reading back, "type" : "bytes" from java via ByteBuffer

[sean jensen-grey]

I have a large sequence of pdfs stored in an avro file as part of a larger 
structure.

I have found a bug in my code where I was calling

    byteBuffer.array() to get back the byte[], this is incorrect as this is 
entire backing store and NOT the contents of the element stored in Avro.

How/where do I get the offset and the length of the ByteBuffer returned from 
Avro?

The convenience classes were generated via the maven plugin so my Record 
signature is

        MyRecord extends org.apache.avro.specific.SpecificRecordBase implements 
org.apache.avro.specific.SpecificRecord

The avro schema entry is

{
        "name" : "pdfs",
        "type" :  {  "type" : "array", "items": "bytes" }
}