CODEWITHSUNDEEP
javahibernatelocking
Quincy
Quincy

Reputation: 4433

Locking a collection in Hibernate

I have got a session bean method that uses Hibernate to add child to a indexed collection of an entity. However, since there may be multiple threads accessing the method at the same time, in some weird cases it happened that a duplicate index will be assigned to different children (bug in Hibernate? I don't know).

To prevent it, I would like to try to lock the whole entity as well as it's collection so other threads would not be able to modify it while another thread is updating it. I know we can set lock mode to an entity, but how about a collection? Can it lock any other transactions from adding a new child?

Please enlighten me! Thanks in advance.

Upvotes: 0

Views: 511

Answers (1)

loodakrawa
loodakrawa

Reputation: 1574

Maybe you could try to use synchronized collection wrappers. You can use the static methods in Collections class (Collections). For example:

List<String> myList = Collections.synchronizedList(new List<String>());

As for locking at entity level, a synchronized code block locked on the entity should do the trick.

 synchronized (entityInstance) 
 {
    ...
 }

Upvotes: 2

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