Questions tagged [java-annotations]
184 questions
88
votes
3 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
- 4,738
- 1
- 41
- 55
52
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.
- 7,031
- 7
- 37
- 53
49
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
- 2,248
- 3
- 29
- 55
43
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
- 2,935
- 6
- 24
- 41
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
- 51,417
- 46
- 239
- 380
20
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
- 7,996
- 3
- 31
- 48
14
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
- 2,546
- 6
- 25
- 59
12
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
- 16,366
- 3
- 36
- 64
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
- 645
- 1
- 8
- 15
9
votes
1 answer
About the parameter defined in process(...) method of Processor interface
In javax.annotation.processing package there is a interface Processor in which there is a function:
/**
* Processes a set of annotation types on type elements
* originating from the prior round and returns whether or not
* these…
Leem.fin
- 35,699
- 70
- 166
- 297
9
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…
Moses
- 1,787
- 2
- 18
- 27
7
votes
2 answers
Why does JPMS allow annotation types as services
In introducing JPMS services, section 7.7.4 of the Java Language Specification notes that "The service type must be a class type, an interface type, or an annotation type."
I'm struggling to see the point of permitting an annotation. My…
Toby Eggitt
- 1,686
- 15
- 20
7
votes
4 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
- 319
- 2
- 9
7
votes
2 answers
POJOs generated by jsonschema2pojo have annotation which Android Studio doesn't understand
When I generate POJOs via http://www.jsonschema2pojo.org/ I get something like this:
import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import…
Marian Paździoch
- 7,671
- 9
- 49
- 88
6
votes
2 answers
What's is the difference between a static and non-static annotation?
Java's inner classes can be static or non-static. Non-static inner classes are tied to an instance of the enclosing class.
Annotations are a type of Java interface, and like any other class, they can be defined inside a class. Similarly, they can be…
Brandon Yarbrough
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