CODEWITHSUNDEEP
javaspringhibernatejpaspring-data-jpa
kk-dev11
kk-dev11

Reputation: 2674

Spring Data Repository: Detached entity passed to persist

A profile object has a list of tasks. When saving a new profile, the list of tasks should be also synchronized with Database (inserted or updated). The problem is the profile-repository's save()-method allows only the one or the other method depends on the cascade property set above the attribute (CascadeType.PERSIST or MERGE).

The Profile class

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class AbstractProfile implements Profile {
    ...

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST)
    private List<Task> tasks;

    ..

JUnit-Test class

public class ProfileTaskRepositoryTest {

    @Autowired 
    private ProfileRepository profileRepo;    //extends JpaRepository
    @Autowired
    private TaskRepository taskRepo;          //extends JpaRepository

    @Test // ->this test passes
    public void testCreateProfileWithNewTask() {

        //profileData and taskData hold dummy data. They return new objects
        AbstractProfile interview = profileData.createITInterviewProfile();
        Task questionTask = taskData.createInterviewQuestionTask();

        //add new task to profile and save
        interview.addTask(questionTask);
        profileRepo.save(interview);

        //task repository confirms the insertion
        assertTrue(taskRepo.count() == 1); 
    }

    @Test // ->this test fails
    public void testCreateProfileWithExistingTask() {

        //first create task and save in DB
        Task questionTask = taskData.createInterviewQuestionTask();  // transient obj
        taskRepo.save(questionTask);  // questionTask becomes detached

        // then create a new profile and add the existing task.
        // the problem is the existing task is now detached)
        AbstractProfile interview = profileData.createITInterviewProfile();
        interview.addTask(questionTask);

        profileRepo.save(interview); // !!! this throws an exception
    }

I suppose the questionTask-object becomes detached when taskRepo saves it in DB and then closes the session.

Exception:

org.springframework.orm.jpa.JpaSystemException: org.hibernate.PersistentObjectException: detached entity passed to persist: *.Task; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: *.Task
...

The profileRepo.save() should be able to handle both insertion and update of list of tasks. Is there a elegant way to solve this problem?

Upvotes: 4

Views: 5203

Answers (3)

yazabara
yazabara

Reputation: 1353

Hibernate session has expired;

Use

spring.datasource.removeAbandoned=false

or 

spring.datasource.removeAbandonedTimeout=...

Upvotes: 0

Nitin Arora
Nitin Arora

Reputation: 2668

You should put @Transactional attributes on the test class to avoid the exception. 

@Transactional
@TransactionConfiguration
public class ProfileTaskRepositoryTest {
}

Hope this helps.

Upvotes: 2

akcasoy
akcasoy

Reputation: 7215

try cascade = { CascadeType.PERSIST, CascadeType.MERGE }

Upvotes: 0

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