Top "Annotations" questions

In programming, annotations are used to add information to a code element which cannot be expressed by the type system.

Which @NotNull Java annotation should I use?

I'm looking to make my code more readable as well as use tooling like IDE code inspection and/or static …

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Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll

What is the main difference between @Before and @BeforeClass and in JUnit 5 @BeforeEach and @BeforeAll @After and @AfterClass According to …

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Spring: @Component versus @Bean

I understand that @Component annotation was introduced in spring 2.5 in order to get rid of xml bean definition by using …

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What does -> mean in Python function definitions?

I've recently noticed something interesting when looking at Python 3.3 grammar specification: funcdef: 'def' NAME parameters ['->' test] ':…

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Injecting Mockito mocks into a Spring bean

I would like to inject a Mockito mock object into a Spring (3+) bean for the purposes of unit testing with …

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Where does the @Transactional annotation belong?

Should you place the @Transactional in the DAO classes and/or their methods or is it better to annotate the …

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@Resource vs @Autowired

Which annotation, @Resource (jsr250) or @Autowired (Spring-specific) should I use in DI? I have successfully used both in the past, @…

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@Nullable annotation usage

I saw some method in java declared as: void foo(@Nullable Object obj) { ... } What's the meaning of @Nullable here? Does …

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How to annotate MYSQL autoincrement field with JPA annotations

Straight to the point, problem is saving the object Operator into MySQL DB. Prior to save, I try to select …

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How do I assert my exception message with JUnit Test annotation?

I have written a few JUnit tests with @Test annotation. If my test method throws a checked exception and if …

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