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I get the following error when using a primitive attribute in my grails domain object:
Null value was assigned to a property of primitive type setter of MyDomain.myAttribute org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of MyDomain.myAttribute at grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:1077) 
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A primitive is not an Object, therefore u can't assign null to it.
Java primitive types (such as int , double , or float ) cannot have null values, which you must consider in choosing your result expression and host expression types.
You could use a string instead of boolean and set it to "False", "True" or "" where the empty string represents your null value. Alternatively you need for every Boolean an extra Boolean like <attribute>IsSpecified which you set to false if the attribute value false means null.
According to this SO thread, the solution is to use the non-primitive wrapper types; e.g., Integer instead of int.
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