hibernate/hibernate-orm · error · InstantiationException

Could not instantiate type

Error message

Could not instantiate type

What it means

Error "Could not instantiate type" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/boot/internal/TypeBeanInstanceProducer.java:42

public class TypeBeanInstanceProducer implements BeanInstanceProducer, TypeBootstrapContext {
	private final ConfigurationService configurationService;
	private final ServiceRegistry serviceRegistry;

	public TypeBeanInstanceProducer(ConfigurationService configurationService, ServiceRegistry serviceRegistry) {
		this.configurationService = configurationService;
		this.serviceRegistry = serviceRegistry;
	}

	@Override
	public <B> B produceBeanInstance(Class<B> beanType) {
		final var bootstrapContextAwareConstructor =
				getConstructorOrNull( beanType, TypeBootstrapContext.class );
		if ( bootstrapContextAwareConstructor != null ) {
			try {
				return bootstrapContextAwareConstructor.newInstance( this );
			}
			catch ( Exception e ) {
				throw new InstantiationException( "Could not instantiate type", beanType, e );
			}
		}
		else {
			final var constructor = getConstructorOrNull( beanType );
			if ( constructor != null ) {
				try {
					return constructor.newInstance();
				}
				catch ( Exception e ) {
					throw new InstantiationException( "Could not instantiate type", beanType, e );
				}
			}
			else {
				throw new InstantiationException( "No appropriate constructor for type", beanType );
			}
		}
	}

View on GitHub (pinned to fad1729dce)

Solutions

1. Check the causal exception: the type class failed to instantiate, typically due to a missing no-arg constructor or a constructor throwing.
2. Ensure the custom type class is public, non-abstract, and has an accessible constructor.
3. Verify the correct class name is registered for the TypeDefinition.

When it happens

Trigger: CDI-style bean creation of a custom Hibernate type fails.

Common situations: A custom UserType/AttributeConverter bean that cannot be instantiated, lacking an injectable or no-arg constructor.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/b5b69042ac6f17f0. Report an issue: GitHub.