title: java.lang.NoMethodError : org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString
body: <p>I am getting the following exception in my web application:</p>
  
  <pre><code> java.util.concurrent.ExecutionException: java.lang.NoSuchMethodError:     org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString([B)Ljava/lang/String;
  </code></pre>
  
  <p>The commons-codec-1.5.jar is added in my classpath. I am building it using Ant and have added the dependencies manually. Through other discussions on the same issue I found out that adding the source of the this library can solve the issue but that didn't work for me. I also read that having another library with the same class can cause the conflict and possibly that class may not have this method which results in the error. However, I have double checked that there is no other version of the same library. Is it possible that some other library has the same class in it? If yes, then how can I identify that and resolve the problem? </p>