@Override
    public String toString() {
        return "PooledByteBufferOutputStream{" +
               "pooledByteBuffer=" + ByteBufferUtils.byteBufferInfo(pooledByteBuffer.getByteBuffer()) +
               '}';
    }
Clears the underlying buffer if there is one.
stroom-bytebuffer/src/main/java/stroom/bytebuffer/PooledByteBufferOutputStream.java