hibernate/hibernate-orm · error · UnknownUnwrapTypeException

Cannot unwrap to requested type [{}]

Error message

Cannot unwrap to requested type [{}]

What it means

Error "Cannot unwrap to requested type [{}]" thrown in hibernate/hibernate-orm.

Source

Thrown at hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/spi/AbstractDataSourceBasedMultiTenantConnectionProviderImpl.java:64

		return true;
	}

	@Override
	public boolean isUnwrappableAs(@Nonnull Class<?> unwrapType) {
		return unwrapType.isInstance( this )
			|| unwrapType.isAssignableFrom( DataSource.class );
	}

	@Override
	public <X> X unwrap(@Nonnull Class<X> unwrapType) {
		if ( unwrapType.isInstance( this ) ) {
			return unwrapType.cast( this );
		}
		else if ( unwrapType.isAssignableFrom( DataSource.class ) ) {
			return unwrapType.cast( selectAnyDataSource() );
		}
		else {
			throw new UnknownUnwrapTypeException( unwrapType );
		}
	}
}

View on GitHub (pinned to fad1729dce)

Solutions

1. Only unwrap to types implemented by the abstract multi-tenant provider
2. Avoid unwrap() to unrelated types

When it happens

Trigger: Thrown at hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/spi/AbstractDataSourceBasedMultiTenantConnectionProviderImpl.java:64 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22). Data as JSON: /api/errors/20cdc3f2e8174c50. Report an issue: GitHub.