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What is a NullPointerException? - Stack Overflow This particular NPE can be avoided if the comparison order is reversed; namely, use equals on a guaranteed non-null object All elements inside of an array are initialized to their common initial value ; for any type of object array, that means that all elements are null
NPE error when assigning variables (program does not crash, only debug . . . You should have a stacktrace if this is a NPE as you state The reason for the program not crashing is you may be handling and "swallowing" your exceptions Consider removing catch blocks or re-throwing a RuntimeException wrapping the root cause to make you application crash - then address the cause of the crash!
NullpointerException when stubbing Method - Stack Overflow If you're using Scala and you try to create an any matcher on a value class, you'll get an unhelpful NPE So given case class ValueClass(value: Int) extends AnyVal , what you want to do is ValueClass(anyInt) instead of any[ValueClass]
nullpointerexception - Java - best way to detect NPE at compile time . . . I used to use lots of @NotNull @Nullable annotations to enable IDE to help me find out potential NPE at compile time However, my new team doesn't allow any use of @NotNull @Nullable annotations, and nor are custom annotations like those allowed As a result, I become much more likely to write bugs caused by NPE than before
Is it possible to track down which expression caused an NPE? $ java -agentpath:libRichNPE o TestNPE about to throw NPE Exception in thread "main" java lang NullPointerException: location=17 at TestNPE main(TestNPE java:7) So that points to the invokevirtual #5 at offset 17!
Java 8 stream - how to properly make NPE-safe stream Here are some restrictions: 1) errorList - cannot be null here so a call to stream() is safe - when it's empty it will just return false 2) getErrorSegment() and getErrorDetails() can both be nulls tha's why I'm using filter like that to make sure none of them is null 3) getErrorCode() can be null but it will never throw NPE because it will
NullPointerException | `this` inside enum constructor causing NPE Exactly Just as @PeterS mentioned using enum before it has been properly constructed is causing NPE, because values() method is being called on un-constructed enum One more point, I would like to add here that Platform1 and Platform2 both are trying to use unconstructed enum in switch() but NPE is only in Platform1 Reason behind this is as
When is it OK to catch NullPointerException? - Stack Overflow 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) Thus you make errors more
NPE when calling a mocked object (Mockito) - Stack Overflow The second row of myMethod(String someId, SomeHeaderParams someHeaderParams) in MyController class: There is an invocation of the method myClientService getHeaderParams(SomeHeaderParams): I don't see any mock configuration for that invocation, so it should return null, and when the buildRequest(String, Map, Map) method is called, it should recive a null as second argument