Question

Using Spring 3.0.5, I am trying to return a list of strings in JSON format.

• I read the post spring-mvc-json-response

• I have available to me jackson-mapper code 1.4.2 and it’s on my classpath.

• I am also using <context:component-scan base-package="com.funfun.foofoo2" /> which should satisfy the <mvc:annotation-driven> requirement.

• I am returning a List<String> although I have tried just a bean too.

• When I return raw JSON as a String, it works.

What is the following log output telling me? Is it saying it cannot find the Jackson JSON Mapper and thus the MappingJacksonHttpMessageConverter is not loaded?

17:19:01,037 DEBUG [AnnotationMethodHandlerExceptionResolver:132] Resolving exception from handler [com.funfun.foofoo2.CarModelsController@181fa4b]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

17:19:01,037 DEBUG [ResponseStatusExceptionResolver:132] Resolving exception from handler [com.funfun.foofoo2.CarModelsController@181fa4b]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

17:19:01,037 DEBUG [DefaultHandlerExceptionResolver:132] Resolving exception from handler [com.funfun.foofoo2.CarModelsController@181fa4b]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
17:19:01,053 DEBUG [DispatcherServlet:824] Null ModelAndView returned to DispatcherServlet with name 'appServlet': assuming HandlerAdapter completed request handling

Update: I am using jQuery’s getJSON. In Firefox Firebug, I see the header coming over as application/json. The Spring method is constrained to only handle requests for JSON.

Answer 1

You need more than jackson-mapper, you need jackson-core as well, and preferably something newer than the rather old 1.4.x versions.