How do you Handle Hibernate Proxy Objects When Communicating with GWT Clients via RPC?

Overcoming Hibernate Proxy Objects in GWT RPC

In Hibernate, lazy loading is a convenient feature that optimizes database queries by only fetching data when necessary. However, this can pose challenges when trying to serialize entities that are loaded as proxies for GWT RPC communication. This article addresses this issue and provides a solution to convert Hibernate proxies into real entity objects.

The Problem: Proxy Objects in GWT RPC

When some entities are loaded lazily as proxies during a Hibernate session, they cannot be directly sent to a GWT client via RPC. This is because RPC requires real entity objects to be serialized. The challenge lies in converting these proxies into real objects without disabling lazy loading, which would defeat its performance benefits.

The Solution: Initializing and Unproxying

To convert a Hibernate proxy into a real entity object, we can use a utility method that performs the following steps:

1. Initialization: Calls Hibernate.initialize(entity) to ensure that the proxy is initialized. This forces Hibernate to fetch all of the entity's data from the database.
2. Unproxying: If the entity is still a Hibernate proxy after initialization, the method retrieves the actual implementation of the entity by calling ((HibernateProxy) entity).getHibernateLazyInitializer().getImplementation().

This method provides a convenient and efficient way to convert Hibernate proxies into real entity objects, allowing for seamless integration with GWT RPC.

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