I'm using blobs to persist different kind of images to database. Due to cache limitations the entity holding the blob property is modeled as a parent/child where the parent has a set of entities holding the actual blob property. The problem is that i want to cascade "save-update" from the parent when the parent is created or updated (and I want the blob entity to be updated on "both sides" in second level cache). The parent is loaded in a detatched state (web client) and has the blob entity is pre-loaded. When send the parent to the service layer (remote ejb3) i get "Blobs may not be accessed after serialization" because the blob entity was loaded in a detatched state before starting the service layer transaction.

What is the best way to solve this? What should I do differently?