@JsonUnwrapped不工作，将压扁的JSON转换为自定义POJO

我想使用Jackson从JSON填充POJO。我的样品请求是-

    POST /lab2/person?firstname=John&lastname=Doe&email=john.doe@anony.com&street=190 South&city=Houston&state=TX&zip=12345 
    HTTP/1.1
    Host: localhost:8080
    Content-Type: application/json
    Cache-Control: no-cache

个人-POJO

import javax.persistence.Column;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import org.codehaus.jackson.annotate.JsonUnwrapped;
@Entity
@Table(name="person")
public class Person {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private long id;
@Column(nullable=false)
private String firstname;
@Column(nullable=false)
private String lastname;
@Column(nullable=false)
private String email;
private String description;
@Embedded
@JsonUnwrapped
private Address address;
@ManyToOne
@JoinColumn(referencedColumnName="id")
private Organization organization;
/**
 * @return the id
 */
public long getId() {
    return id;
}
/**
 * @param id the id to set
 */
public void setId(long id) {
    this.id = id;
}
/**
 * @return the firstname
 */
public String getFirstname() {
    return firstname;
}
/**
 * @param firstname the firstname to set
 */
public void setFirstname(String firstname) {
    this.firstname = firstname;
}
/**
 * @return the lastname
 */
public String getLastname() {
    return lastname;
}
/**
 * @param lastname the lastname to set
 */
public void setLastname(String lastname) {
    this.lastname = lastname;
}
/**
 * @return the email
 */
public String getEmail() {
    return email;
}
/**
 * @param email the email to set
 */
public void setEmail(String email) {
    this.email = email;
}
/**
 * @return the description
 */
public String getDescription() {
    return description;
}
/**
 * @param description the description to set
 */
public void setDescription(String description) {
    this.description = description;
}
/**
 * @return the address
 */
public Address getAddress() {
    return address;
}
/**
 * @param address the address to set
 */
public void setAddress(Address address) {
    this.address = address;
}
/**
 * @return the organization
 */
public Organization getOrganization() {
    return organization;
}
/**
 * @param org the organization to set
 */
public void setOrganization(Organization organization) {
    this.organization = organization;
}
@Override
public String toString() {
    return "{name : "+this.getFirstname()+" "+this.getLastname()+", email : "+this.getEmail()+", "+this.getAddress().toString()+", "+this.getOrganization().toString()+"}";
}
}

控制器方法是-

@RequestMapping(method=RequestMethod.POST)
@ResponseBody
public String addUser(@ModelAttribute Person person){
    System.out.println("In person");
    System.out.println(person.getFirstname()+" "+person.getLastname()+" "+person.getEmail());
    System.out.println(person.getAddress().toString());
    return "Welcome";
}

当我的代码运行时，我会得到firstname、lastname和email的值，而address作为对象会抛出null指针异常，并且不会被设置。

错误-

    SEVERE: Servlet.service() for servlet [spring] in context with path [/lab2] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
    java.lang.NullPointerException
at com.cmpe275.lab2.controller.PersonController.addUser(PersonController.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:174)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:421)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:409)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
    In person
    John Doe john.doe@anony.com

如何设置地址对象值。地址POJO看起来像-

   package com.cmpe275.lab2.model;
   import javax.persistence.Embeddable;
   @Embeddable
   public class Address {

private String street;
private String city;
private String state;
private String zip;
/**
 * @return the street
 */
public String getStreet() {
    return street;
}
/**
 * @param street the street to set
 */
public void setStreet(String street) {
    this.street = street;
}
/**
 * @return the city
 */
public String getCity() {
    return city;
}
/**
 * @param city the city to set
 */
public void setCity(String city) {
    this.city = city;
}
/**
 * @return the state
 */
public String getState() {
    return state;
}
/**
 * @param state the state to set
 */
public void setState(String state) {
    this.state = state;
}
/**
 * @return the zip
 */
public String getZip() {
    return zip;
}
/**
 * @param zip the zip to set
 */
public void setZip(String zip) {
    this.zip = zip;
}
@Override
public String toString() {
    return "address : "+this.getStreet()+","+this.getCity()+","+this.getState()+", "+this.getZip();

};
}

我读过各种各样的博客，但没有通用的解决方案。我不想创建自定义映射器。

我尝试了使用Person和Address的代码版本，并成功地序列化和反序列化了Person对象。因此问题不在于@JsonUnwrapped以及特定类别Person和Address类别。我可以想到两个潜在的原因：

试图反序列化的JSON文档已损坏或与POJO结构不兼容
您正在使用的Jackson版本已经过时，并且与其他依赖项不兼容。我可以在你的代码中看到import org.codehaus.jackson.annotate.JsonUnwrapped;，那是Jackson的旧版本。尝试更新的版本（例如2.5.3）并执行import com.fasterxml.jackson.annotation.JsonUnwrapped;

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