REST service giving HTTP Error 415 in JAVA

Question

I am trying to make a REST service that takes in a JSON body in POST method.

So, my Service class is :

@Service
@Path("/newalert/")
public class addAlert {

    @POST 
    @Consumes(MediaType.APPLICATION_JSON)
    public Response newAlert(final Alert request) {

        System.out.println(request.alertName + " " + request.interval + " " + request.email);

        return null;


    }
}

The Alert Class:

@XmlRootElement
public class Alert {

    @XmlElement public String alertName;
    @XmlElement public String queryString;
    @XmlElement public int interval;
    @XmlElement public String email;
    @XmlElement public int hits;

}

My web.xml(if required)

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:gifalertContext.xml</param-value>
    </context-param>


    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>Rest service</servlet-name>
        <servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>com.svc</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>

    </servlet>
    <!--  URL patterns  -->
    <servlet-mapping>
        <servlet-name>Rest service</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

For reference, pom.xml (I am showing only jersey dependencies here):

<dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>2.17</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-servlet</artifactId>
            <version>${jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey.jersey-test-framework</groupId>
            <artifactId>jersey-test-framework-core</artifactId>
            <version>${jersey.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.19.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey.jersey-test-framework</groupId>
            <artifactId>jersey-test-framework-grizzly2</artifactId>
            <version>${jersey.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey.contribs</groupId>
            <artifactId>jersey-spring</artifactId>
            <version>${jersey.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-web</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-beans</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-context</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

Now I am hitting it using PostMan Rest Client:

I am getting 415 Unsupported Media. In the console, it shows an error like this:

May 19, 2016 8:59:45 PM com.sun.jersey.spi.container.ContainerRequest getEntity
SEVERE: A message body reader for Java class com.stub.Alert, and Java type class com.stub.Alert, and MIME media type application/json was not found.
The registered message body readers compatible with the MIME media type are:
*/* ->
  com.sun.jersey.core.impl.provider.entity.FormProvider
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
  com.sun.jersey.core.impl.provider.entity.FileProvider
  com.sun.jersey.core.impl.provider.entity.InputStreamProvider
  com.sun.jersey.core.impl.provider.entity.DataSourceProvider
  com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
  com.sun.jersey.core.impl.provider.entity.DocumentProvider
  com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$SAXSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$DOMSourceReader
  com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootObjectProvider$General
  com.sun.jersey.core.impl.provider.entity.EntityHolderReader

Please help me what I am doing wrong.