fix optifine patching for some version of java

Author: Cubxity

src/main/java/cc/hyperium/installer/api/Installer.java

@@ -179,9 +179,7 @@ public void install() {
                     optifineLibDir.mkdirs();
                     File optifineLib = new File(optifineLibDir, "OptiFine-1.8.9_HD_U_I7.jar");
 
-                    InstallerUtils.loadURL(optifine.toURI().toURL());
-
-                    Class<?> patcher = Class.forName("optifine.Patcher");
+                    Class<?> patcher = InstallerUtils.loadClass(optifine.toURI().toURL(), "optifine.Patcher");
                     Method main = patcher.getMethod("main", String[].class);
                     main.invoke(null, new Object[]{new String[]{originJar.getAbsolutePath(), optifine.getAbsolutePath(), optifineLib.getAbsolutePath()}});
                 } catch (Exception ex) {

src/main/java/cc/hyperium/utils/InstallerUtils.java

@@ -106,11 +106,8 @@ public static String toHex(byte[] bytes) {
         return r.toString();
     }
 
-    public static void loadURL(URL url) throws Exception {
-        URLClassLoader ucl = (URLClassLoader) InstallerMain.class.getClassLoader();
-        Method m = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
-        m.setAccessible(true);
-        m.invoke(ucl, url);
+    public static Class<?> loadClass(URL url, String c) throws ClassNotFoundException {
+        return new URLClassLoader(new URL[]{url}).loadClass(c);
     }
 
 }