Reflections reflections = new Reflections("com.my.project");

Set<Class<?>> subTypes =
  reflections.get(SubTypes.of(SomeType.class).asClass());

Set<Class<?>> annotated = 
  reflections.get(SubTypes.of(TypesAnnotated.with(SomeAnnotation.class)).asClass());

Set<Class<? extends SomeType>> subTypes =
  reflections.getSubTypesOf(SomeType.class);

Set<Class<?>> annotated = 
  reflections.getTypesAnnotatedWith(SomeAnnotation.class);

// typical usage: scan package with the default scanners SubTypes, TypesAnnotated
Reflections reflections = new Reflections(
  new ConfigurationBuilder()
    .forPackage("com.my.project")
    .filterInputsBy(new FilterBuilder().includePackage("com.my.project")));

import static org.reflections.scanners.Scanners.*;

// scan package with specific scanners
Reflections reflections = new Reflections(
  new ConfigurationBuilder()
    .forPackage("com.my.project")
    .filterInputsBy(new FilterBuilder().includePackage("com.my.project").excludePackage("com.my.project.exclude"))
    .setScanners(TypesAnnotated, MethodsAnnotated, MethodsReturn));

import static org.reflections.scanners.Scanners.*;

// SubTypes
Set<Class<?>> modules = 
  reflections.get(SubTypes.of(Module.class).asClass());

// TypesAnnotated (*1)
Set<Class<?>> singletons = 
  reflections.get(TypesAnnotated.with(Singleton.class).asClass());

// MethodsAnnotated
Set<Method> resources =
  reflections.get(MethodsAnnotated.with(GetMapping.class).as(Method.class));

// FieldsAnnotated
Set<Field> ids = 
  reflections.get(FieldsAnnotated.with(Id.class).as(Field.class));

// Resources
Set<String> properties = 
  reflections.get(Resources.with(".*\\.properties"));

// MethodsReturn
Set<Method> voidMethods = 
  reflections.get(MethodsReturn.with(void.class).as(Method.class));

// MethodsSignature
Set<Method> someMethods = 
  reflections.get(MethodsSignature.of(long.class, int.class).as(Method.class));

// MethodsParameter
Set<Method> pathParam = 
  reflections.get(MethodsParameter.of(PathParam.class).as(Method.class));

// ConstructorsAnnotated
Set<Constructor> injectables =
  reflections.get(ConstructorsAnnotated.with(Inject.class).as(Constructor.class));

// ConstructorsSignature
Set<Constructor> someConstructors = 
  reflections.get(ConstructorsSignature.of(String.class).as(Constructor.class));

// MethodParameterNamesScanner
List<String> parameterNames =
  reflections.getMemberParameterNames(member);

// MemberUsageScanner
Set<Member> usages =
  reflections.getMemberUsages(member)

import static org.reflections.ReflectionUtils.*;

Set<Class<?>>    superTypes   = get(SuperTypes.of(T));
Set<Field>       fields       = get(Fields.of(T));
Set<Constructor> constructors = get(Constructors.of(T));
Set<Methods>     methods      = get(Methods.of(T));
Set<URL>         resources    = get(Resources.with(T));

Set<Annotation>  annotations  = get(Annotations.of(T));
Set<Class<? extends Annotation>> annotationTypes = get(AnnotationTypes.of(T));

// filter, as/map
QueryFunction<Store, Method> getters =
  Methods.of(C1.class)
    .filter(withModifier(Modifier.PUBLIC))
    .filter(withPrefix("get").and(withParametersCount(0)))
    .as(Method.class);

// compose Scanners and ReflectionUtils functions 
QueryFunction<Store, Method> methods = 
  SubTypes.of(type).asClass()  // <-- classpath scanned metadata
    .flatMap(Methods::of);     // <-- java reflection api

// function of function
QueryFunction<Store, Class<? extends Annotation>> queryAnnotations = 
  Annotations.of(Methods.of(C4.class))
    .map(Annotation::annotationType);

// get all annotations of RequestMapping hierarchy (GetMapping, PostMapping, ...)
Set<Class<?>> metaAnnotations =
  reflections.get(TypesAnnotated.getAllIncluding(RequestMapping.class.getName()).asClass());

QueryFunction<Store, Map<String, Object>> queryAnnotations =
  // get all controller endpoint methods      
  MethodsAnnotated.with(metaAnnotations).as(Method.class)
    .map(method ->
      // get both method's + declaring class's RequestMapping annotations   
      get(Annotations.of(method.getDeclaringClass())
        .add(Annotations.of(method))
        .filter(a -> metaAnnotations.contains(a.annotationType())))
        .stream()
        // merge annotations' member values into a single hash map
        .collect(new AnnotationMergeCollector(method)));

// apply query and map merged hashmap into java annotation proxy
Set<RequestMapping> mergedAnnotations = 
  reflections.get(mergedAnnotation
    .map(map -> ReflectionUtils.toAnnotation(map, metaAnnotation)));