hibernate/hibernate-orm · error · IllegalArgumentException

`%s` cannot be treated as `%s`

Error message

`%s` cannot be treated as `%s`

What it means

Error "`%s` cannot be treated as `%s`" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/metamodel/mapping/ValueMapping.java:46

	}

	/**
	 * Treat operation.  Asks the ValueMapping to treat itself as the
	 * given `targetType`, if it can.
	 *
	 * @apiNote This is not necessarily limited to things the ValueMapping
	 * itself implements.
	 *
	 * @implNote This default implementation is however limited to just
	 * things the ValueMapping itself implements.
	 *
	 */
	default <X> X treatAs(Class<X> targetType) {
		if ( targetType.isInstance( this ) ) {
			return targetType.cast( this );
		}

		throw new IllegalArgumentException(
				String.format(
						Locale.ROOT,
						"`%s` cannot be treated as `%s`",
						getClass().getName(),
						targetType.getName()
				)
		);
	}
}

View on GitHub (pinned to fad1729dce)

Solutions

1. Use treat() only with a subtype of the path's declared type.
2. Check the inheritance hierarchy: the treat target must be related to the declared type of the expression.

When it happens

Trigger: Thrown when a TREAT expression targets a type that the value mapping cannot be narrowed to.

Common situations: See trigger scenarios.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/e3febb66bffe57c3. Report an issue: GitHub.