Hibernate getReference(): When a SELECT is not needed at all

This article explores the classic N+1 query problem in Hibernate and methods for its optimization. The author notes that while JOIN FETCH and EntityGraph are standard tools for this task, developers often overlook the getReference() method (formerly load()). This method allows for obtaining an entity proxy object without executing a SELECT SQL query against the database, provided the object's identifier is already known. Using getReference() is effective in scenarios where it is necessary to establish relationships between entities or delete an object without loading its full data into memory. The article explains the mechanics of proxy objects, their performance benefits, and potential risks, such as LazyInitializationException. This material is useful for Java developers looking to optimize database interactions and reduce the load on the ORM layer in high-load applications.