@madrob

ISO_8859_1

In the first version I used UTF_8 but later I checked the source code of java.util.Base64 ( http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/util/Base64.java ) and they are using ISO-8859-1 internally, so I thought to use the same.

public byte[] decode(String src) {
    return decode(src.getBytes(StandardCharsets.ISO_8859_1));
}

Probably we could use both character encodings, since base64 encoded strings only use a small subset of the characters.

encode decode

StandardCharsets.ISO_8859_1.decode(Base64.getEncoder().encode(bytes.wrapToByteBuffer())).toString());

First I base64 encode the ByteBuffer which gives me a ByteBuffer then I convert this ByteBuffer to String using Charsets decode ( https://stackoverflow.com/a/39845152 ). So it's an encode a decode but it's a different type of encoding/decoding.

Unfortunately, we can’t use the solution provided from stack overflow -http://apache.org/legal/resolved.html#stackoverflow

Can you contact the original author and ask for permission to use this? Otherwise we will need somebody who hasn’t looked this code to create a clean room implementation.

We also used a different way for String conversion, I modified the lines.