Simple example-structure in order to illustrate how to locate all classes where a specific annotation are used

Job.java

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Job {

    String value() default "";

}

LocateAnnotatedClasses.java

import org.reflections.Reflections;
import org.reflections.scanners.ResourcesScanner;
import org.reflections.scanners.SubTypesScanner;
import org.reflections.scanners.TypeAnnotationsScanner;
import org.reflections.util.ClasspathHelper;
import org.reflections.util.ConfigurationBuilder;
import org.reflections.util.FilterBuilder;

import java.util.stream.Stream;

/**
 * Simple dummy start task related to the startup of this jar-file. Simply prints the various possibilities found within the jar-thing
 * 
 * @author <a href="mailto:[email protected]">vegard aasen</a>
 */
public class Operation {

    private static final String PACKAGE = "my.package.structure";

    public static void main(String... args) {
        System.out.println("####\nWelcome to the Batch scripts\n#####\n\nThis project does not have any default methods, however you may try any of the following jobs registered in the library:\n");
        locateMainMethodClasses();
    }

    private static void locateMainMethodClasses() {
        new Reflections(new ConfigurationBuilder()
                .setScanners(new SubTypesScanner(false), new ResourcesScanner())
                .addScanners(new TypeAnnotationsScanner())
                .setUrls(ClasspathHelper.forClassLoader(new ClassLoader[]{ClasspathHelper.contextClassLoader(), ClasspathHelper.staticClassLoader()}))
                .filterInputsBy(new FilterBuilder().include(FilterBuilder.prefix(PACKAGE))))
                .getTypesAnnotatedWith(Job.class)
                .stream()
                .forEach(
                        c -> System.out.println(String.format("[COMMAND] java -cp <this-file>.jar %s --- (%s)", c.getName(), Stream.of(c.getAnnotations()).findFirst().get()))
                );
    }

}