hibernate/hibernate-orm · error · HibernateException

Unable to locate TypeSafeActivator#activate method

Error message

Unable to locate TypeSafeActivator#activate method

What it means

The Bean Validation API was detected as available and TypeSafeActivator loaded, but the reflective lookup of activate(ActivationContext) threw NoSuchMethodException: the activator class on the classpath does not match the shape the driving BeanValidationIntegrator expects — the signature of a different Hibernate version.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/boot/beanvalidation/BeanValidationIntegrator.java:118

		if ( modes.size() > 1 ) {
			BEAN_VALIDATION_LOGGER.multipleValidationModes( ValidationMode.loggable( modes ) );
		}
		activate( metadata, sessionFactory, serviceRegistry, modes, constraintInfluence );
	}

	private void activate(Metadata metadata, SessionFactoryImplementor sessionFactory, ServiceRegistryImplementor serviceRegistry, Set<ValidationMode> modes, ValidationConstraintDdlInfluence constraintInfluence) {
		final var classLoaderService = serviceRegistry.requireService( ClassLoaderService.class );
		// see if the Bean Validation API is available on the classpath
		if ( isBeanValidationApiAvailable( classLoaderService ) ) {
			// and if so, call out to the TypeSafeActivator
			try {
				final var activationContext =
						new ActivationContextImpl( modes, constraintInfluence, metadata, sessionFactory,
								(SessionFactoryServiceRegistry) serviceRegistry );
				callActivateMethod( classLoaderService, activationContext );
			}
			catch (NoSuchMethodException e) {
				throw new HibernateException( "Unable to locate TypeSafeActivator#activate method", e );
			}
		}
		else {
			// otherwise check the validation modes
			// todo : in many ways this duplicates the checks done on the TypeSafeActivator when a ValidatorFactory could not be obtained
			validateMissingBeanValidationApi( modes, constraintInfluence );
		}
	}

	private void callActivateMethod(ClassLoaderService classLoaderService, ActivationContext activationContext)
			throws NoSuchMethodException {
		final var activateMethod =
				loadTypeSafeActivatorClass( classLoaderService )
						.getMethod( ACTIVATE_METHOD_NAME, ActivationContext.class );
		try {
			activateMethod.invoke( null, activationContext );
		}
		catch (InvocationTargetException e) {

View on GitHub (pinned to fad1729dce)

Solutions

1. Deduplicate hibernate-core: dependency:tree / gradle dependencies, then enforce a single version
2. If shading, rebuild the shaded artifact against the current Hibernate version
3. On platforms like WildFly/Quarkus, use the Hibernate provided by the platform and remove explicit hibernate-core dependencies

// same dedupe guard that prevents the method-lookup variant
static void assertSingleHibernateCore() throws IOException {
    Enumeration<URL> urls = Thread.currentThread().getContextClassLoader().getResources(
        "org/hibernate/boot/beanvalidation/BeanValidationIntegrator.class");
    if (Collections.list(urls).size() > 1)
        throw new IllegalStateException("Multiple hibernate-core copies; align versions");
}

try {
    sessionFactory = new Configuration().buildSessionFactory();
} catch (HibernateException e) {
    if (e.getCause() instanceof NoSuchMethodException)
        throw new IllegalStateException("hibernate-core version mix-up: duplicate artifacts present", e);
    throw e;
}

When it happens

Trigger: SessionFactory bootstrap with validation active (CALLBACK/AUTO) while mismatched hibernate-core artifacts coexist, so the loaded TypeSafeActivator lacks the activate(ActivationContext) method the integrator is calling.

Common situations: Version drift after upgrading hibernate-core but leaving a stale or shaded copy behind; frameworks pulling hibernate-core transitively at a different version than the one on the classpath.

Related errors

• Unable to check validity of passed ValidatorFactory
• Could not locate method needed for ValidatorFactory validati
• Multiple active MetadataBuilder definitions were discovered
• Validation failed for classes {} during {} time for groups [
• Error activating Bean Validation integration

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/303423839a74423a. Report an issue: GitHub.