This is a major version upgrade from 4.x to 5.x, which introduces significant breaking changes. The hibernate-entitymanager artifact is no longer published as its functionality has been merged into hibernate-core as of version 5.2. [2, 18]

Highlights:

• Artifact Merge: You must remove the org.hibernate:hibernate-entitymanager dependency and rely solely on org.hibernate:hibernate-core. [2]
• Query Parameters: Support for JDBC-style ? positional parameters in HQL/JPQL queries is removed in version 5.3. Queries must be updated to use named parameters (e.g., :paramName). [14, 12]
• Java Baseline: Hibernate 5.2+ requires Java 8 as a minimum. [2, 17]

Source: Hibernate Migration Guides
Recommendation: This upgrade requires careful dependency management changes and potential query refactoring. Developers must validate all HQL/JPQL queries and update build files before merging.

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