hibernate/hibernate-orm · error · UnsupportedOperationException

The Embeddable: %s parent initializer is neither an instance

Error message

The Embeddable: %s parent initializer is neither an instance of an EntityInitializer nor of a CollectionInitializer

What it means

After locating the owning initializer, EmbeddableInitializerImpl.determineParentInstance() can only produce a parent instance from an EntityInitializer (its target instance) or a CollectionInitializer (the collection's owner). If the parent initializer is neither of those kinds, it throws UnsupportedOperationException('The Embeddable: <navigablePath> parent initializer is neither an instance of an EntityInitializer nor of a CollectionInitializer'). It is the companion failure to 'Injection of parent instance into embeddable result is not possible': the embeddable's parent chain resolves to an initializer type that cannot supply an owning instance.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/sql/results/graph/embeddable/internal/EmbeddableInitializerImpl.java:580

		throw new UnsupportedOperationException( "Injection of parent instance into embeddable result is not possible" );
	}

	private Object determineParentInstance(Initializer<?> parentInitializer, RowProcessingState rowProcessingState) {
		if ( parentInitializer == null ) {
			throw new UnsupportedOperationException( "Cannot determine Embeddable: " + navigablePath + " parent instance, parent initializer is null" );
		}

		final var collectionInitializer = parentInitializer.asCollectionInitializer();
		if ( collectionInitializer != null ) {
			return collectionInitializer.getCollectionInstance( rowProcessingState ).getOwner();
		}

		final var parentEntityInitializer = parentInitializer.asEntityInitializer();
		if ( parentEntityInitializer != null ) {
			return parentEntityInitializer.getTargetInstance( rowProcessingState );
		}

		throw new UnsupportedOperationException( "The Embeddable: " + navigablePath + " parent initializer is neither an instance of an EntityInitializer nor of a CollectionInitializer" );
	}

	@Override
	public String toString() {
		return getClass().getSimpleName() + "(" + navigablePath + ") : "
			+ getInitializedPart().getJavaType().getJavaTypeClass().getSimpleName();
	}
}

View on GitHub (pinned to fad1729dce)

Solutions

1. Restructure the query so the embeddable is reached through its owning entity (fetch/select the owner and traverse from it).
2. Replace the embeddable projection with a scalar projection of its attributes or a DTO constructor expression.
3. If a custom Initializer/integrator is involved, review its position in the parent chain; an initializer that is neither entity nor collection cannot parent an embeddable.
4. Report or upgrade: this path indicates initializer wiring Hibernate does not handle - check the Hibernate JIRA for your version and test on the latest patch release.

Example fix

// before - embeddable reached through a chain Hibernate cannot parent
em.createQuery("select o.customer.contact.info from Order o", ContactInfo.class).getResultList();

// after - own the projection with a DTO
em.createQuery(
  "select new com.acme.ContactDto(i.email, i.phone) from Order o join o.customer.contact.info i",
  ContactDto.class).getResultList();

try {
    results = query.getResultList();
} catch (UnsupportedOperationException e) {
    if (String.valueOf(e.getMessage()).contains("neither an instance of an EntityInitializer")) {
        // fall back to selecting the owning entity and traversing in Java
    } else { throw e; }
}

When it happens

Trigger: An embeddable fetch whose resolved parent initializer is some other Initializer implementation - typically another embeddable/composite initializer that slipped through the determineOwningInitializer() walk, or an initializer contributed by custom user types, Hibernate Reactive, or third-party integrations that are not entity or collection initializers.

Common situations: Deeply nested embeddables used in unusual query positions; custom Initializer implementations registered via integrators; edge cases after a 6.x upgrade where initializer wiring changed; entity graphs or fetch profiles that restructure the initializer tree.

Related errors

• Injection of parent instance into embeddable result is not p
• Embeddable class not found: {}
• component: {} property not found: {}
• component type [{}] specifies {} properties for the instanti
• could not find property [{}] defined in the @Instantiator wi

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/797a123171e1cc75. Report an issue: GitHub.