Answer by Flavio Sadeghi

Flavio Sadeghi — Wed, 21 Dec 2016 15:49:08 -0500

[Edit]: The Bug 'Label Job has encountered a problem' is fixed with 6.5. We return null, since the below explanation is still true.

Lazy evaluation of entity beans is not supported with the ivy persistency.

As described in the documentation, ivy persistency always works with unmanaged entity beans. Lazy loading is only supported with managed entity beans. A beans is managed as long the referenced session (link to the db/transaction) is open - means the entity is managed (i.e. cached) in the session.

How to solve:

Example: Table Company has a 1:n relation to Invoices.

First question: is the lazy loading required? Do the Company entity need a list of all invoices or can it be replaced/reduced to the @ManyToOne relation on the Invoice entity?
To get the list of all invoices of a company a repositoy method has to be implemented, e.g. InvoiceRepository.readAllOfCompany(Company c) : List< Invoices >;
Write own repository method and open/close the session inside this method. As long the session is open, as long the entiries are managed and lazy loading is supported. Always ensure with a try-finally block that the session gets closed. Otherwise, the connection to the database remains open and the allowed number of connections is limited. An example could be find here.

Answers to: Eager Loading

Answer by Flavio Sadeghi