{"id":3716,"date":"2021-06-30T08:26:00","date_gmt":"2021-06-30T09:26:00","guid":{"rendered":"https:\/\/ciit-software.com\/?p=3716"},"modified":"2023-12-28T13:24:54","modified_gmt":"2023-12-28T14:24:54","slug":"overview-spring-annotations","status":"publish","type":"post","link":"https:\/\/ciit-software.com\/en\/overview-spring-annotations\/","title":{"rendered":"Overview Spring Annotations"},"content":{"rendered":"
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Customers are regularly asking me if there is some overview over the most important Spring annotations. Until now I always refused to create such an overview, too simplified it would be, I thought.<\/p>

Finally, I did it and I thought, maybe it might be useful for beginners using Spring framework and related APIs.<\/p>

Hope it helps anyone. If, please share using the buttons on the top.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Contents<\/span><\/p>

Overview Spring Annotations<\/span><\/a><\/span><\/p>

Implicit bean definition using stereotype annotations<\/span><\/a><\/span><\/p>

Spring configuration classes<\/span><\/a><\/span><\/p>

Annotations for dependency injection<\/span><\/a><\/span><\/p>

RestController annotations<\/span><\/a><\/span><\/p>

REST Exception Handlers<\/span><\/a><\/span><\/p>

Scope annotations<\/span><\/a><\/span><\/p>

JPA & Lombok Annotations<\/span><\/a><\/span><\/p>

Spring Data Annotations<\/span><\/a><\/span><\/p>

AOP annotations<\/span><\/a><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/a>Implicit bean definition using stereotype annotations<\/span><\/h1>

@Component
<\/span>public class\u00a0<\/span>MyComponent<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/ Spring Bean with arbitrary role in application
<\/span><\/i>}<\/span><\/p>

\u00a0<\/span><\/p>

@Service
<\/span>public class\u00a0<\/span>MyService<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/ Spring bean that acts as a service
\u00a0\u00a0\u00a0\u00a0<\/span>\/\/\u00a0ie<\/span>\u00a0implements business logic
<\/span><\/i>}<\/span><\/p>

\u00a0<\/span><\/p>

@RestController
@RequestMapping<\/span>(<\/span>\u201c\/api\/myrestcontroller\u201d<\/span>)
<\/span>public class\u00a0<\/span>MyRestController<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/spring bean that acts as a rest controller with base\u00a0url<\/span>\u00a0\u201e\/api<\/span>\/myrestcontroller<\/span>\u201e
<\/span><\/i>}<\/span><\/p>

\u00a0<\/span><\/p>

@Repository
<\/span>public class\u00a0<\/span>MyRepository<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/ Spring bean which acts as a repository
\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ all database (jdbc<\/span>,\u00a0yep<\/span>, \u2026) exceptions are mapped to subclasses of\u00a0DataAccessException<\/span>
<\/span><\/i>}<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/a>Spring configuration classes<\/span><\/h1>

@Configuration\u00a0\u00a0<\/span><\/span>\/\/ denotes the class as a configuration class
\/\/ Configuration classes are called only by the spring container
\/\/ never by the programmers code
<\/span><\/i>public class\u00a0<\/span><\/span>MyConfig<\/span><\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/configuration classes define 1\u00a0volume<\/span>\u00a0Spring Beans
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@Bean<\/span>(<\/span>\u201calbert\u201d<\/span><\/span>)\u00a0<\/span>\/\/ Name of the bean
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>string\u00a0nameOfGenius<\/span>(){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span><\/span>"Albert Einstein"<\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span>}

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Bean\u00a0<\/span>\/\/name defaults to method name
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>LocalDate<\/span><\/span>\u00a0birthDateOfGenius<\/span>(){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span><\/span>LocalDate.of<\/i><\/span><\/span>(<\/span>1879<\/span>,\u00a0<\/span>3\u00a0<\/span>,\u00a0<\/span>14<\/span>);
\u00a0\u00a0\u00a0\u00a0<\/span>}

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Bean\u00a0<\/span>\/\/ Parameter injection example
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>HumanBeing<\/span><\/span>\u00a0Albert Einstein<\/span>(<\/span>@Value<\/span>(<\/span>\u201c#{albert}\u201d<\/span><\/span>)String name,
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Value<\/span>(<\/span>\u201c#{birthDateOfGenius}\u201d<\/span><\/span>)LocalDate\u00a0birthDate<\/span>){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return new\u00a0<\/span><\/span>HumanBeing<\/span><\/span>(Surname,\u00a0birthDate<\/span>);
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/a>Annotations for dependency injection<\/span><\/h1>

public class\u00a0<\/span><\/span>InjectionsUsingAutowired<\/span><\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired\u00a0<\/span>\/\/ field dependency injection by type
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>private\u00a0<\/span><\/span>StudentRepo<\/span><\/span>\u00a0<\/span>studentRepo<\/span><\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>MyService<\/span><\/span>\u00a0<\/span>myService<\/span><\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>TrainingRepo<\/span><\/span>\u00a0<\/span>trainingRepo<\/span><\/span><\/span>;

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired\u00a0<\/span>\/\/ constructor dependency injection by type
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>InjectionsUsingAutowired<\/span><\/span>(MyService<\/span>\u00a0myService<\/span>) {
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>this<\/span><\/span>.<\/span>myService<\/span><\/span><\/span>\u00a0<\/span><\/span>=\u00a0myService<\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span>}

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired\u00a0<\/span>\/\/ setter dependency injection by type
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public void\u00a0<\/span><\/span>setTrainingRepo<\/span><\/span>(TrainingRepo<\/span>\u00a0trainingRepo<\/span>) {
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>this<\/span><\/span>.<\/span>trainingRepo<\/span><\/span><\/span>\u00a0<\/span><\/span>=\u00a0trainingRepo<\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>

\u00a0<\/span><\/p>

public class\u00a0<\/span><\/span>InjectionsUsingValue<\/span><\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Value<\/span>(<\/span>\u201c#{studentRepo}\u201d<\/span><\/span>)\u00a0<\/span>\/\/ field dependency injection by bean name
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>private\u00a0<\/span><\/span>StudentRepo<\/span><\/span>\u00a0<\/span>studentRepo<\/span><\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>MyService<\/span><\/span>\u00a0<\/span>myService<\/span><\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>TrainingRepo<\/span><\/span>\u00a0<\/span>trainingRepo<\/span><\/span><\/span>;

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired\u00a0<\/span>\/\/ constructor dependency injection by bean name
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>InjectionsUsingValue<\/span><\/span>(<\/span>@Value<\/span>(<\/span>\u201c#{myServiceImpl1}\u201d<\/span><\/span>)\u00a0MyService<\/span>\u00a0myService<\/span>) {
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>this<\/span><\/span>.<\/span>myService<\/span><\/span><\/span>\u00a0<\/span><\/span>=\u00a0myService<\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span>}

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired\u00a0<\/span>\/\/ setter dependency injection by bean name
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public void\u00a0<\/span><\/span>setTrainingRepo<\/span><\/span>(<\/span>@Value<\/span>(<\/span>\u201c#{trainingRepo}\u201d<\/span><\/span>)\u00a0TrainingRepo<\/span>\u00a0trainingRepo<\/span>) {
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>this<\/span><\/span>.<\/span>trainingRepo<\/span><\/span><\/span>\u00a0<\/span><\/span>=\u00a0trainingRepo<\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>

\u00a0<\/span><\/p>

\u00a0<\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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RestController<\/span><\/span><\/span>\u00a0annotations<\/span><\/span><\/h1>

@RestController<\/span>
<\/span>@RequestMapping<\/span>(<\/span>\u201e<\/span>\/api\/customers<\/span>\u201e<\/span>)
<\/span>public class\u00a0<\/span>CustomerRestController<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span>CustomerRepo<\/span><\/span>\u00a0<\/span>customerRepo<\/span><\/span>;

<\/span><\/p>

\/\/GET http:\/\/localhost:8080\/api\/customers<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@GetMapping
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>Cunning<\/span><<\/span>Customer<\/span>>\u00a0<\/span>findAllCustomers<\/span><\/span><\/span>(<\/span><\/span>){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>customerRepo<\/span>.findAll<\/span><\/span>();
\u00a0\u00a0\u00a0\u00a0<\/span>}

<\/span><\/p>

\/\/ GET http:\/\/localhost:8080\/api\/customers\/search?name=Michael<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@GetMapping<\/span>(<\/span>\u201e<\/span>search<\/span>\u201e<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>Cunning<\/span><<\/span>Customer<\/span>>\u00a0<\/span>findCustomerByName<\/span><\/span>(<\/span>@RequestParam<\/span>(<\/span>\u201e<\/span>Surname<\/span>\u201e<\/span>)<\/span>string<\/span><\/span>\u00a0<\/span>Surname){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>customerRepo<\/span>.findByName<\/span><\/span>(Surname);
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>


<\/span>\/\/GET http:\/\/localhost:8080\/api\/customers\/12<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@GetMapping<\/span>(<\/span>\u201e<\/span>{id}<\/span>\u201e<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>ResponseEntity<\/span><\/span><<\/span>Customer<\/span>>\u00a0<\/span>findById<\/span><\/span>(<\/span>@PathVariable<\/span>(<\/span>\u201e<\/span>id<\/span>\u201e<\/span>)\u00a0<\/span>Long\u00a0<\/span>id<\/span>){<\/span><\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>ResponseEntity<\/span>.of<\/i><\/span><\/span>(<\/span>customerRepo<\/span>.findById<\/span><\/span>(id));
\u00a0\u00a0\u00a0\u00a0<\/span>}

<\/span><\/p>

\/\/DELETE http:\/\/localhost:8080\/api\/customers\/12
<\/span><\/i>\u00a0\u00a0\u00a0\u00a0<\/span>@DeleteMapping<\/span>(<\/span>\u201e<\/span>{id}<\/span>\u201e<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@PreAuthorize<\/span>(<\/span>"hasAnyRole('ADMIN')"<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0boolean<\/span>\u00a0<\/span>deleteById<\/span><\/span>(<\/span>@PathVariable<\/span>(<\/span>\u201e<\/span>id<\/span>\u201e<\/span>)<\/span>Long<\/span><\/span>\u00a0<\/span>id<\/span>){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>customerRepo<\/span>.delete<\/span><\/span>(id);
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>

\u00a0<\/span><\/p>

\/*<\/span><\/i><\/p>

POST localhost:8080\/api<\/span>\/customers
Content Type: application\/json

{
\u00a0\u00a0<\/span>\u201cname\u201d: \u201cKatarina\u201d,
\u00a0\u00a0<\/span>\u201cemail\u201d: \u201ckatarina@javatraining.at\u201d
}<\/span><\/i><\/p>

*\/<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@PostMapping<\/span>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>Customer\u00a0<\/span>Save<\/span>(<\/span><\/span>@RequestBody Customer customer<\/span>){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>customerRepo<\/span>.Save<\/span><\/span>(customer);
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/i><\/p>

\u00a0<\/span><\/p>

@RestController
@RequestMapping<\/span>(<\/span>\u201c\/api\/customers\u201d<\/span>)
<\/span>public class\u00a0<\/span>CustomerController<\/span><\/span>\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Autowired
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span>CustomerRepo<\/span><\/span>\u00a0<\/span>customerRepo<\/span><\/span>;

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@GetMapping<\/span>(<\/span>\u201c{id}\u201d<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>ResponseEntity<\/span><\/span>\u00a0<\/span>findById<\/span><\/span>(<\/span>@PathVariable<\/span>(<\/span>\u201cid\u201d<\/span>)\u00a0<\/span>Long\u00a0<\/span>id){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>Optional<\/span><<\/span>Customer<\/span>>\u00a0<\/span>customerOpt<\/span><\/span>\u00a0<\/span>=\u00a0<\/span>customerRepo<\/span>.findById<\/span><\/span>(id);
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>if\u00a0<\/span>(<\/span>customerOpt<\/span>.isPresent<\/span><\/span>()){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>ResponseEntity.OK<\/i><\/span><\/span>().body(customerOpt.get<\/span>());<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}\u00a0<\/span>else\u00a0<\/span>{
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>Error\u00a0error<\/span>\u00a0<\/span>=\u00a0<\/span>new\u00a0<\/span>Error(<\/span>\u201cCouldn\u2019t find customer\u201d<\/span>,\u00a0<\/span>\u201cid=\u201d\u00a0<\/span>+id);
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>ResponseEntity.status<\/i><\/span><\/span>(HttpStatus.NOT_FOUND<\/i><\/span>).body(error);<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>

\u00a0<\/span><\/p>

\u00a0<\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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<\/a>REST Exception Handlers<\/span><\/h1>

@ControllerAdvice<\/span>
<\/span>public class\u00a0<\/span>MyExceptionHandler<\/span><\/span>\u00a0<\/span>extends\u00a0<\/span>ResponseEntityExceptionHandler<\/span><\/span>\u00a0<\/span>{

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@ExceptionHandler<\/span>({<\/span>DataAccessException<\/span>.<\/span>class<\/span>})
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>ResponseEntity<\/span><\/span><<\/span>Error<\/span>>\u00a0<\/span>handleJpaException<\/span><\/span>(<\/span>DataAccessException<\/span><\/span>\u00a0<\/span>ex,\u00a0<\/span>WebRequest<\/span><\/span>\u00a0<\/span>request){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/returning your own error object
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>Error\u00a0error<\/span>\u00a0<\/span>=\u00a0<\/span>new\u00a0<\/span>Error(<\/span>\u201cDatabase operation not\u00a0successful<\/span>.\u201c<\/span>,\u00a0ex.getMessage<\/span>());
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>return\u00a0<\/span>ResponseEntity<\/span>.<\/span>status<\/span><\/i>(<\/span>HttpStatus<\/span>.<\/span>INTERNAL_SERVER_ERROR<\/span><\/i>).body(<\/span>error<\/span>);
\u00a0\u00a0\u00a0\u00a0<\/span>}

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@ExceptionHandler<\/span>(<\/span>NullPointerException<\/span>.<\/span>class<\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span>ResponseEntity<\/span><\/span><<\/span>Object<\/span>>\u00a0<\/span>handleNullpointerException<\/span><\/span>(<\/span>NullPointerException<\/span><\/span>\u00a0<\/span>ex,\u00a0<\/span>WebRequest<\/span><\/span>\u00a0<\/span>request){
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\/\/convenience method inherited from\u00a0ResponseEntityExceptionHandler<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>return\u00a0<\/span>handleExceptionInternal<\/span><\/span>(ex,
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>"Sorry, something went wrong."<\/span>,
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span>new\u00a0<\/span>HttpHeaders<\/span><\/span>(),<\/span>HttpStatus<\/span>.<\/span>INTERNAL_SERVER_ERROR<\/span><\/i><\/span>,
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>request);
\u00a0\u00a0\u00a0\u00a0<\/span>}
}<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

Scope annotations<\/span><\/a><\/h1>

@Component
@Scope<\/span>(<\/span>\u201csingleton\u201d<\/span><\/span>)
<\/span>\/**
 <\/span>* Singleton Scope is the default scope for Spring beans.
 <\/span>* There is only one instance of this bean. It is created when application starts and lives until application terminates
 <\/span>*\/
<\/span><\/i>public class <\/span><\/span>ScopedBean<\/span><\/span> {
    <\/span><\/span>\/\/\u2026
<\/span><\/i>}<\/span><\/o:p><\/span><\/p>

@Component
@Scope<\/span>(<\/span>\u201cprototype\u201d<\/span><\/span>)
<\/span>\/**
 <\/span>* everytime<\/span> this bean is injected somewhere else
 <\/span>* a new instance will be created.
 <\/span>* It will live as long as the bean it is injected into.
 <\/span><\/span><\/i>*\/
<\/span><\/i>public<\/span><\/span><\/span> class<\/span> <\/span><\/span>ScopedBean<\/span><\/span> {
    <\/span><\/span>\/\/\u2026
<\/span><\/i>}<\/span><\/o:p><\/span><\/p>

 <\/span><\/p>

@Component
@RequestScope
<\/span>\/\/ alternatively @Scope(\u201crequest\u201d)
\/**
 <\/span>* for each user session in the browser
 <\/span>* there will be one instance of this bean
 <\/span>*\/
<\/span><\/i>public class <\/span><\/span>ScopedBean<\/span><\/span> {
    <\/span><\/span>\/\/\u2026
<\/span><\/i>}<\/span><\/o:p><\/span><\/p>

@Component
@SessionScope
<\/span>\/\/ alternatively @Scope(\u201csession\u201d)
\/**
 <\/span>* for each user session in the browser
 <\/span>* there will be one instance of this bean
 <\/span>*\/
<\/span><\/i>public class <\/span><\/span>ScopedBean<\/span><\/span> {
    <\/span><\/span>\/\/\u2026
<\/span><\/i>}<\/span><\/o:p><\/span><\/p>

 <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

<\/a>JPA & Lombok Annotations<\/span><\/h1>

@Data\u00a0<\/span>\/\/ tell\u00a0lombok<\/span>\u00a0to generate getters, setters, equals,\u00a0hashCode<\/span>,\u00a0toString<\/span>
<\/span><\/i>@NoArgsConstructor\u00a0<\/span>\/\/tell\u00a0lombok<\/span>\u00a0to generate a\u00a0noargs<\/span>\u00a0constructor
<\/span><\/i>@RequiredArgsConstructor\u00a0<\/span>\/\/tell\u00a0lombok<\/span>\u00a0to generate a constructor for all\u00a0Nonzero<\/span>\u00a0fields.fields
<\/span><\/i>@Entity\u00a0<\/span>\/\/ required on every entity
<\/span><\/i>@Table<\/span>(name=<\/span>\u201cstudents\u201d<\/span><\/span>)\u00a0<\/span>\/\/ tell JPA to which table this entity should be stored<\/span><\/i>
<\/span>public class\u00a0<\/span><\/span>College student {
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Id\u00a0\u00a0<\/span><\/span>\/\/ tell JPA that
\u00a0\u00a0<\/span>\u00a0\u00a0<\/span>\/\/ this is the primary key of the entity
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@GeneratedValue<\/span>(strategy =\u00a0GenerationType.IDENTITY<\/span><\/i><\/span><\/span>)\u00a0<\/span>\/\/ tell JPA that DB generates this value
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@Column<\/span>(name=<\/span>\u201cid\u201d<\/span><\/span>)\u00a0<\/span>\/\/ tell JPA in which column this field should be stored
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>private\u00a0<\/span><\/span>Long\u00a0<\/span>id<\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@NonNull\u00a0<\/span>\/\/ tell\u00a0lombok<\/span>\u00a0that this field will not be null \/ may not be null
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@Column<\/span>(name=<\/span>"Surname"<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>string\u00a0<\/span>Surname<\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@NonNull
\u00a0\u00a0\u00a0\u00a0<\/span>@Column<\/span>(name=<\/span>"e-mail"<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>string\u00a0<\/span>e-mail<\/span><\/span>;
}<\/span><\/p>

\u00a0<\/span><\/p>

\u00a0<\/span><\/p>

@Data
@NoArgsConstructor
@RequiredArgsConstructor
@Entity
@Table<\/span>(name=<\/span>\u201ctraining\u201d<\/span><\/span>)
<\/span>public class\u00a0<\/span><\/span>training {
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Id
\u00a0\u00a0\u00a0\u00a0<\/span>@GeneratedValue<\/span>(strategy =\u00a0GenerationType.IDENTITY<\/span><\/i><\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Column<\/span>(name=<\/span>\u201cid\u201d<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>private\u00a0<\/span><\/span>Long\u00a0<\/span>id<\/span><\/span>;
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>\u2026<\/span>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@EqualsAndHashCode.Exclude\u00a0<\/span>\/\/ tell\u00a0lombok<\/span>\u00a0that this field should not be used for equals and\u00a0hashCode<\/span>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@ManyToOne<\/span>(cascade = {CascadeType.MERGE<\/span><\/i><\/span><\/span>,\u00a0CascadeType.PERSIST<\/span><\/i><\/span><\/span>})\u00a0<\/span>\/\/ tell JPA about a foreign key (1:n) relationship to entity trainer
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@JoinColumn<\/span>(name=<\/span>\u201cid_trainer\u201d<\/span><\/span>)\u00a0<\/span>\/\/ name of the column in which the foreign key should be stored
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>private\u00a0<\/span><\/span>Trainer\u00a0<\/span>Trainer<\/span><\/span><\/span>;

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@EqualsAndHashCode.Exclude
\u00a0\u00a0\u00a0\u00a0<\/span>@ManyToMany<\/span>(cascade = {CascadeType.MERGE<\/span><\/i><\/span><\/span>,\u00a0CascadeType.PERSIST<\/span><\/i><\/span><\/span>})\u00a0<\/span>\/\/ tell JPA about a foreign key (n:m<\/span>) relationship to entity Student
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@JoinTable<\/span>(name =\u00a0<\/span>\u201etraining_to_students<\/span>\u201e<\/span><\/span>,\u00a0<\/span>\/\/ tell JPA in which mapping table the foreign key relationship is mapped
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>joinColumns<\/span><\/span>\u00a0=\u00a0<\/span>@JoinColumn<\/span>(name=<\/span>\u201cid_training\u201d<\/span><\/span>),\u00a0<\/span>\/\/ what is the column that relates to my own key
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>inverseJoinColumns<\/span><\/span>\u00a0=\u00a0<\/span>@JoinColumn<\/span>(name=<\/span>\u201cid_student\u201d<\/span><\/span>))\u00a0<\/span>\/\/ what is the column that relates to the key of entity student
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>private\u00a0<\/span><\/span>Cunning\u00a0<\/span>students\u00a0<\/span><\/span>=\u00a0<\/span>new\u00a0<\/span><\/span>ArrayList<\/span><\/span><>();
}<\/span><\/p>

\u00a0<\/span><\/p>

\u00a0<\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

<\/a>Spring Data Annotations<\/span><\/h1>

\/\/ definition of a Spring Data JPA repository
<\/span><\/i>public interface\u00a0<\/span><\/span>TrainingRepo<\/span><\/span>\u00a0<\/span>extends\u00a0<\/span><\/span>JpaRepository<\/span><\/span>,\u00a0TrainingRepoCustom<\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Query<\/span>(<\/span>\u201cselect t from Training t left join fetch\u00a0t.trainer<\/span>\u201e<\/span><\/span>)\u00a0<\/span>\/\/ defining a query using the @Query annotation
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>public\u00a0<\/span><\/span>Cunning\u00a0findAllUsingFetchJoinTrainer<\/span>();

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@EntityGraph<\/span>(attributePaths = {<\/span>\u201eTrainer",<\/span>\u201cstudents<\/span>\u201e<\/span><\/span>})\u00a0<\/span>\/\/ declaring on\u00a0entityGraph<\/span>\u00a0that should be used along with this query
\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@Query<\/span>(<\/span>\u201cselect t from Training t\u201d<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>Cunning\u00a0findAllUsingEntityGraph<\/span>();

\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>Cunning\u00a0findTrainingByTitleLike<\/span>(String title);\u00a0<\/span>\/\/ define a query using method name syntax

\u00a0\u00a0\u00a0\u00a0<\/span><\/span><\/i>@Query<\/span>(<\/span>\u201cselect t from Training t where t.trainer.name = :trainer name<\/span>\u201e<\/span><\/span>)\u00a0<\/span>\/\/ using parameters in queries<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>Cunning\u00a0findTrainingByTrainerName<\/span>(<\/span>@Param<\/span>(<\/span>\u201ccoach name\u201d<\/span><\/span>) string\u00a0trainer name<\/span>);<\/span><\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ directly query into a Data Transfer Object<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Query(<\/span><\/span><\/span>\u201cselect new\u00a0at.javatraining.jpa.entities.dtos.TrainingSummaryDto<\/span>(t.id,\u00a0t.title<\/span>,\u00a0t.begin<\/span>,\u00a0t.students.size<\/span>) from Training t\u201c<\/span><\/span>)
\u00a0<\/span>\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>List<TrainingSummaryDto<\/span>>\u00a0getTrainingSummaries<\/span>();

}<\/span><\/p>

\u00a0<\/span><\/p>

public interface\u00a0<\/span><\/span>TrainingTitleSummaryView<\/span><\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>Long\u00a0getId<\/span><\/span>(<\/span>);
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>string\u00a0getTitle<\/span>();
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Value<\/span>(<\/span>\u201c#{target.students.size()}\u201d<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public int\u00a0<\/span><\/span>getNumberOfStudents<\/span><\/span>();
}<\/span><\/p>

\u00a0<\/span><\/p>

\/\/ definition of a Spring Data JPA repository
<\/span><\/i>public interface\u00a0<\/span><\/span>TrainingRepo<\/span><\/span>\u00a0<\/span>extends\u00a0<\/span><\/span>JpaRepository<\/span><\/span>Long<\/span>>,\u00a0TrainingRepoCustom<\/span>\u00a0{
\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\u2026<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ query into a Spring projection<\/span><\/i>
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>@Query(<\/span><\/span><\/span>\u201cselect t from Training t\u201d<\/span><\/span>)
\u00a0\u00a0\u00a0\u00a0<\/span><\/span>public\u00a0<\/span><\/span>List<TrainingTitleSummaryView<\/span>>\u00a0getTrainingTitleSummaryView<\/span>();
}<\/span><\/p>

\u00a0<\/span><\/p>

\u00a0<\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

AOP annotations<\/span><\/a><\/h1>

@Aspect <\/span>\/\/ define an aspect
<\/span><\/i>@Component <\/span>\/\/ make it a spring component
<\/span><\/i>@Slf4j <\/span>\/\/ generate variables with SLF4J Logger
<\/span><\/i>public class <\/span><\/span>LoggingAspect<\/span><\/span> {

<\/span>@Around<\/span>(<\/span>\u201cexecution(* at.javatraining.trainings.service<\/span>.*.*(..))\u201c<\/span><\/span>)  <\/span><\/span>\/\/ define where the aspect should be called
    <\/span><\/span><\/i>public <\/span><\/span>Object log(ProceedingJoinPoint<\/span> pjp<\/span>) <\/span>throws <\/span><\/span>Throwable{
        <\/span>string methodName<\/span> = pjp.getSignature<\/span>().getName<\/span>();
        <\/span>String params = arrays.toString<\/i><\/span>(pjp.getArgs<\/span>());
        <\/span><\/span>log<\/span><\/i><\/span>.info(<\/span>\u201cMethod call: {} params: {}\u201d<\/span><\/span>, methodName<\/span>, params);
        <\/span>Object result = pjp.proceed<\/span>();
        <\/span><\/span>log<\/span><\/i><\/span>.info(<\/span>\u201cReturning call: {} params: {}\u201d<\/span><\/span>, methodName<\/span>, params);
        <\/span><\/span>return <\/span><\/span>result;
    <\/span>}
}<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Customers are regularly asking me if there is some overview over the most important Spring annotations. Until now I always refused to create such an overview, too simplified it would be, I thought. Finally, I did it and I thought, maybe it be might be useful for beginners using Spring framework and related APIs. Hope […]<\/p>\n","protected":false},"author":1,"featured_media":3727,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[45],"tags":[],"class_list":["post-3716","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-entwicklung"],"yoast_head":"\nOverview\u00a0Spring\u00a0Annotations - CIIT<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ciit-software.com\/en\/overview-spring-annotations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Overview\u00a0Spring\u00a0Annotations - CIIT\" \/>\n<meta property=\"og:description\" content=\"Customers are regularly asking me if there is some overview over the most important Spring annotations. 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