probably be using instead of looking for the accept header. Reason for that is the accept header normally includes multiple media types not just */* as such the check for equality on that header wouldn't be there.
* Update * I was wrong on the consumes that is used to interpreting the Content-Type header and not the Accept header. Spring tries to match the produces to the Accept header to determine if the method can respond to the incoming request. That makes more sense why you are getting the 406 error as Spring sees the method trying to output text/xml but the request probably doesn't accept that content type in the Accept header.
To further troubleshoot you can setup a request logger to see the specifics on how the request is coming into the service to determine if there is something that is causing Spring to not process it properly. If you add the following bean and enable DEBUG level logging on org.springframework.web.filter.CommonsRequestLoggingFilterthen you can see.
#Bean
public Filter logFilter() {
CommonsRequestLoggingFilter filter = new CommonsRequestLoggingFilter();
filter.setIncludeQueryString(false);
filter.setIncludePayload(false);
filter.setIncludeHeaders(true);
return filter;
}
If you can update your question with that request log that would help to troubleshoot.
* Update #2 * Was able to reproduce the error. Adding DEBUG logging level for org.springframework.web showed the issue more clearly.
2016-08-11 02:26:58.242 DEBUG 82904 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/test/IDEA]
2016-08-11 02:26:58.244 DEBUG 82904 --- [nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /test/IDEA
2016-08-11 02:26:58.247 DEBUG 82904 --- [nio-8080-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method [public ca.tuatara.stackoverflow.MyController$MyResult ca.tuatara.stackoverflow.MyController.processMyRequest(javax.servlet.http.HttpServletRequest)]
2016-08-11 02:26:58.247 DEBUG 82904 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Last-Modified value for [/test/IDEA] is: -1
2016-08-11 02:26:58.258 DEBUG 82904 --- [nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolving exception from handler [public ca.tuatara.stackoverflow.MyController$MyResult ca.tuatara.stackoverflow.MyController.processMyRequest(javax.servlet.http.HttpServletRequest)]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
The Could not find acceptable representation is the key. By specifying that you want XML you must include a library to marshall the object as XML as described on the Spring MVC docs. Adding the dependency for:
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
</dependency>
Made it work for my sample application. Give that a try!