I have a problem with "cannot access loading collection" errors in the following scenario:

Thread 1


Thread 2


At the last line I sometimes get a LazyInitializationException with the message "cannot access loading collection".

The funny thing is that this code is executed about 100.000 times a day and it usually always works. Just about once a day I get this error.

Any ideas?

Hibernate version: 2.1.6

Mapping documents:


stack trace of any exception that occurs:
net.sf.hibernate.LazyInitializationException: cannot access loading collection
at net.sf.hibernate.collection.PersistentCollection.initialize(PersistentCollection.java:191)
at net.sf.hibernate.collection.PersistentCollection.read(PersistentCollection.java:71)
at net.sf.hibernate.collection.Set.iterator(Set.java:130)
[...]

Name and version of the database you are using: MySQL 4.1.14

Does the token class have any lazily-loaded associations? Hibernate.initialize only forces loading of the objects in the collection, not objects in those objects. If there is a piece of code that is only rarely run but uses a non-initialized association, that would explain what you are seeing.

The Token class does not have any collections. The only noteworthy thing it has is maybe the inverse relationship back to Person.

A quick check for the error: "cannot access loading collection" in the source (2.7) shows that the code that throws it is:



So Hibernate thinks the collection is "!initialized" but is "initializing."

Have you tried getting the tokens themselves in thread 1 and passing the collection to thread 2?

Do you have any error handling code that might allow the initialize() call to bomb out, leaving the collection half-initialized, and then proceed to thread 2?