Questions tagged [java-annotations]
211 questions
131
votes
5 answers
what is the use of annotations @Id and @GeneratedValue(strategy = GenerationType.IDENTITY)? Why the generationtype is identity?
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Why we are using this annotations?
i need to know if this autoincrement my table id values.
(GenerationType.IDENTITY) is there any other types whats actually happening when we use this…
Lijo
- 6,498
- 5
- 49
- 60
66
votes
4 answers
Is a Python Decorator the same as Java annotation, or Java with Aspects?
Are Python Decorators the same or similar, or fundamentally different to Java annotations or something like Spring AOP, or Aspect J?
bn.
- 7,739
- 7
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- 54
51
votes
2 answers
Difference between @EntityScan and @ComponentScan
I am trying to understand the difference here. I see that a class has been annotated with both of them with same package example :
@Configuration
@EntityScan("some.known.persistence")
@ComponentScan({ "some.known.persistence"})
public class…
Raghuveer
- 2,859
- 7
- 34
- 66
49
votes
1 answer
Using Room's @ForeignKey as @Entity parameter in Kotlin
I came across a Room tutorial that makes use of the @PrimaryKey annotation on the class definition:
@Entity(foreignKeys = @ForeignKey(entity = User.class,
parentColumns = "id",
childColumns…
Chisko
- 3,092
- 6
- 27
- 45
30
votes
2 answers
Visual Studio Code - Java - Lombok - The method is undefined for the type
I downloaded the following project and imported it into Visual Studio Code:
https://github.com/oktadeveloper/okta-spring-boot-2-angular-5-example
I have a problem on the following class, when invoking:…
davidesp
- 3,743
- 10
- 39
- 77
27
votes
2 answers
Android studio warning - InnerClass annotations are missing corresponding EnclosingMember annotations
I recently upgraded to Android Studio 3.1 and upon building my Kotlin with Java project I got the following warning.
InnerClass annotations are missing corresponding EnclosingMember
annotations. Such InnerClass annotations are ignored.
Message…
j2emanue
- 60,549
- 65
- 286
- 456
27
votes
1 answer
How to suppress lombok warnings
I have an Entity
@Builder
class MyEntity {
private Set children = new HashSet<>()
}
And i get a lombok warning.
warning: @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve…
Bukharov Sergey
- 9,767
- 5
- 39
- 54
13
votes
1 answer
Annotation processing, RoundEnvironment.processingOver()
While reading the code of a custom annotation processor in Java,
I noticed this piece of code in the processor's process method:
@Override
public boolean process(Set annotations, RoundEnvironment roundEnv) {
if…
Mohammed Aouf Zouag
- 17,042
- 4
- 41
- 67
12
votes
1 answer
What is the relation between Spring @Transactional and Spring @Lock annotation?
I found that the @Transactional is used to ensure transaction on repository method or on a service method.
@Lock is used on repository method to ensure locking of entity to provide isolation.
Some questions are raised in my mind:
What are major…
kayesh parvez
- 323
- 1
- 2
- 9
12
votes
1 answer
Additional methods in java Builder class (lombok annotation)
SO, I have class that uses @Builder lombok annotation.
This is how it looks and how I use it:
import lombok.Builder;
import lombok.Data;
import com.fasterxml.jackson.annotation.JsonProperty;
@Data
@Builder
public class MyModel {
…
Bilberryfm
- 507
- 2
- 11
- 28
11
votes
2 answers
How to create a customisation annotation for splitting request param and collect return result?
I have a method params is a list which is lager than 50000 items;
Limited to the business logic, the list must less than 30000, so that I have a method to split this array to 2d array before the logic
public static final Collection>…
Ben Luk
- 735
- 2
- 8
- 15
10
votes
2 answers
Repeatable annotation target subset mismatch compiler error
I have the following annotation;
@Repeatable(Infos.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.Type, ElementType.Constructor})
public @interface Info {
String[] value() default {};
}
and as you see, it is repeatable, and…
buræquete
- 14,226
- 4
- 44
- 89
10
votes
1 answer
Writing custom lint warning to check for custom annotation
I have written the following annotation:
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import…
Adam
- 2,167
- 5
- 19
- 33
10
votes
5 answers
Mocking the Qualified beans using mockito for a spring-boot application
consider my scenario
public class SomeClass {
@Autowired @Qualifier("converter1") private IConverter converter1;
@Autowired @Qualifier("converter2") private IConverter converter2;
public void doSomeAction(String mimeType) {
…
amith
- 399
- 1
- 2
- 11
9
votes
2 answers
org.jetbrains.annotations.NotNull instead of javax.annotation.Nonnull when implement method in Intellij IDEA
After recent JetBrains Intellij IDEA updates I found out that when I'm trying to implement method annotated with javax.annotation.Nonnull - IDE implements it with org.jetbrains.annotations.NotNull instead.
Example:
If you have an interface:
import…
Mikita 123
- 93
- 1
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