spring-data-jpa--If you use One-to-many,many-to-one annotations, there is an incorrect solution for the JSON string at Jackson

Resources:

http://blog.csdn.net/remote_roamer/article/details/51330843

http://blog.csdn.net/xiaodaiye/article/details/51118870

In Spring-data-jpa, One-to-many and many-to-one annotations were used, and an error occurred while JSON was being serialized.

The following solutions have been found through the data access:

Annotate the associated fields by adding @jsonmanagedreference to the pojo of the main table:

@OneToMany (cascade = Cascadetype.refresh, mappedby= "RuleType", targetentity = Rule.  Class) @JsonManagedReferenceprivate Set rule;

Add @jsonbackreference to the Pojo of the child table to annotate the associated field

@ManyToOne (Cascade=cascadetype.refresh,fetch = fetchtype.eager) @JsonBackReference @JoinColumn (name= "TYPE") _id "private ruletype ruletype;

And then, using Jackson to generate the JSON,

New Objectmapper (). writevalueasstring (obj);

spring-data-jpa--If you use One-to-many,many-to-one annotations, there is an incorrect solution for the JSON string at Jackson