NotNull

The NotNull annotation is used to indicate that an entity class's field may not contain a null value when being persisted to the database. NotNull has no effect on a field that is marked transient.

NotNull` Example

The example below shows how the field mBar is marked as not nullable.

public class Foo {

    @NotNull
    private String mBar;

    public String getBar() {
        return mBar;
    }

    public void setBar(String bar) {
        mBar = bar;
    }

}