src/main/java/org/apache/commons/io/input/NullInputStream.java [315:329]:
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    public synchronized void reset() throws IOException {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.reset();
        }
        if (mark < 0) {
            throw new IOException("No position has been marked");
        }
        if (position > mark + readlimit) {
            throw new IOException("Marked position [" + mark +
                    "] is no longer valid - passed the read limit [" +
                    readlimit + "]");
        }
        position = mark;
        eof = false;
    }
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src/main/java/org/apache/commons/io/input/NullReader.java [300:314]:
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    public synchronized void reset() throws IOException {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.reset();
        }
        if (mark < 0) {
            throw new IOException("No position has been marked");
        }
        if (position > mark + readlimit) {
            throw new IOException("Marked position [" + mark +
                    "] is no longer valid - passed the read limit [" +
                    readlimit + "]");
        }
        position = mark;
        eof = false;
    }
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