Fixed class finder jar entry error.

src/main/java/com/realtimetech/reflection/classfile/ClassFinder.java

@@ -1,48 +1,60 @@
 package com.realtimetech.reflection.classfile;
 
-import java.io.File;
 import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.file.FileSystemNotFoundException;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.LinkedList;
-import java.util.List;
+import java.util.stream.Stream;
 
 public class ClassFinder {
-	private static void recursiveSearch(File directory, String packageName, List<Class<?>> resultClasses) throws ClassNotFoundException {
-		if (directory.exists()) {
-			File[] files = directory.listFiles();
-			for (File file : files) {
-				if (file.isDirectory()) {
-					recursiveSearch(file, packageName + "." + file.getName(), resultClasses);
-				} else if (file.getName().endsWith(".class")) {
-					resultClasses.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
-				}
-			}
-		}
-	}
-
 	public static Class<?>[] getClassInPackages(Class<?> packageInClass) throws IOException {
 		return getClassInPackages(packageInClass.getPackageName());
 	}
 
 	public static Class<?>[] getClassInPackages(String... packageNames) throws IOException {
 		LinkedList<Class<?>> resultClasses = new LinkedList<Class<?>>();
 
-		for(String packageName : packageNames) {
-			String path = packageName.replace('.', '/');
-
-			Enumeration<URL> resources = Thread.currentThread().getContextClassLoader().getResources(path);
-			List<File> directories = new LinkedList<File>();
+		for (String packageName : packageNames) {
+			String packagePath = packageName.replace('.', '/');
+			Enumeration<URL> resources = Thread.currentThread().getContextClassLoader().getResources(packagePath);
 
 			while (resources.hasMoreElements()) {
-				URL resource = resources.nextElement();
-				directories.add(new File(resource.getFile()));
-			}
-
-			for (File directory : directories) {
 				try {
-					recursiveSearch(directory, packageName, resultClasses);
-				} catch (ClassNotFoundException e) {
+					URL resource = resources.nextElement();
+					URI packageUri = resource.toURI();
+
+					Path root;
+
+					if (packageUri.toString().startsWith("jar:")) {
+						try {
+							root = FileSystems.getFileSystem(packageUri).getPath(packagePath);
+						} catch (final FileSystemNotFoundException e) {
+							root = FileSystems.newFileSystem(packageUri, Collections.emptyMap()).getPath(packagePath);
+						}
+					} else {
+						root = Paths.get(packageUri);
+					}
+
+					final String extension = ".class";
+					try (final Stream<Path> allPaths = Files.walk(root)) {
+						allPaths.filter(Files::isRegularFile).forEach(file -> {
+							try {
+								final String path = file.toString().replace('/', '.');
+								final String name = path.substring(path.indexOf(packageName), path.length() - extension.length());
+								resultClasses.add(Class.forName(name));
+							} catch (final ClassNotFoundException | StringIndexOutOfBoundsException ignored) {
+							}
+						});
+					}
+				} catch (URISyntaxException e) {
 				}
 			}
 		}