What？

Jackson is a Java JSON API which provides several different ways to work with JSON. Jackson is one of the most popular Java JSON APIs out there.
https://github.com/FasterXML/jackson

总结一下：
流行的Java JSON API

Why？

Jersey 默认集成的Moxy 不是太好用，抑或是我自己没搞明白
示例如下：

public class ResObject<T> {
    private String code;
    private String message;
    private T data;
}

以上为通用的接口返回对象，若基于Jersey2.X在返回时会出现异常，例如：

//相应对象泛型为基础类型
ResObject<Integer> res = new ResObject<>();
res.setData(1);

How？

添加maven依赖

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>${jersey.version}</version>
</dependency>

修正Jersey配置方式一(javax.ws.rs.Application)

<servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>javax.ws.rs.Application</param-name>
        <param-value>AppsResource</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

-修正Jersey配置方式二（web.xml配置）

<servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.disableAutoDiscovery</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.ws.jaxrs.jersey;org.codehaus.jackson.jaxrs</param-value>
        </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

注：需要禁用Jersey的自动扫描选型来禁用Moxy

参考:
Jersey 使用参考
 Jersey 配置属性
 Jersey Guide
Jersey 集成Jackson