在SPRING中从Ajax调用响应时显示不可接受的错误

Question

I am trying to get response in form of json array from controller class. When I tried to send request from javascript, I get "Not Acceptable" error. Please help to find b ug in my code.

This is my controller's code

@RequestMapping(value = "/ajaxvalue", method = { RequestMethod.GET }, produces=MediaType.APPLICATION_JSON_VALUE)
  public @ResponseBody Map<String, String> geResourceList(String name){
        logger.info("getAllResources() from ajax begins: ");
        Map<String, String> resourceMap = null;
        try {
            logger.info("getAllResources() from ajax begin: ");
            resourceMap = new HashMap<String, String>();
            List<ResourceModel> resourceList = resourceService
                    .getAllResources();
            java.util.Iterator<ResourceModel> resourceIterator = resourceList.iterator();
            while (resourceIterator.hasNext()) {
                ResourceModel model = resourceIterator.next();
                resourceMap.put("" + model.getResourceType(),
                        model.getName());
                logger.info("" + model.getResourceType(),
                        model.getName());
            }

        } catch (Exception e) {
            logger.debug("Error while getting location in ajax request:"
                    + e.getMessage());
            e.printStackTrace();
        }logger.info("getAllResources() from ajax ENDS: ");
        return resourceMap;
    }

This is my jquery code.

jQuery.ajax({
url: '<c:url value='/learningresources/ajaxvalue'/>',
type: 'GET',
dataType:'json',
contentType: "application/json",
cache:false,
success:function(response){
    alert(response);
},
error:function(jqXhr, textStatus, errorThrown){
    alert("error: "+errorThrown);
}
});

Answer 1

try to add request header "Accept" to ajax call.

 headers: {
    'Accept':'application/json',
 }

Answer 2

This is most likely because of not having jackson library in class path, the following are two solutions depending on your configuration.

if you are using maven then add the following dependency in pom.xml

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>${jackson.version}</version>
</dependency>

If you are manually adding the jars then goto jackson download page and download version required according to your spring version.

Make sure you get appropriate jackson version based on your spring version.