result of jsonloader of pig script with bag is empty

Hi,

I'm using cdh5 quickstart vm and I have a file like this(not full here):

{"user_id": "kim95",
"type": "Book",
"title": "Modern Database Systems: The Object Model, Interoperability, and
Beyond.",
"year": "1995",
"publisher": "ACM Press and Addison-Wesley",
"authors": {},
"source": "DBLP"

{"user_id": "marshallo79",
"type": "Book",
"title": "Inequalities: Theory of Majorization and Its Application.",
"year": "1979",
"publisher": "Academic Press",
"authors": {("Albert W. Marshall"), ("Ingram Olkin")},
"source": "DBLP"

....

and i used this script:

books = load 'data/book-seded.json'
using JsonLoader('t1:tuple(user_id:
chararray,type:chararray,title:chararray,year:chararray,publisher:chararray,source:chararray,authors:bag{T:tuple(author:chararray)})');

STORE books INTO 'book-no-seded.tsv';

the script work , but the generated file is empty, do you have any idea ?

Uh..I forgot to say that I used cat to have all the file in one line(i
don't why, but the piece of file shown here didn't work in hue)

Thanks