How I can send json response from my spring controller? - json

Question

I'm a newbie in the theme. How can I return JSON data from my controller, using something like that (using ResponseBody)
#RequestMapping(value = "/ajaxtest", method = RequestMethod.GET)
#ResponseBody
public Set<String> ajaxTest() {
Set<String> records = new HashSet<String>();
records.add("Record #1");
records.add("Record #2");
return records;
}
I tried ro use Jackson, but have http 406 error.
What correct version of Jackson should I use with Spring version 4.0.3 and what is the algoritm of using?
UPD
Ajax call
<button id="btn">Click!</button>
<script>
$("#btn").click(
function sendAjax() {
$.ajax({
url: "/ajaxtest",
dataType: "json",
success: function(data) {
alert(data);
},
error:function() {
alert("error");
}
});
})
</script>

Answer 1

For Converting to json request you must include following 3 jar to your project build path.
Jackson jar is use for convrting HTTP request to jason format.
Also mention headear=content-type=application/json
These are the jar files
jackson-mapper-asl.jar
jackson-core-asl.jar
jackson-jaxrs.jar

Answer 2

If you are using maven, you can include the following dependency in your pom.xml
Jackson Mapper Version 1 which is good enough to convert your object to JSON object:
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
Or you can also go for latest Jackson version,
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.6.0</version>
</dependency>