How to Fix the Hibernate Error: 'Object References an Unsaved Transient Instance'?

Fixing the Hibernate Error: "Object References an Unsaved Transient Instance - Save the Transient Instance Before Flushing"

Many users may encounter an error while attempting to persist an object using Hibernate. The error typically manifests itself as:

object references an unsaved transient instance - save the transient instance before flushing

This issue arises when a collection within the entity being saved contains items not present in the database. To resolve it, you must specify cascade="all" in the XML mapping or cascade=CascadeType.ALL in the annotations for the collection.

This modification instructs Hibernate to save collection items concurrently with their parent. By omitting this instruction, unsaved collection items remain transient, leading to the error message.

By implementing this solution, you can ensure the integrity of your persisted data and eliminate the "Object References an Unsaved Transient Instance" error.

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