How to Send Itext Generated PDF to Browser?

I am still attempting to figure out how to send an Itext generated pdf
Document to the browser.

I am looking at the following blog posting where someone is using jruby
and iText to create a pdf file and then sending it to the browser :

Unlike the above example I am using only ruby / on rails.

I would like to do precisely this in ROR and I can get to the second
last line of the above blog (that is I can generate the document and
even the toByteArray or byte[] ). As in the example:

    document.close // <<<--- I can get this document
    send_data String.from_java_bytes(m.toByteArray),
         :type=> "application/pdf", :dispostion=>"inline"
// I can call the toByteArray and get the array of bytes byte[]

but I dont know how to send_data to the browser with the document and
byetarraystream available.

I try to do a byte[].toString() and send that to send_data but when I
get byte[].toString() from the java classes I get an error :

No Class DefFoundError (org/bouncycastle/asn1/ASN1OctetString)

Where to go from here?

From the blog : Is there an equivalent to String.from_java_bytes in