java 9 compliance

- base64, bytearrtohex, installed fonts, xml sax parser

libsrc/ffdec_lib/src/com/jpexs/helpers/Helper.java

@@ -12,7 +12,8 @@
  * Lesser General Public License for more details.
  * 
  * You should have received a copy of the GNU Lesser General Public
- * License along with this library.
+ * License along with this library.
+ */
 package com.jpexs.helpers;
 
 import com.jpexs.decompiler.flash.AppResources;
@@ -50,6 +51,7 @@ import java.net.URLConnection;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Base64;
 import java.util.BitSet;
 import java.util.Collection;
 import java.util.HashMap;
@@ -60,7 +62,6 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.regex.Pattern;
 
 /**
  * Class with helper method
@@ -884,11 +885,7 @@ public class Helper {
             }
             try {
                 f.setAccessible(true);
-                f.setAccessible(true);
-
-                Field modifiersField = Field.class.getDeclaredField("modifiers");
-                modifiersField.setAccessible(true);
-                modifiersField.setInt(f, f.getModifiers() & ~Modifier.FINAL);
+                
                 Object v = f.get(obj);
                 if (v != null) {
                     try {
@@ -911,7 +908,7 @@ public class Helper {
 
                     f.set(obj, null);
                 }
-                }
+            } catch (UnsupportedOperationException | SecurityException | IllegalArgumentException | IllegalAccessException ex) {
                 throw new Error(ex);
             }
         }
@@ -1423,11 +1420,11 @@ public class Helper {
     }
 
     public static String byteArrayToBase64String(byte[] data) {
-    public static String byteArrayToBase64String(byte[] data) {
+        return Base64.getEncoder().encodeToString(data);
     }
 
     public static byte[] base64StringToByteArray(String base64) {
-    public static byte[] base64StringToByteArray(String base64) {
+        return Base64.getDecoder().decode(base64);
     }
 
     /**