import javax.annotation.processing.AbstractProcessor; 
import javax.annotation.processing.RoundEnvironment; 
import javax.annotation.processing.SupportedAnnotationTypes; 
import javax.annotation.processing.SupportedSourceVersion; 
import javax.lang.model.SourceVersion; 
import javax.lang.model.element.*; 
import javax.lang.model.type.DeclaredType; 
import javax.lang.model.type.TypeKind; 
import javax.lang.model.type.TypeMirror; 
import javax.tools.Diagnostic; 
import java.util.List; 
import java.util.Set; 

@SupportedAnnotationTypes("javax.annotation.processing.SupportedSourceVersion") 
public class ParameterPrintingProcessor extends AbstractProcessor { 
    @Override 
    public SourceVersion getSupportedSourceVersion() { 
        return SourceVersion.latestSupported(); 
    } 

    @Override 
    public boolean process(final Set<? extends TypeElement> annotations, final RoundEnvironment roundEnv) { 
        if (annotations.isEmpty() || roundEnv.processingOver()) 
            return false; // done 
        for (final Element element : roundEnv.getElementsAnnotatedWith(SupportedSourceVersion.class)) { 
            for(final Element method : ((TypeElement) element).getEnclosedElements()) { 
                if(method.getKind() != ElementKind.METHOD) 
                    continue; 
                final TypeMirror returnType = ((ExecutableElement)method).getReturnType(); 
                if(returnType.getKind() != TypeKind.DECLARED) 
                    continue; 
                final List<? extends Element> methodsAndConstructors = ((TypeElement) ((DeclaredType) returnType).asElement()).getEnclosedElements(); 
                processingEnv.getMessager().printMessage(Diagnostic.Kind.MANDATORY_WARNING, 
                        methodsAndConstructors.stream().filter(e -> e.getKind() == ElementKind.CONSTRUCTOR && e.getModifiers().contains(Modifier.PUBLIC)).map(e -> e.toString() + 
                                ": '" + ((ExecutableElement) e).getParameters().stream().map(param -> param.asType() + " " + param.getSimpleName().toString()).collect(java.util.stream.Collectors.joining(", ")) + "'" 
                        ).collect(java.util.stream.Collectors.joining(", "))); 
            } 
        } 
        return false; 
    } 
}