TryFind method in Guava throw NullPointerException

Question

I get a NullPointerException while running my webapplication, I save a logs and start server again and this error no longer there appeared, but i want protect method to NullPointer never appeared. I sure this line is responsible for this error

Vehicle pVehicle =
        Iterables.tryFind(aFactory.getVehicle(), new Predicate<Vehicle>() {
            @Override
            public boolean apply(Vehicle vehicle) {
                return vehicle.getVehicleBrand().equals(aVehicle.getVehicleBrand());
            }
        }).orNull();

But this is not my code, and i don't known, which part may cause this error> Please, which element can be appeared for this NullPointer and how protect this code

Possible duplicate of [What is a NullPointerException, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — xenteros, Oct 04 '16 at 11:29

score 2 · Accepted Answer · answered Oct 04 '16 at 11:29

2

Check the following statements:

aFactory - Because of the getVehicle() call.
aFactory.getVehicle() - Because Iterables.tryFind expects a non-null Iterable
vehicle - Because of the getVehicleBrand() call
aVehicle - Because of the getVehicleBrand() call
vehicle.getVehicleBrand() - Because of the .equals() call

If any of these were null it would cause an NullPointerException

answered Oct 04 '16 at 11:29

Kiskae

24,655
2
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It had to be getVehicleBrand() , and i protected this element – Monika Galińska Oct 04 '16 at 11:44

score 1 · Answer 2 · answered Oct 04 '16 at 11:27

1

can generate null pointer :

aFactory.getVehicle() : if aFactory is null
vehicle.getVehicleBrand() : if vehicle is null
aVehicle.getVehicleBrand() : if aVehicle is null

answered Oct 04 '16 at 11:27

BenB

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TryFind method in Guava throw NullPointerException

2 Answers2