Question

I have a BOOLEAN type in a MySQL table (TINYINT(1)) and I’m trying to map the boolean field in an entity but this generates an exception:

org.hibernate.HibernateException: Wrong column type in maegul.users for column admin. Found: bit, expected: boolean

I changed the field in my entity to byte and make the respective changes so it acts a boolean, and I get:

org.hibernate.HibernateException: Wrong column type in maegul.users for column admin. Found: bit, expected: tinyint

I tried using the @Type annotation on the field:

@Type(type = "org.hibernate.type.NumericBooleanType")

but I get:

org.hibernate.HibernateException: Wrong column type in maegul.users for column admin. Found: bit, expected: integer

Answer 1

From what I read here :

org.hibernate.HibernateException: Wrong column type in maegul.users for column admin. Found: bit, expected: integer

It seems Hibernate is expecting an integer and got a bit.

Which mean your annotation is now correct :

@Type(type = "org.hibernate.type.NumericBooleanType")

But maybe it has updated your database to set as Bit instead of integer, thus the error.

If you really need a TinyInt, you can use @Type AND @Column, to set as Integer, of type TinyInt :

@Column(columnDefinition = "TINYINT")
@Type(type = "org.hibernate.type.NumericBooleanType")
public boolean admin = true;