Martin,
Having looked through the mailing list archives a bit more closely I
noticed you indeed posted a very similar mail to mine some time ago
about all of this.
However there didn't seem to be any real conclusion at the end of it -
unless I missed it! Did you get around the problem in the end? If so,
could you tell me what you did.
For everyone: Is it, simply, the case that DataHandler in JAX RPC isn't
really designed for very large file transfer? In which case what is the
recommended way of transferring files? An obvious alternative is to
just use plain sockets to stream the file directly but this is not as
neat as just using the JAX RPC service for everything.
Many thanks for any help or pointers,
Ian.
-----Original Message-----
From: Martin Marinschek [mailto:martin.marinschek_at_gmail.com]
Sent: 15 December 2004 11:43
To: users_at_jax-rpc.dev.java.net
Subject: Re: DataHandler OutOfMemory problem
I was having the same problem - the answer so far was that the
datahandler stream is at some time read into some memory structure;
and therefore streaming is not entirely possible.
If there is any solution someone comes up with for that I would be
very interested, too!
regards
Martin
On Wed, 15 Dec 2004 11:15:29 -0000, Ian Jones <ijones_at_piper-group.com>
wrote:
>
>
>
> Hi all,
>
>
>
> I'm using a DataHandler to download a file from our server to a local
PC.
> This is working fine until the files get relatively large, e.g. I'm
> currently attempting to transfer a zipped up file that is about 30Mb,
and
> then I the client reports an OutOfMemory error.
>
>
>
> Here's a code snippet of the point in the code where the error is
occurring:
>
>
>
> logger.info("Requesting file");
>
>
>
> // ask for the file here
>
> DataHandler dh = client.getFile(filePath);
>
>
>
> logger.info("Got data handler");
>
>
>
> I get the first log message - "Requesting file" - and then the error.
So it
> is the retrieval of the DataHandler from the server, by calling
> client.getFile() above, that is causing the error. The getFile()
method on
> the server simply does this:
>
>
>
> public DataHandler getFile(String filename) throws RemoteException
{
>
> return new DataHandler(new FileDataSource(new
File(filename)));
>
> }
>
>
>
> I've increased the heap size of the java process running the client
and this
> stops the problem occurring. Is this the only way to stop this
happening?
> Or could I be doing something incorrectly to cause this problem? I
need to
> be able to deal with transferring files up to about 500Mb.
>
>
>
> Any help will be greatly appreciated.
>
>
>
> Ian Jones
>
> Senior Analyst Developer
>
> Piper Group plc
>
> Email: ijones_at_piper-group.com
>
> Tel: + 44 (0) 1454 284900
>
> Fax: + 44 (0) 1454 284950
>
> www.piper-group.com
>
>
>
> Information contained in this e-mail is intended for the use of the
> addressee only, and is confidential and may be the subject of legal
> professional privilege. Any dissemination, distribution, copying or
use of
> this communication without permission of the addressee is strictly
> prohibited. The views expressed in this communication may not
necessarily be
> the views held by Piper Group plc.
>
>
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