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Question

For a Hibernate table's column definition, if I don't specify not-null or @NotNull, what does the nullability default to?

Example:

<class name="Person" table="person">
    <id name="id" column="id" type="long"/>
    <property name="name" column="name" type="string"/>
</class>

Is name nullable?

Answer 1

In your case name is nullable.

Default behaviour is not nullable for primitive types ( int , double , etc) and nullable otherwise.