RESTful服务HTTP状态500 Servlet.init（）错误

Question

这是我的名为Person.java的java类的代码：

package forage;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Person {

    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }

    public Person() {

        id = -1;
        firstName = "";
        lastName = "";
        email = "";

    }

    public Person(long id, String firstName, String lastName, String email) {

        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }


    private long id;
    private String firstName;
    private String lastName;
    private String email;

}

这是我创建Personresources.java的资源代码：

 package forageresource;
    import javax.ws.rs.Path;
    import javax.ws.rs.Produces;
    import javax.ws.rs.Consumes;
    import javax.ws.rs.GET;
    import javax.ws.rs.POST;
    import javax.ws.rs.PathParam;
    import javax.ws.rs.core.Context;
    import javax.ws.rs.core.MediaType;
    import javax.ws.rs.core.MultivaluedMap;
    import javax.ws.rs.core.UriInfo;
    import javax.ws.rs.core.Request;

import forage.Person;

@Path("/person")
public class PersonResource {

    private final static String FIRST_NAME = "firstName";
    private final static String LAST_NAME = "lastName";
    private final static String EMAIL = "email";

    private Person person = new Person(1, "Sample", "Person", "sample_person@jerseyrest.com");

    // The @Context annotation allows us to have certain contextual objects
    // injected into this class.
    // UriInfo object allows us to get URI information (no kidding).
    @Context
    UriInfo uriInfo;

    // Another "injected" object. This allows us to use the information that's
    // part of any incoming request.
    // We could, for example, get header information, or the requestor's address.
    @Context
    Request request;

    // Basic "is the service running" test
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String respondAsReady() {
        return "Demo service is ready!";
    }

    @GET
    @Path("sample")
    @Produces(MediaType.APPLICATION_JSON)
    public Person getSamplePerson() {

        System.out.println("Returning sample person: " + person.getFirstName() + " " + person.getLastName());

        return person;
    }

    // Use data from the client source to create a new Person object, returned in JSON format.  
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Produces(MediaType.APPLICATION_JSON)
    public Person postPerson(
            MultivaluedMap<String, String> personParams
            ) {

        String firstName = personParams.getFirst(FIRST_NAME);
        String lastName = personParams.getFirst(LAST_NAME);
        String email = personParams.getFirst(EMAIL);

        System.out.println("Storing posted " + firstName + " " + lastName + "  " + email);

        person.setFirstName(firstName);
        person.setLastName(lastName);
        person.setEmail(email);

        System.out.println("person info: " + person.getFirstName() + " " + person.getLastName() + " " + person.getEmail());

        return person;

    }
}

Web.xml中：

<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID"
    version="3.0">
  <display-name>JerseyRESTServer</display-name>
  <servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>Person</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app>

最后是错误：

 HTTP Status 500 - Servlet.init() for servlet Jersey REST Service threw exception

    type Exception report

    message Servlet.init() for servlet Jersey REST Service threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet Jersey REST Service threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
    org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
    com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1359)
    com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:180)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:799)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:795)
    com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:790)
    com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:509)
    com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:339)
    com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:207)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:577)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
    org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.15 logs.

Apache Tomcat/8.0.15

我是REST服务的新手，我不知道出了什么问题。请指导我 我正在使用Apache Tomcat 8.0，Eclipse火星和我从这个网站引用： http://avilyne.com/?p=105