How to Resolve the MappingException: No Dialect Mapping for JDBC Type 2002 in Hibernate

What does the error "org.hibernate.MappingException: No Dialect mapping for JDBC type: 2002" mean in Hibernate?

The error 'org.hibernate.MappingException: No Dialect mapping for JDBC type: 2002' typically occurs when Hibernate encounters a JDBC type it cannot map to a corresponding SQL type in the defined dialect. This is often related to complex custom types, especially when interfacing with database-specific types that are not supported out of the box by Hibernate.

import org.hibernate.usertype.UserType;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Types;

public class CustomType implements UserType {
    public int[] sqlTypes() {
        return new int[]{Types.OTHER}; // Example for dealing with unsupported types
    }

    // Implement other methods required by UserType
}

Causes

• Using a database that contains custom or non-standard types that do not have a corresponding Hibernate dialect mapping.
• Not properly registering user-defined or complex types with Hibernate.

Solutions

• Define a custom user type in Hibernate and register it with the Hibernate configuration.
• Update the database schema to use standard SQL types that are recognized by Hibernate's default dialects.
• Check if your Hibernate version supports the JDBC type you're trying to use.

Mistake: Forgetting to define or register custom types with Hibernate.

Solution: Ensure that any custom types are defined using the UserType interface and properly registered in your Hibernate configuration.

Mistake: Using a database type that is not compatible with the current Hibernate dialect.

Solution: Review your dialect settings and ensure compatibility with the data types being utilized.