nullable « Property « JPA Q&A

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1. HQL nullable property should not be ignored, help?    stackoverflow.com

I have: 

Class Foo
{
String name;
String value;
Foo parent; //Foo.parent is OneToOne and nullable
}
I have the following HQL: 
FROM Foo f WHERE 
(lower(f.name) like concat( lower('string') , '%' )) or
(lower(f.value) like concat( lower('string') , '%' ...

2. Natural-id with nullable properties    forum.hibernate.org