# javax.annotation.processing

***

**1. Automating Field and Method Injection Using Dagger 2 (FieldInjection):**

```java
@Inject
private MyService myService;
```

**2. Field and Method Injection Without Explicit Constructor Parameters (Processor):**

```java
@Inject
public MyService() { ... }
```

**3. Custom Annotation-Based Logging (Logging):**

```java
@Log(level = Level.INFO)
public void myMethod() { ... }
```

**4. Bean Validation for Data Model Validation (@NotNull):**

```java
@NotNull
private String myProperty;
```

**5. ModelMapper for Simplified Object Mapping (@ModelMap):**

```java
@ModelMap(target = MyTarget.class)
public MySource { ... }
```

**6. Lombok for Automating Getter, Setter, and Builder Methods (@Getter, @Setter, @Builder):**

```java
@Getter @Setter @Builder
public class MyModel { ... }
```

**7. Hibernate Validation for More In-Depth Validation (@Column):**

```java
@Column(nullable = false, length = 255)
private String myProperty;
```

**8. AutoValue for Immutable Value Objects (@AutoValue):**

```java
@AutoValue
public abstract class MyModel {
  public abstract String getName();
}
```

**9. ButterKnife for Efficient View Binding (@BindView, @OnClick):**

```java
@BindView(R.id.my_button)
Button myButton;
@OnClick(R.id.my_button)
public void onClickButton() { ... }
```

**10. DI Binding for Properties Using Spring Boot (@Value):**

```java
@Value("${my.property}")
private String myProperty;
```

**11. Protocol Buffers for Efficient Data Serialization and Communication (@Protobuf):**

```java
@Protobuf(name = "MyMessage")
public class MyMessage {
  private String message;
}
```

**12. Checker Framework for Detecting Null and Non-Null Values (@NonNull, @Nullable):**

```java
@NonNull
private String myProperty;
```

**13. Jacoco for Java Code Coverage (@Coverage):**

```java
@Coverage(value="100%")
public class MyTest { ... }
```

**14. Spock Framework for BDD-Style Testing in Java (@Unroll, @Ignore):**

```java
@Unroll
def "myMethod should return #value for #input"() { ... }
```

**15. JUnit 5 for Parameterized Tests (@ParameterizedTest):**

```java
@ParameterizedTest
@CsvSource({ "1, 1", "2, 4", "3, 9" })
void testMyMethod(int input, int value) { ... }
```

**16. Java PathMatcher for Wildcard-Based String Comparison (PathPattern):**

```java
PathPattern pathPattern = new PathPattern("/my/path/*");
```

**17. Bean Validator for JSR 303 Bean Validation (Constraint):**

```java
@Constraint(validatedBy = MyValidator.class)
public @interface MyConstraint {
  String message() default "invalid";
}
```

**18. Spring Boot Test for Integration Testing (@SpringBootApplication):**

```java
@SpringBootApplication
@SpringBootTest
class MyIntegrationTest { ... }
```

**19. HTTPie for Writing and Testing Command-Line HTTP Requests (@Get, @Post):**

```java
@Post
@Path("/some/url")
@Body
@Text
public class MyHttpieCommand { ... }
```

**20. Retrofit for Creating Type-Safe REST APIs (Path):**

```java
@GET("/some/path")
public Call<MyResponse> getMyResponse();
```

**21. Guava Expiring Map for Automatically Removing Expired Entries (@ExpiresAfterAccess):**

```java
Map<String, String> cache = ExpiringMap.newBuilder().setExpiresAfterAccess(10, TimeUnit.MINUTES).build();
```

**22. Gson for Serialization and Deserialization of JSON (@SerializedName, @Expose):**

```java
@SerializedName("my_property")
@Expose
private String myProperty;
```

**23. Jackson for Serialization and Deserialization of JSON (@JsonProperty, @JsonUnwrapped):**

```java
@JsonProperty("my_property")
@JsonUnwrapped
private MyModel myProperty;
```

**24. Apache Commons BeanUtils for Dynamic Property Access (BeanFactory):**

```java
BeanFactory beanFactory = new BeanFactory();
Object propertyValue = beanFactory.getProperty(bean, "myProperty");
```

**25. Spring Expression Language for Evaluated Expressions at Runtime (Expression):**

```java
@Expression("#{'Hello, ' + name}")
private String myGreeting;
```

**26. Hibernate Envers for Tracking Data Changes (Audited):**

```java
@Audited
public class MyEntity { ... }
```

**27. Lombok @Data for Generating Common Getters, Setters, Equals, and HashCode (@Data):**

```java
@Data
public class MyModel {
  private String name;
  private int age;
}
```

**28. JUnit 4 for Parameterized Tests (@Parameters):**

```java
@Parameters
public static Collection<Object[]> data() { ... }
```

**29. Mockito for Mocking and Stubbing (@Mock, @InjectMocks):**

```java
@Mock
private MyService myService;

@InjectMocks
private MyController myController;
```

**30. RxJava for Reactive Programming (@Observable, @Subscribe):**

```java
@Observable
public Observable<String> myObservable() { ... }

@Subscribe
public void onNext(String value) { ... }
```

**31. EclipseLink for Object-Relational Mapping (Entity):**

```java
@Entity
@Table(name = "MY_TABLE")
public class MyEntity { ... }
```

**32. Spring Security for Authentication and Authorization (Secured):**

```java
@Secured("ROLE_ADMIN")
public void myMethod() { ... }
```

**33. JodaTime for Working with Dates and Times (@DateTimeFormat):**

```java
@DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
private Date myDate;
```

**34. GsonBuilder for Customizing Gson Serialization and Deserialization (Expose):**

```java
Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
```

**35. Apache Commons Lang for Common String Utilities (@StringUtils):**

```java
String myString = StringUtils.capitalize(myString);
```

**36. Google Guice for Dependency Injection (@Inject, @Provides):**

```java
@Inject
private MyService myService;

@Provides
public MyService provideMyService() { ... }
```

**37. Spring Data JPA for Repository Creation and Data Access (@Repository):**

```java
@Repository
public interface MyRepository extends CrudRepository<MyEntity, Long> { ... }
```

**38. Hibernate Validator for JSR 303 Bean Validation (@Valid):**

```java
@Valid
private MyModel myModel;
```

**39. Spring Web for Handling HTTP Requests and Responses (@RequestMapping, @ResponseBody):**

```java
@RequestMapping("/my-path")
@ResponseBody
public String myMethod() { ... }
```

**40. Lombok @ToString for Generating a String Representation of an Object (@ToString):**

```java
@ToString
public class MyModel { ... }
```

**41. Apache Commons Collections for Common Data Structures and Algorithms (@CollectionUtils):**

```java
List<String> myList = CollectionUtils.isEmpty(myList) ? new ArrayList<>() : myList;
```

**42. JodaTime for Working with Dates and Times (DateTime):**

```java
DateTime myDateTime = new DateTime();
```

**43. Jackson ObjectMapper for Serialization and Deserialization of JSON (ObjectMapper):**

```java
ObjectMapper mapper = new ObjectMapper();
```

**44. MockitoAnnotations for Mockito Initialization (@MockitoAnnotations):**

```java
@MockitoAnnotations
public class MyTest { ... }
```

**45. Apache Commons CLI for Parsing Command-Line Arguments (Option):**

```java
Option myOption = new Option("myOption", "my description");
```

**46. Spring Data MongoDB for MongoDB Repository Creation and Data Access (@Document, @Repository):**

```java
@Document(collection = "myCollection")
public class MyEntity { ... }

@Repository
public interface MyRepository extends MongoRepository<MyEntity, String> { ... }
```

**47. Guava Supplier for Lazy-Initialized Objects (@Supplier):**

```java
Supplier<MyModel> myModelSupplier = Suppliers.memoize(new Supplier<MyModel>() {
  public MyModel get() { ... }
});
```

**48. Lombok @RequiredArgsConstructor for Generating a Constructor with All Required Arguments (@RequiredArgsConstructor):**

```java
@RequiredArgsConstructor
public class MyModel { ... }
```

**49. Spring ContextConfiguration for Loading and Configuring Context (@ContextConfiguration):**

```java
@ContextConfiguration("classpath:myContext.xml")
public class MyTest { ... }
```

**50. Mockito ArgumentCaptor for Capturing Argument Values Mocked Methods (@ArgumentCaptor):**

```java
ArgumentCaptor<MyType> myArgumentCaptor = ArgumentCaptor.forClass(MyType.class);
```