The JPA spec supports primitive types as @Columns. What they don't say (assuming Hibernate is the implementation (maybe TopLink does that too)) is that this column becomes nullable = false and the default value is the default for the primitive type. And that is so, even though the @Column(nullable by default is true.
So
@Entity
public class Person {
private int age;
private boolean male;
public class Person {
private int age;
private boolean male;
actually means
@Entity
public class Person {
@Column( nullable = false )
private int age = 0;
@Column( nullable = false )
private boolean male = false;
public class Person {
@Column( nullable = false )
private int age = 0;
@Column( nullable = false )
private boolean male = false;
So watch out.
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