Filling in the docs example for isNil:
// previous example tested if approved equals "null"
filter = ff.isNull(ff.property("approved"));
// this example checks if approved exists at all
filter = ff.isNil(ff.property("approved"),"no approval available");
The second parameter; nilReason - I don't think it can be supplied as part of
the query? Instead I think it is supplied by the backing datastore? Perhaps it
was unable to find a suitable join target ...
Basically I viewed this as a second return value for the expression.
--
Jody Garnett
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