Hibernate and Jackson

When there is a one-to-many, multi-class relationship, use Hibernate to query and turn Jackson into JSON

For example, persistent class user

public class User implements java.io.serializable{private string ID;    Private set<usertorole> Usertoroles=new hashset<usertorole> (0); Getter Setter ...}

Its hibernate configuration file User.hbm.xml

<id name= "id" type= "java.lang.String" > <column name= "id" length= "ten"/> <generator class= "Assigned" ; </generator></id><set name= "Usertoroles" table= "Usertorole" inverse= "true" lazy= "false" Fetch= " Select "> <key> <column name=" ID "/> </key> <one-to-many class=" Com.xxx.entity.Usert Orole "/></set>

and Persistence class Usertorole

public class Usertorole implements java.io.serializable{private string ID;    private user user; Getter Setter ...}

By User.hbm.xml, the user class is associated with a one-to-many and Usertorole class, and in order to fetch the value of the Usertorole collection, it also sets the

Lazy= "false"

Run times wrong, dead loop, wait a long time before overflow stop.

Then Jackson's annotations are about to work.

Add annotations above the user property of the Usertorole class @jsonbackreference

That

public class Usertorole implements java.io.serializable{private string ID;    @JsonBackReference Private User User; Getter Setter ...}

It's OK to run again. This is to prevent this infinite loop.

This article is from the "under the Tree Beast" blog, please make sure to keep this source http://shuxiayeshou.blog.51cto.com/4452347/1866766

Hibernate and Jackson