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- What is a NullPointerException, and how do I fix it?
What about on Android? On Android, tracking down the immediate cause of an NPE is a bit simpler The exception message will typically tell you the (compile time) type of the null reference you are using and the method you were attempting to call when the NPE was thrown This simplifies the process of pinpointing the immediate cause
- NullpointerException when stubbing Method - Stack Overflow
For me the reason I was getting NPE is that I was using Mockito any() when mocking primitives I found that by switching to using the correct variant from mockito gets rid of the errors
- Что такое Null Pointer Exception и как его исправить?
Что из себя представляет исключение Null Pointer Exception (java lang NullPointerException) и почему оно может происходить? Какие методы и средства использовать, чтобы определить причину возникнов
- When is it OK to catch NullPointerException? - Stack Overflow
Usually there is no such reason Usually it's good either to check if variable is null or catch NPE and trow more appropriate reason For example if a method getCar() returned null you may catch NPE on trying to call some method of the car, or check if the car is null and throw RuntimeException (but only if the situation is really exceptionable)
- NullPointerException in Java with no StackTrace - Stack Overflow
I've had instances of our Java code catch a NullPointerException, but when I try to log the StackTrace (which basically ends up calling Throwable printStackTrace() ), all I get is: java lang
- Is it okay to throw NullPointerException programmatically?
In the case of a null argument IllegalArgumentException might be the more appropriate exception to throw NullPointerException is meant to indicate that an attempt was made to perform some operation on a null value If an NPE is what you are aiming for, then just forgo null checking in your method, and the NPE will be thrown by the JVM naturally
- Why toString() on an Object instance (which is null) is not throwing NPE?
Just to be clear object toString() will guarantee an NPE if the object is null Try it out for yourself System out println() works on the object's reference to start with PrintWriter knows when a null reference is passed, so it will pass gracefully and print out null But if you try and call toString() from null it will surely throw NPE
- java - Why do I get a NullPointerException when comparing a String with . . .
You're calling a method on a variable containing null equals() isn't special, it will still throw a NPE
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