Decode Base64 eMail body?

I found the code below on the B4J side, at the link below:

http://ift.tt/2btbgiL

I want to use this code to decode base64 in a B4A project. I see the notation that it requires Java 8. I have java 8 installed, yet I get the error - java.lang.ClassNotFoundException: java$util$Base64. I'm not sure whether this means B4A doesn't know Base64, or if there is something wrong with my B4A Paths. It seems odd that B4J passes this code...

Decode Base64 eMail body?

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