Applying Sebb's patch - CODEC-70 - to improve thread safety

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@672992 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

src/java/org/apache/commons/codec/net/URLCodec.java

@@ -53,9 +53,9 @@ public class URLCodec implements BinaryEncoder, BinaryDecoder, StringEncoder, St
     /**
      * The default charset used for string decoding and encoding.
      */
-    protected String charset = CharacterEncodingNames.UTF8;
+    protected final String charset;
 
-    protected static byte ESCAPE_CHAR = '%';
+    protected static final byte ESCAPE_CHAR = '%';
     /**
      * BitSet of www-form-url safe characters.
      */
@@ -88,7 +88,7 @@ public class URLCodec implements BinaryEncoder, BinaryDecoder, StringEncoder, St
      * Default constructor.
      */
     public URLCodec() {
-        super();
+        this(CharacterEncodingNames.UTF8);
     }
 
     /**