Jersey REST Sample

HelpApi.java

package org.hello.web.api;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;

import org.hello.web.models.Result;

@Path("/help")
public class HelpApi {
	@GET
	@Path("/version")
	@Produces(MediaType.TEXT_PLAIN)
	public String version() {
		return "1.0.0";
	}
	
	@GET
	@Path("/status")
	@Produces(MediaType.APPLICATION_JSON)
	public Result status() {
		return new Result("OK", "", "Running");
	}
}

JsonContextResolver.java

package org.hello.web;

import javax.ws.rs.ext.ContextResolver;

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonContextResolver implements ContextResolver<ObjectMapper> {

	final ObjectMapper defaultObjectMapper;
	 
    public JsonContextResolver() {
        defaultObjectMapper = createDefaultMapper();
    }
 
    public ObjectMapper getContext(Class<?> type) {
    	return defaultObjectMapper;
    }
    
    private static ObjectMapper createDefaultMapper() {
        final ObjectMapper result = new ObjectMapper();
        return result;
    }

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  
  <modelVersion>4.0.0</modelVersion>
  
  <groupId>org.hello.web</groupId>
  <artifactId>helloweb</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.containers</groupId>
      <!-- if your container implements Servlet API older than 3.0, use "jersey-container-servlet-core"  -->
      <artifactId>jersey-container-servlet</artifactId>
      <version>2.22.1</version>
    </dependency>
    <!-- Required only when you are using JAX-RS Client -->
    <dependency>
      <groupId>org.glassfish.jersey.core</groupId>
      <artifactId>jersey-server</artifactId>
      <version>2.22.1</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.media</groupId>
      <artifactId>jersey-media-json-jackson</artifactId>
      <version>2.22.1</version>
    </dependency>
  </dependencies>
</project>

Result.java

package org.hello.web.models;

public class Result {
	private String status;
	private String data;
	private String message;
	
	public Result(final String status, final String data, final String message) {
		this.status = status;
		this.data = data;
		this.message = message;
	}
	
	public String getStatus() {
		return status;
	}
	public String getData() {
		return data;
	}
	public String getMessage() {
		return message;
	}
}

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>api-serlvet</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
      <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>org.hello.web.api</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
      <servlet-name>api-serlvet</servlet-name>
      <url-pattern>/api/*</url-pattern>
    </servlet-mapping>
</web-app>