Question

我正在尝试显示JSON数据，因为我使用的是fastxml jackson。我能够显示JSON，但JSON正在进入无限循环，在日志文件中我得到错误

ERROR [org.apache.catalina.core.ContainerBase [jboss.web] [缺省主机]。[/ EAD]。[弹簧]] （http - 127.0.0.1-8080-1）用于servlet spring的Servlet.service（）抛出 exception：java.lang.ClassNotFoundException： com.fasterxml.jackson.databind.JsonMappingException $ Reference from [模块“deployment.EAD.war：main”来自服务模块加载器]

这是我的控制器方法。

@RequestMapping("/viewDashboard")
@ResponseBody
public ModelMap test(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, @RequestParam String name) {

    ModelMap modelMap = new ModelMap();
    List<Instances> instances = viewDashboardServiceImpl.viewDashboard();
    return modelMap.addAllAttributes(instances);

}

实际上我的Instance.java与Application.java和Environment.java有关系

以下是我的model.java

这是我的instance.java

@Id
@GeneratedValue
@Column(name = "instanceId")
private long id;

@Column(name = "name")
private String instanceName;

@ManyToOne
@JoinColumn(name = "appId")
private Applications applications;

@ManyToOne
@JoinColumn(name = "enviId")
private Environments environments;

@Column(name = "version")
private String version;

这是我的Application.java

    @Id
@GeneratedValue
@Column(name = "appId")
private long id;

@Column(name = "name")
private String name;

@Column(name = "ownerName")
private String ownerName;

@Column(name = "version")
private String version;

@OneToMany(mappedBy = "applications", targetEntity = Instances.class)
private Set<Instances> instances;

这是我的Environment.java

@Id
@GeneratedValue
@Column(name = "enviId")
private long id;

@Column(name = "name")
private String name;

@Column(name = "ownerName")
private String ownerName;

@Column(name = "version")
private String version;

@OneToMany(mappedBy = "environments", targetEntity = Instances.class)
private Set<Instances> instances;

这是我的JSON

{"instances":{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":{"id":1,"name":"SAP","ownerName":"Mou","version":"3.2.1abc","instances":[{"id":2,"instanceName":"SAP BW DEV1","applications":

如上所述JSON继续重复数据。我在maven中也有以下依赖。

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.5</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.4.5</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.4.5</version>
    </dependency>

我还在servlet.xml中添加了以下代码段。

    <bean id="contentNegotiationManager"
    class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
    <property name="favorPathExtension" value="false" />
    <property name="favorParameter" value="true" />
    <property name="mediaTypes">
        <value>
            json=application/json
            xml=application/xml
        </value>
    </property>
</bean>

错误 - JSON进入无限循环

0 个答案: