Getting LazyInitializationException although using @Transactional(propagation=Propagation.REQUIRES_NEW)

Question

I use jHipster with Spring Data JPA and have the following method:

@Transactional(propagation=Propagation.REQUIRES_NEW)
public void doSomeWork(EntityA entityA) {
  // some code
  List<EntityB> entityBList = new ArrayList<EntityB>();
  entityBList.add(new EntityB());
  entityA.addAllEntityB(entityBList);
}

At the last line I get an org.hibernate.LazyInitializationException excption which I don't understand.

Why is it throwing this excption although the method is run in its own transaction?
Should it not just lazy load the list as the session is still open?

I use REQUIRE_NEW because this method is called from another class in a loop and i want after each iteration that the entities are getting persisted. In case one transaction fails in the loop, I want to have the previous iterations already persisted. — Thailer
– Thailer, Commented Sep 25, 2016 at 16:23

John Donn · Accepted Answer · 2016-09-25 22:29:06Z

1

It might be that LazyInitializationException is thrown because a new transaction is started and entityA becomes "detached" as the result.

One can use something like this:

@Transactional
public void addEntityB(long entityAId, entityB) {
  EntityA entityA = loadEntityA(entityAId);
  addEntityBToEntityA(entityA, entityB);
  saveEntity(entityB);
}

called from outside in this manner:

for (EntityB entityB : entityBList) {
  try {
    addEntityB(entityAId, entityB);
  }
  catch(Exception e){
    log(e);
  }
}

It is true that you load each time entityA, though.

edited Sep 25, 2016 at 22:29

answered Sep 25, 2016 at 18:29

John Donn

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1 Comment

Thailer Over a year ago

Thx a lot, you brought me to the right track. As EntityA is passed in to this transactional method, but fetched outside it gets detached. Hence fetching it first inside the transactional method solved the problem.

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