在Java中的Json序列化期间如何避免无限循环 [英] How avoid infinite loop during Json Serialization in Java

问题描述

使用hibernate检索兄弟列表

  public class Brother {
 public int brotherId; 
公共字符串名称; 
 
公开列表< Brother>兄弟; 
 $ b $ public Brother（）
 {
 brothers = new ArrayList< Brother>（）; 
} 
 
 // Getter Setter 
} 
  

Hibernate在兄弟列表中使用lazy select进行配置，这在Java方面是有效的，
但是问题出在我想将Brother对象序列化为JSON时。

 我得到了org.codehaus.jackson.map.JsonMappingException：无限递归（StackOverflowError）
  

例如，布赖恩可以让马克作为兄弟的反证...

我该如何解决它？是否有任何方法可以指示maxson库的递归最大数量？

我的代码很简单。

 兄弟= this.myservice.getBrother（4）; 
 ObjectMapper mapper = new ObjectMapper（）; 
 System.out.println（mapper.writeValueAsString（brother））; 
  

解决方案

/ strong>。
$ b

由于 Jackson 1.6 ，您可以使用两个注释来解决无限
递归问题，而不会在
序列化过程中忽略getters / setters： @JsonManagedReference 和 @JsonBackReference 。
blockquote>

请参阅此处了解更多

I retrieve a list of Brothers using hibernate

public class Brother {
    public int brotherId;
    public string name;

    public List<Brother> brothers;

    public Brother()
    {
        brothers = new ArrayList<Brother>();
    }

    //Getter Setter
} 

Hibernate is configured using lazy select in brothers list, this in Java side works, But the problem is when I want to serialize a Brother object to JSON.

I've got org.codehaus.jackson.map.JsonMappingException: Infinite recursion (StackOverflowError)

for Example Bryan can have Mark as brother an viceversa...

How I can solve it? is there any way to indicate max number of recursion to jackson libraries?

my code, it is really simple.

Brother brother = this.myservice.getBrother(4);
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writeValueAsString(brother));

解决方案

Issue is arising because of Circular Reference.

Since Jackson 1.6 you can use two annotations to solve the infinite recursion problem without ignoring the getters/setters during serialization: @JsonManagedReference and @JsonBackReference.

refer here for more

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