GUACAMOLE-736: Replace JAXB DatatypeConverter with Guava BaseEncoding.

extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/ticket/TicketValidationService.java

@@ -19,6 +19,7 @@
 
 package org.apache.guacamole.auth.cas.ticket;
 
+import com.google.common.io.BaseEncoding;
 import com.google.inject.Inject;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
@@ -28,7 +29,6 @@ import javax.crypto.Cipher;
 import javax.crypto.IllegalBlockSizeException;
 import javax.crypto.NoSuchPaddingException;
 import java.nio.charset.Charset;
-import javax.xml.bind.DatatypeConverter;
 import org.apache.guacamole.GuacamoleException;
 import org.apache.guacamole.GuacamoleServerException;
 import org.apache.guacamole.auth.cas.conf.ConfigurationService;
@@ -161,7 +161,7 @@ public class TicketValidationService {
             cipher.init(Cipher.DECRYPT_MODE, clearpassKey);
 
             // Decode and decrypt, and return a new string.
-            final byte[] pass64 = DatatypeConverter.parseBase64Binary(encryptedPassword);
+            final byte[] pass64 = BaseEncoding.base64().decode(encryptedPassword);
             final byte[] cipherData = cipher.doFinal(pass64);
             return new String(cipherData, Charset.forName("UTF-8"));