question: public static String base64EncodeByteArray ( byte [ ] bytes ) { try { byte [ ] encodeBase64 = Base64 . encodeBase64 ( bytes ) ; return new String ( encodeBase64 , "UTF-8" ) ; } catch ( Exception e ) { throw new RuntimeException ( "Exception while encoding bytes: " + Arrays . toString ( bytes ) ) ; } }
target:  base64 encode a byte array using org.apache.commons.codec.binary.Base64