[OPENJPA-2894] All boolean expressions are not predicates

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.1.2, 3.2.0
• Component/s: criteria
• Assignee: Unassigned
• Reporter: Pawel Veselov
• Created: 13/Dec/21 15:02
• Updated: 13/Dec/21 15:25

Description

From PredicateImpl:

    public PredicateImpl add(Expression<Boolean> s) {
    	synchronized (_exps) {
        	_exps.add((Predicate)s); // all boolean expressions are Predicate
		}
        return this;
    }

However, a function that returns a boolean is an Expression<Boolean>, but is not a Predicate

Test case: https://github.com/veselov/Standalone-JPA-Test-Demo/tree/OPENJPA-2894 (run mvn package on JDK 1.8)