hibernate/hibernate-orm · error · IllegalArgumentException

Unsupported generation type:${generationType}

Error message

Unsupported generation type:${generationType}

What it means

Error "Unsupported generation type:${generationType}" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/boot/model/internal/GeneratorStrategies.java:66

			case TABLE:
				return org.hibernate.id.enhanced.TableGenerator.class.getName();
			case UUID:
				return UUIDGenerator.class.getName();
			case AUTO:
				if ( UUID.class.isAssignableFrom( type.determineRawClass().toJavaClass() ) ) {
					return UUIDGenerator.class.getName();
				}
				else if ( "increment".equalsIgnoreCase( name ) ) {
					// special case for @GeneratedValue(name="increment")
					// for some reason we consider there to be an implicit
					// generator named 'increment' (doesn't seem very useful)
					return IncrementGenerator.class.getName();
				}
				else {
					return SequenceStyleGenerator.class.getName();
				}
			default:
				throw new IllegalArgumentException( "Unsupported generation type:" + generationType );
		}
	}

	/**
	 * Interpret an "old" generator strategy name as a {@link Generator} class.
	 */
	public static Class<? extends Generator> generatorClass(String strategy, SimpleValue idValue) {
		if ( "native".equals(strategy) ) {
			strategy =
					idValue.getMetadata().getDatabase().getDialect()
							.getNativeIdentifierGeneratorStrategy();
		}
		switch (strategy) {
			case "assigned":
				return org.hibernate.id.Assigned.class;
			case "enhanced-sequence":
			case "sequence":
				return SequenceStyleGenerator.class;

View on GitHub (pinned to fad1729dce)

Solutions

1. Use a supported GenerationType (AUTO, IDENTITY, SEQUENCE, TABLE, UUID).

When it happens

Trigger: An identifier/value generator declaration is inconsistent with the referenced generator or the annotated element.

Common situations: @GeneratedValue pointing at a generator of the wrong kind (SEQUENCE vs TABLE), a missing named generator, too many generator annotations, or an unsupported generation strategy for @CollectionId.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/5f79f8b94677a542. Report an issue: GitHub.