Use Charset instead of String for Protocol#CHARSET (#2658)

Author: JarvisCraft

src/main/java/redis/clients/jedis/Protocol.java

@@ -1,6 +1,8 @@
 package redis.clients.jedis;
 
 import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
@@ -29,7 +31,7 @@ public final class Protocol {
   public static final int DEFAULT_TIMEOUT = 2000;
   public static final int DEFAULT_DATABASE = 0;
 
-  public static final String CHARSET = "UTF-8";
+  public static final Charset CHARSET = StandardCharsets.UTF_8;
 
   public static final byte DOLLAR_BYTE = '$';
   public static final byte ASTERISK_BYTE = '*';

src/main/java/redis/clients/jedis/util/SafeEncoder.java

@@ -25,22 +25,14 @@ public static byte[][] encodeMany(final String... strs) {
   }
 
   public static byte[] encode(final String str) {
-    try {
-      if (str == null) {
-        throw new IllegalArgumentException("null value cannot be sent to redis");
-      }
-      return str.getBytes(Protocol.CHARSET);
-    } catch (UnsupportedEncodingException e) {
-      throw new JedisException(e);
+    if (str == null) {
+      throw new IllegalArgumentException("null value cannot be sent to redis");
     }
+    return str.getBytes(Protocol.CHARSET);
   }
 
   public static String encode(final byte[] data) {
-    try {
-      return new String(data, Protocol.CHARSET);
-    } catch (UnsupportedEncodingException e) {
-      throw new JedisException(e);
-    }
+    return new String(data, Protocol.CHARSET);
   }
 
   /**