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I'm trying to upgrade from Hibernate 3.6.5 to 4.0 (and from Spring 3.0.5 to 3.1 which is required for Hibernate 4 support). Now, with both MySQL and HSQL, I'm running into this problem with persistent boolean fields: Caused by: org.hibernate.HibernateException: Wrong column type in PUBLIC.PUBLIC.EVENT for column Checked. Found: bit, expected: boolean at org.hibernate.mapping.Table.validateColumns(Table.java:282) at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1268) at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:155) at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:453) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775) at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:184) at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:314) JPA @Entity and @Column annotations are used in domain objects, and the problematic fields look like this: @Column(name = "Checked") private boolean checked; HSQL schema: Checked bit default 0 not null, MySQL schema: `Checked` tinyint(1) NOT NULL default '0', What is the most straightforward way to solve this while sticking with Hibernate 4 ? Should I change the database schema, Hibernate configs, or domain class annotations? I have no idea if the code and configuration was fully "correct" before, but at least it worked fine with Hibernate 3.

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