java - Jackson 注释不与 Spring boot 一起使用

标签 java spring jackson spring-boot

我正在使用 Spring boot 1.0.1.RELEASE 并试图让它获取一些 Jackson 注释。更具体地说，我尝试使用 @JsonManagedReference 和 @JsonBackReference 注释。知道为什么这可能会被忽略吗？我也尝试了 @JsonIgnore 但似乎也没有被采纳。

我已经尝试过提到的两件事 in this SO question (将 Jackson 注释移至第一个并使用 List 而不是 Set)。我还看了this question on the Spring forums ，但这对我也没有帮助。

更新:

这是我的 ComponentType 类:

@Entity
public class ComponentType
{
// ------------------------------ FIELDS ------------------------------

    @Id
    @GeneratedValue()
    private long m_id;

    private String m_name;

    @JsonManagedReference
    @OneToMany(cascade = CascadeType.ALL)
    @JoinColumn(name = "parent_id")
    private List<ComponentSubtype> m_subtypes;

// --------------------------- CONSTRUCTORS ---------------------------

    public ComponentType()
    {
    }

    public ComponentType( String name, Iterable<ComponentSubtype> subtypes )
    {
        m_name = name;
        m_subtypes = Lists.newArrayList(subtypes);
    }

    // -------------------------- PUBLIC METHODS --------------------------

    public long getId()
    {
        return m_id;
    }

    public void setId( long id )
    {
        m_id = id;
    }

    public String getName()
    {
        return m_name;
    }

    public void setName( String name )
    {
        m_name = name;
    }

    public List<ComponentSubtype> getSubtypes()
    {
        return m_subtypes;
    }

    public void setSubtypes( List<ComponentSubtype> subtypes )
    {
        m_subtypes = subtypes;
    }

    public ComponentSubtype getSubtype( final long subtypeId )
    {
        return Iterables.find( getSubtypes(), new Predicate<ComponentSubtype>()
        {
            @Override
            public boolean apply( ComponentSubtype input )
            {
                return input.getId() == subtypeId;
            }
        } );
    }

这是ComponentSubtype:

@Entity
public class ComponentSubtype
{
    @Id
    @GeneratedValue()
    private long m_id;

    private String m_name;

    @JsonBackReference
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "parent_id",insertable=false,updatable=false)
    private ComponentType m_componentType;

    public ComponentSubtype()
    {
    }

    public ComponentSubtype( String name )
    {
        m_name = name;
    }

    public long getId()
    {
        return m_id;
    }

    public void setId( long id )
    {
        m_id = id;
    }

    public String getName()
    {
        return m_name;
    }

    public void setName( String name )
    {
        m_name = name;
    }

    public ComponentType getComponentType()
    {
        return m_componentType;
    }

    public void setComponentType( ComponentType componentType )
    {
        m_componentType = componentType;
    }
}

Controller :

@RestController
@RequestMapping("/api/components")
public class ComponentTypeController
{
    @Autowired
    private ComponentTypeRepository m_repository;

    @RequestMapping("/list")
    public Iterable<ComponentType> listComponents()
    {
        return m_repository.findAll();
    }
}

和存储库:

public interface ComponentTypeRepository extends CrudRepository<ComponentType, Long>
{
}

在我的主体中，我创建了一些用于测试的实体:

    ConfigurableApplicationContext context = SpringApplication.run( Main.class, args );
ComponentTypeRepository componentTypeRepository = context.getBean( ComponentTypeRepository.class );
componentTypeRepository.save( new ComponentType( "Component A", Sets.newHashSet( new ComponentSubtype( "Sub A - 1" ), new ComponentSubtype( "Sub A - 2" ) ) ) );
componentTypeRepository.save( new ComponentType( "Component B", Sets.newHashSet( new ComponentSubtype( "Sub B - 1" ), new ComponentSubtype( "Sub B - 2" ) ) ) );
componentTypeRepository.save( new ComponentType( "Component C", Sets.newHashSet( new ComponentSubtype( "Sub C - 1" ), new ComponentSubtype( "Sub C - 2" ) ) ) );
componentTypeRepository.save( new ComponentType( "Component D", Sets.newHashSet( new ComponentSubtype( "Sub D - 1" ),
                                                                                 new ComponentSubtype( "Sub D - 2" ),
                                                                                 new ComponentSubtype( "Sub D - 3" )
) ) );

如果我将浏览器指向http://localhost:8080/api/components/list，则会出现 stackoverflow 异常。

这是我得到的堆栈跟踪的一部分:

java.lang.StackOverflowError: null
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:660)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:541)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:644)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:117)
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)

演示该问题的示例项目:

从https://dl.dropboxusercontent.com/u/6373261/jackson-problem.zip下载

最佳答案

这是您的(老式的 IMO)字段命名约定(“m_*”)。 jackson 没有将它们与 getter 和 setter 联系起来。因此，您必须 @JsonIgnore getter 和 setter，或者更改命名，或者注释 getter。或者也许 @JsonBackReference(...) 中有一个功能？例如，@JsonBackReference("componentType") 可能会起作用。

关于java - Jackson 注释不与 Spring boot 一起使用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23055801/

上一篇：java - 使 JFrame 不重绘

下一篇：java - Web应用程序中的配置参数(Java+Spring+Hibernate+Tapestry)

相关文章：

java - 使用Java递归列出目录中的所有文件

java - 确保 Android 应用程序在单个进程中运行

java - Spring AOP 表达式中的多个返回类型

java - 来自InputStream的NoSuchMethodError : JsonFactory.

java - 垃圾收集正在减慢我的应用程序的运行速度？

java - 使用 TestNG DataProvider 跳过某些测试迭代

java - 无法使用 spring 和 hibernate 5.0 执行空间查询

java - 为基于 Spring 的 Web 应用程序中的每个请求分配一个唯一的 ID

java - jackson AfterburnerModule 在日志中发出警告

java - Jackson 映射器如何知道每个 Json 对象中的哪个字段分配给类对象？

©2024 IT工具网  联系我们