Hibernate + Derby: Comparisons between 'BOOLEAN' and 'INTEGER' are not supported

Question

I have a problem with querying Derby database. I am using Hibernate with JPA. Problem is related (probably) to boolean columns. Each query ends with error:

org.h

Answer 1

Downgrade didn't helped. Here is valid solution which works for me:

import java.sql.Types;
import org.hibernate.dialect.DerbyTenSevenDialect;

public class DerbyDialect extends DerbyTenSevenDialect {

    public DerbyDialect() {
        // fix Derby dialect boolean data type mapping error
        registerColumnType(Types.BOOLEAN, "INTEGER");
    }
}

I guess it is better to configure 'true' and 'false' constants mapping in dialect to Derby data type, but above is good enough for now.