I don't see anything wrong. This is from the JPA part of the EJB 3.0
spec:
-----------------------------------------------
4.6.10 Null Comparison Expressions
The syntax for the use of the comparison operator IS NULL in a
conditional expression is as follows:
{single_valued_path_expression | input_parameter } IS [NOT] NULL
A null comparison expression tests whether or not the single-valued
path expression or input parameter
is a NULL value.
-----------------------------------------------
single_valued_path_expression includes
single_valued_association_path_expression which is designated by the
name of an association-field in a one-to-one or
many-to-one relationship. The query seems to be fine. May be it's a
problem with the JPA implementation that you are using?
On Dec 23, 11:11 pm, Mike <gsun...@gmail.com> wrote:
> i tried, unfortunately it does not work, but, if i use the following query:
>
> select o from Person as o where o.address IS not NULL
>
> it work fine and just get all person that their address is not null. what's
> wrong with the original query?
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