Base64.getMimeDecoder().decode() throws IAE for a single non-base64 character

The spec
http://download.java.net/jdk8/docs/api/java/util/Base64.html
specifies for Mime decoder:

"All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation."

However this is not so if the string being processed contains a single non-Base64 character.

Please see the following sample

import java.util.Arrays;
import java.util.Base64;

public class SingleNonB64AlphCharNotIgnored {

    public static void main(String[] args) {

        for (String ignoredChar : Arrays.asList("#", "(", "!", "\\", "-", "_")) {
            try {
                final byte[] decodedBytes = Base64.getMimeDecoder().decode(ignoredChar);
                System.err.println("decodedBytes.length = " + decodedBytes.length);
            } catch (Exception e) {
                System.err.println(e + " thrown for '" + ignoredChar + "'");
            }
        }
    }

}


The output is:

java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '#'
java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '('
java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '!'
java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '\'
java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '-'
java.lang.IllegalArgumentException: Input byte[] should at least have 2 bytes for base64 bytes thrown for '_'


Exception is thrown not by all decoding methods - for example these two methods decode passed single non-base64 char to zero-size byte array as expected:

Decoder.decode(ByteBuffer src, ByteBuffer dst)
Decoder.wrap(InputStream is)



The following JCK testcase will fail due to this issue:

api/java_util/Base64/Decoder/index.html#MimeDec_NonBase64CharsIgnored[downToZero_singleChar]