Jpa 简单类的简单CRUD的PersistenceException
使用内存数据库(db=mem),我只是尝试使用CRUD将一个新对象插入数据库 课程安排如下:Jpa 简单类的简单CRUD的PersistenceException,jpa,crud,playframework,Jpa,Crud,Playframework,使用内存数据库(db=mem),我只是尝试使用CRUD将一个新对象插入数据库 课程安排如下: @Entity public class ActivityModel extends Model { @Required public String description; @Required public String link; @Required public Date timestamp; public ActivityModel(
@Entity
public class ActivityModel extends Model {
@Required
public String description;
@Required
public String link;
@Required
public Date timestamp;
public ActivityModel(String description, String link, Date timestamp) {
this.description = description;
this.link = link;
this.timestamp = timestamp;
}
}
CRUD控制器如下所示:
@CRUD.For(ActivityModel.class)
public class Activities extends CRUD {
}
但是,当我尝试向数据库中添加新活动时,出现以下错误:
13:48:20,710 INFO ~ Application 'ScoreDB' is now started !
13:48:48,323 WARN ~ SQL Error: -177, SQLState: 23000
13:48:48,323 ERROR ~ Integrity constraint violation - no parent FKF0DCD93AADF686FF table: USERMODEL in statement [insert into ActivityModel (id, description, link, timestamp) values (null, ?, ?, ?)]
13:48:48,370 ERROR ~
@65pagp52g
Internal Server Error (500) for request POST /admin/activities
Execution exception (In {module:crud}/app/controllers/CRUD.java around line 135)
PersistenceException occured : org.hibernate.exception.ConstraintViolationException: could not insert: [models.users.hidden.ActivityModel]
play.exceptions.JavaExecutionException: org.hibernate.exception.ConstraintViolationException: could not insert: [models.users.hidden.ActivityModel]
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:290)
at Invocation.HTTP Request(Play!)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not insert: [models.users.hidden.ActivityModel]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1235)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1168)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1174)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:674)
at play.db.jpa.JPABase._save(JPABase.java:37)
at controllers.CRUD.create(CRUD.java:135)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:413)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:408)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:182)
... 1 more
... etc ...
我做错了什么显然,这是因为有一个不同的类包含以下代码:
@OneToMany(cascade = CascadeType.ALL, mappedBy="id")
public Collection<ActivityModel> activities;
@OneToMany(cascade=CascadeType.ALL,mappedBy=“id”)
公众募捐活动;
其中“mappedBy=“id”是问题的根源
删除此项后,一切正常:)显然,这是因为有一个不同的类包含以下代码:
@OneToMany(cascade = CascadeType.ALL, mappedBy="id")
public Collection<ActivityModel> activities;
@OneToMany(cascade=CascadeType.ALL,mappedBy=“id”)
公众募捐活动;
其中“mappedBy=“id”是问题的根源
删除此项后,一切正常:)错误与显示的代码不匹配。您确定这就是正在执行的类吗?错误与您显示的代码不匹配。你确定这就是正在执行的类吗?