How to create bogus Predicate in JPA

Question

Is there any way to create bogus Predicate in JPA? Sort of like this:

CriteriaBuilder cb = em.getCriteriaBuilder;
Predicate pred = cb.isTrue(false);

Almost all the methods of CriteriaBuilder take Expression as parameter. I also tried this to no avail:

Expression<Object> path = cb.coalesce.value(null);
Predicate pred = cb.isNotNull(path);

Obviously it throws NPE, however I thought that this might work, because according to API documentation:

A coalesce expression is equivalent to a case expression that returns null if all its arguments evaluate to null, and the value of its first non-null argument otherwise.

Answer 1

dijunction did not work for me in more complicated query in Eclipselink 2.4.

What did was cb.isTrue(cb.literal(false)) which is as precise representation of false as one can get.

Answer 2

I think a disjunction is what you're looking for. It's false by default, until some real predicate is ored to it.