parameter become null in server side?

[Robinvane]

Hi,
I encounter the null issue in server side. Below is the code:
client side:
ClientResource cr = new ClientResource(Constants.TICKET_SOURCE_PATH);
TicketsResource tr = cr.wrap(TicketsResource.class);
retTicket = tr.store(ticket);

server side in Google app engine:
class DefaultTicketsResource  extends ServerResource implements TicketsResource 
{
  @Put
  public Ticket store(Ticket ticket) {
    // sometimes ticket is null, but it's non-null in client side
  }
}

Any insights? Does it relates to chunk encoding?

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