Hibernate : collection cache not evicted

Question

I'm experiencing an issue with Hibernate collections caching (by EHCache).

So, this is the entity that owns the collection :

@Entity(name = "Message")
@Table(name = "t_message")
public class Message implements Comparable<Message>{
    @Id
    @Column(name = "message_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.EAGER, mappedBy = "message")
    @Sort(type = SortType.NATURAL)
    @JsonIgnore
    @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
    private SortedSet<Event> events = new TreeSet<>();

    // ...
}

Then, in the other entity, there is a symetrical to the Message :

@Entity(name = "Event")
@Table(name = "t_event")
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
public class Event implements Comparable<Event>, Comparator<Event> {
    @Id
    @Column(name = "event_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "event_message_id", referencedColumnName = "message_id")
    @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
    private Message message;

    // ...
}

The problem : when I add an Event, the "events" field, the cache is not evicted. If I remove the @Cache anotation below this field, it works but of course with no cache.

I believed this has to be linked with the fact that when inserting a new event (by entity manipulations), we link it to a message from the event side so I added this line on hibernate configuration file :

<property name="hibernate.cache.auto_evict_collection_cache">true</property>

But it didn't solve the problem.

Additional informations :

Other ManyToOne collections caching works perfectly on the project.
There is no native queries in the project, only HQL and entities manipulations.
I'm using Hibernate 4.3.2 and EHCache 2.10.4.

Thanks for your advices.

Romain Ciaccafava Romain Ciaccafava · Accepted Answer · 2017-12-05T09:57:09

Ok, just figured out that a "cascade" parameter was missing in the Message's events field @OneToMany annotation :

@ManyToOne(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY)
@JoinColumn(name = "event_message_id", referencedColumnName = "message_id")
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
private Message message;

Solved !

Hibernate : collection cache not evicted

1 Answers