This is a major upgrade from version 4.3.2 to 6.2.0, spanning two major releases (5.x and 6.x). It introduces significant breaking changes requiring code and configuration updates.

Key Breaking Changes:

• Maven groupId Change: The Maven group ID has changed from org.hibernate to org.hibernate.validator. You must update your build configuration (e.g., pom.xml or build.gradle) to use the new coordinates.

• Java & Specification Upgrades:

  • Java Version: The minimum required Java version is now Java 8.
  • Bean Validation 2.0: The library now implements the Bean Validation 2.0 specification, which was introduced in version 6.0. This replaces the older Bean Validation 1.0/1.1 APIs from the 4.x/5.x series.
  • Method Validation: The custom method validation API from version 4 (org.hibernate.validator.method.*) has been removed and was replaced by the standard API in javax.validation.Validator since version 5.0.

• API and Constraint Removals:

  • The deprecated @SafeHtml constraint has been removed in version 6.2.
  • Many other APIs deprecated in version 4.3 were removed in 5.0.

• Dependency Changes:

  • An Expression Language (EL) 3.0 implementation is now required on the classpath.

• Behavioral Changes:

  • For security reasons, Expression Language evaluation is now disabled by default for custom violation messages created via ConstraintValidatorContext.

Recommendation:
This upgrade requires careful planning. Developers must:

1. Update the Maven groupId in the project's build files.
2. Ensure the project is running on Java 8 or newer.
3. Review all validation-related code to ensure compatibility with the Bean Validation 2.0 API and replace any removed APIs.
4. Add an Expression Language 3.0 implementation dependency if not already present.
5. Verify if custom violation messages rely on Expression Language and enable it explicitly where needed.

Source: Hibernate Validator Migration Guide, Release Announcements

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