How does this method give me a -61 Error?

Question

This is in an application I am using called Mirth, but it appears to be coming from inside an Apache Commons library from a method that checks if something is indeed Base64

Answer 1

It's likely an ArrayIndexOutOfBoundsException. The -61 is supposedly the index.

From http://kickjava.com/src/org/apache/commons/codec/binary/Base64.java.htm:

134     private  static boolean isBase64(byte octect) {
135         if (octect == PAD) {
136             return true;
137         } else if (base64Alphabet[octect] == -1) { // <---
138             return false;
139         } else {
140             return true;
141         }
142     }

Apparently the input isn't Base64 encoded.