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.
Что такое Null Pointer Exception и как его исправить?
2016年4月8日 · 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...
Java 8 stream - how to properly make NPE-safe stream
2018年10月29日 · Last week got very strange NPE in a stream that caused my lots of troubles so right now I'm feeling like being over-safe with NPE when using a Stream. Here is my method right now: private boolean
NPE when calling a mocked object (Mockito) - Stack Overflow
2016年7月4日 · 1 Where are you getting the NPE? 2 I don't see anywhere in the code MockitoAnnotations.initMocks(this); to initialise your mocks; are you using a different runner such as MockitoJUnitRunner? 3 You can configure a mock to return a whole hierarchy of mocks/stubs instead of defaults (null, false, 0, etc). This allows mock configuration (even intermediate ones) bypassing the need to create ...
Catching nullpointerexception in Java - Stack Overflow
Although a NPE can be caught you definitely shouldn't do that but fix the initial issue, which is the Check_Circular method.
java - Safe get value from chain without NPE - Stack Overflow
2020年1月17日 · Does anyone know any solution to safely get value without NPE and without a lot of if statements? For example, we have: userInfo.getAddressInfo().getCityName(), how to get cityName without null-che...
Optional.of(null)will throw NPE, I need to verify null before call the ...
2017年4月11日 · Optional does not prevent from throwing an NPE, It makes it very easy to avoid, but you have to do your part, for example, I would refactor your code to something like this.
When is it OK to catch NullPointerException? - Stack Overflow
In many cases of catching NullPointerException, catch body only calls printStackTrace (). That is probably bad code. Doing nothing is rarely the correct way to recover from an NPE. If I don't catch NullPointerException and call printStackTrace (), how I can check the place where the exception occurred? You let the NPE propagate to the base level. There you catch and print (or log) a …
NullpointerException when stubbing Method - Stack Overflow
2015年10月14日 · 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.
The best way to handle or avoid NPE in java-8? - Stack Overflow
2016年7月10日 · The only feature for avoiding != null statement in java 8 is Optional, if you want to to use different patterns, you have few options: Null Object Pattern Annotation based, for example like JetBrains @NotNull/@Nullable. for more details check Java @NotNull Moreover you can check this answer in SOF about avoiding-null-statements