Answer by Federico klez Culloca for Why BiPredicate evaluates the two boolean conditions prior to applying the test function

No, you're passing three arguments to result:

• The BiPredicate
• X
• Y

They get evaluated before calling result, which means the BiPredicate is evaluated and returns a BiPredicate (which is not executed), then X is evaluated, than Y but Y is obj.getSomeMethod() and obj is null, so the NullPointerException is thrown.