如何在运行时检查一字段是否由 Lombok 注释附加? [重复]
原标题：How to Check if a Field is Annotated by a Lombok Annotation at Runtime? [duplicate]
This question already has answers here:
Lombok @Getter and @Setter annotations are not being recognised when getAnnoations() method is used (1 answer)
lombok @NonNull on Field not readable using getAnnotations (1 answer)
Closed 6 days ago.
I need to check if a field in a class is annotated with @EqualsAndHashCode.Exclude from Lombok. However, it seems that due to the Lombok annotations being processed at compile-time, I cannot check them at runtime.
I have tried the following approaches:
EqualsAndHashCode.Exclude exclude = field.getAnnotation(EqualsAndHashCode.Exclude.class);
and
field.isAnnotationPresent(EqualsAndHashCode.Exclude.class);
Both methods do not seem to work. Here is a snippet of my current code:
import lombok.EqualsAndHashCode;
import java.lang.reflect.Field;
public class ReflectionUtils {
public static void checkLombokAnnotation(Object target) {
Field[] fields = target.getClass().getDeclaredFields();
for (Field field : fields) {
if (field.isAnnotationPresent(EqualsAndHashCode.Exclude.class)) {
System.out.println(field.getName() + " is excluded.");
} else {
System.out.println(field.getName() + " is not excluded.");
}
}
}
}
问题回答
EqualsAndHashCode is declared as
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.SOURCE)
public @interface EqualsAndHashCode {
}
RetentionPolicy.SOURCE means it is discarded by the compiller, so you can t get it at runtime.
相关问题
Spring Properties File
Hi have this j2ee web application developed using spring framework. I have a problem with rendering mnessages in nihongo characters from the properties file. I tried converting the file to ascii using ...
What do you say of chopping type-4 UUID in this manner
Check this,
List<String> list = new ArrayList<String>();
for (int i = 0; i < 10000; i++) {
String value = (""+UUID.randomUUID().getLeastSignificantBits()).substring(3, ...
combining decorator and state pattern in java - question about OO design
I am in the middle of solving a problem where I think it s best suited for a decorator and a state pattern. The high level setting is something like a sandwich maker and dispenser, where I have a set ...
Unable to execute stored Procedure using Java and JDBC on SQL server
I have been trying to execute a MS SQL Server stored procedure via JDBC today and have been unsuccessful thus far. The stored procedure has 1 input and 1 output parameter. With every combination I ...
Logging a global ID in multiple components
I have a system which contains multiple applications connected together using JMS and Spring Integration. Messages get sent along a chain of applications.
[App A] -> [App B] -> [App C]
We set a ...
Java Library Size
If I m given two Java Libraries in Jar format, 1 having no bells and whistles, and the other having lots of them that will mostly go unused.... my question is:
How will the larger, mostly unused ...
How to get the Array Class for a given Class in Java?
I have a Class variable that holds a certain type and I need to get a variable that holds the corresponding array class. The best I could come up with is this:
Class arrayOfFooClass = java.lang....
SQLite , Derby vs file system
I m working on a Java desktop application that reads and writes from/to different files. I think a better solution would be to replace the file system by a SQLite database.
How hard is it to migrate ...
