I have developed a custom annotation and custom annotation processor for Java Spring. However, when I include it in the project where I want to use it, it doesn’t work. It only works when I create the annotation processor in a separate project and include it as a module. How can I make it work in a single project?

My annotation class is

@Target(ElementType.METHOD) 
@Retention(RetentionPolicy.SOURCE)  
public @interface A  { 
}

My processor class is

@AutoService(Processor.class) 
@SupportedSourceVersion(SourceVersion.RELEASE_11) 
@SupportedAnnotationTypes("A") 
public class AProcessor extends AbstractProcessor {
    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)
    {
    
        processingEnv.getMessager().printMessage(
            Diagnostic.Kind.ERROR,
            "A annotation is used!");
        
       
        return true;
     }
}

My pom.xml file is

<groupId>org.example</groupId>
<artifactId>annotation-processing</artifactId>
<version>1.0-SNAPSHOT</version>

<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
    <dependency>
        <groupId>com.google.auto.service</groupId>
        <artifactId>auto-service</artifactId>
        <version>1.0.1</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

However, never call

process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)

method when the annotation processor is in same project.

It only works when I create the annotation processor in a separate project and include it as a module.