Full JavaPPuzzler class

JavaPPuzzler

package com.puzzlers;

import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.util.ClassUtils;
import org.springframework.util.SystemPropertyUtils;

import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @author fcamblor
 */
public class JavaPPuzzler implements Serializable {
    public static void main(String[] args) throws ClassNotFoundException, IOException {
        List<Class> classesInPuzzlerPkg = findTypesInPackage("com.puzzlers");

        // Guessing how many classes are there in package com.puzzlers ?
        System.out.println(classesInPuzzlerPkg.size()); // Answer is in (1)

        System.out.println(String.format("%n%n%n"));

        // Now, displaying every superclass for every retrieved classes
        for(Class clazz : classesInPuzzlerPkg){
            System.out.println(clazz.getName() + " has superclass : " + clazz.getSuperclass());

            // and compare it with what javap displays ... :) (2)
        }

        System.out.println(String.format("%n%n%n"));
        
        for(Class clazz : classesInPuzzlerPkg){
            System.out.println(clazz.getName() + " implements interfaces : " + Arrays.toString(clazz.getInterfaces()));

            // and compare it with what javap displays ... :) (3)
        }
    }

    /**
     * Retrieving types in given package... 'works fine, puzzler doesn't reside here ;)
     */
    private static List<Class> findTypesInPackage(String basePackage) throws IOException, ClassNotFoundException {
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resourcePatternResolver);

        List<Class> candidates = new ArrayList<Class>();
        String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
                resolveBasePackage(basePackage) + "/" + "**/*.class";
        Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
        for (Resource resource : resources) {
            if (resource.isReadable()) {
                MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource);
                //if (isCandidate(metadataReader)) {
                    candidates.add(Class.forName(metadataReader.getClassMetadata().getClassName()));
                //}
            }
        }
        return candidates;
    }
    
    private static String resolveBasePackage(String basePackage) {
        return ClassUtils.convertClassNameToResourcePath(SystemPropertyUtils.resolvePlaceholders(basePackage));
    }
    
}