Question

I am new to JPA and have some problems in understanding bidirectional relations.

I have the entities Job and Execution. 1 Job belongs to exactly 1 Execution and vice versa. So, I wanted to use the onetoone relation.

My code looks like following:

@Entity
public class Execution {
        ....
       @OneToOne(cascade=CascadeType.ALL,optional=false)
        private Job job;
        ....
}

@Entity
public class Job{
    ......
   @OneToOne(mappedBy="job",optional=false)
    private Execution execution;
    .....
 }

I set optional=false for both fields. As expected, hibernate throws an exception if I try to persist an Execution object which has a Null Job object.
But persisting a Job object with a Null Execution object is possible, although I set optional=false.

What am I doing wrong?

Answer 1

Try adding the following annotation.

@Column(nullable = false)