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From "subhendukumar mohanty" <subhend...@infosys.com>
Subject RE: help required for attachment using ejb as webservice
Date Fri, 04 Apr 2003 13:36:43 GMT
Thanks for your suggestion

Actually i had tried making a DataHandler as return type of EJB method. For the time being
think that there is no webservice. I wrote the sample ejb and run that sample and it gave
me nonserializable exception.That's why i could not use this. For ejb all the return type
has to extend Java.io.serializable.

Let me know if i am not correct

-----Original Message-----
From: Toshiyuki Kimura [mailto:kimuratsy@nttdata.co.jp]
Sent: Thursday, April 03, 2003 10:43 PM
To: axis-user@ws.apache.org
Subject: RE: help required for attachment using ejb as webservice


Hi Subhendu,

  You're incorrect.  You can't make it the return type in
ejb method.  Why not ?  I can do that.  I don't know why
you didn't try anyway ?

  I believe, you're confusing the meaning of the word;
'serialize' in the Web Services area with 'serializable'
in the general Java programming.
  The diff. of serialize/deserialize in the 2 areas are;

 WS area : [Program lang. specific objects] <-> [XML(SOAP)]
 Java gen: [Java objects] <-> [byte array]

  These are quite different, despite the misleading word.
Can you make sense of the meaning ?

Best Regards,

  Toshi (Toshiyuki Kimura) <kimuratsy@nttdata.co.jp>
  R&D Headquarters
  NTT DATA Corporation

-----Original Message-----
From: subhendukumar mohanty [mailto:subhendukm@infosys.com]
Sent: Friday, April 04, 2003 2:06 AM
To: axis-user@ws.apache.org
Subject: RE: help required for attachment using ejb as webservice

I have session bean. One thing i am not clear. If datahandler
is not a serializable , i can not make it the return type in
ejb method. Am i correct or not in the above statement ?

-----Original Message-----
From: Toshiyuki Kimura [mailto:kimuratsy@nttdata.co.jp]
Sent: Thursday, April 03, 2003 7:20 AM
To: axis-user@ws.apache.org
Subject: RE: help required for attachment using ejb as webservice

Hi Subhendu,

  At the beginning, I'd like to notify that I've already succeeded
in EJB usage with the AXIS 1.1 rc1 and the posted code.  Thus, it
seems the root problem is not the return type of an ejb method.

  The most interesting describes from you are the followings;

| Type of Image (Jpeg). We get the image as byte array from
|   other source. We do not get file reference.

  I guess that you're saving the jpeg images on DBMS, and also
the ejb is implemented as an Entity Bean.  Is that right ?
If so, the restriction of 'serializable' is for an Entity Bean
rather than for an ejb on AXIS.

Best Regards,

  Toshi (Toshiyuki Kimura) <kimuratsy@nttdata.co.jp>
  R&D Headquarters
  NTT DATA Corporation

-----Original Message-----
From: subhendukumar mohanty [mailto:subhendukm@infosys.com]
Sent: Thursday, April 03, 2003 12:07 AM
To: axis-user@ws.apache.org
Subject: RE: help required for attachment using ejb as webservice
provider

Hi Toshiyuki

My Answers are as below

Axis 1.0 (But we may go for Apache Soap latest version comes
 with websphere 4.0)
Type of Image (Jpeg). We get the image as byte array from other
 source. We do not get file reference.

Problem. If i expose my ejb method as webservice interface and
 i have to use soap with attachment then the return type of EJB
 method will be of Datahandler Type. But DataHandler can  not be
 return type of an ejb method as it does not implement
 java.io.serializable and all ejb retutn parameters needs to be
 serializable.

So to avoid this i was thinking that let my ejb return byte array
 and i have to write a wrapper java class which will convert the
 byte array to datahandler (still no clear how to convert that).
 The wrapper java class will be exposed as web service rather than
 exposing the ejb as webservice.

Let me know whethere i am procceding in a correct direction.

Thanks,
Subhendu

-----Original Message-----
From: Toshiyuki Kimura [mailto:kimuratsy@nttdata.co.jp]
Sent: Tuesday, March 25, 2003 6:27 AM
To: axis-user@ws.apache.org
Subject: Re: help required for attachment using ejb as webservice provider

Hi Subhendu,

  In order to clear questions from you, we'll need more details of
your situation;

  - Version of AXIS: 1.0, 1.1Beta, RC1, RC2, or the current ver ?
  - Type of Image  : 'JPEG', 'GIF', or the other specific types ?
  - Real problem   : 'Exceptions', or 'Functionally defectives' ?

  If you're using AXIS 1.1 Beta (or the later) and 'image/jpeg
or image/gif' as the content type (i.e. your image archive only
has JPEG files and/or GIF files), you might make it with the 
following snapshot;

public DataHandler downladFile(java.lang.String filename){
  try{
    FileDataSource dataSource = new FileDataSource(filename);
    DataHandler dataHandler = new DataHandler(dataSource);
    return dataHandler;
  }catch(Exception e){
      :
  }
}

  Please note DataHandler hasn't been implemented as serializable,
however, some standardized types of content (MIME type) will be
automatically serialized and deserialized by the runtime, AXIS
with your right configuration.

Best Regards,

  Toshi (Toshiyuki Kimura) <kimuratsy@nttdata.co.jp>
  R&D Headquarters
  NTT DATA Corporation

-----Original Message-----
From: subhendukumar mohanty [mailto:subhendukm@infosys.com]
Sent: Friday, March 21, 2003 10:05 AM
To: axis-user@ws.apache.org
Subject: help required for attachment using ejb as
         webservice provider

We are creating a ejb which will be exposed as webservice.
One of the method of ejb will return the image from image
archive. So we need to use soap with attachment for this.
I learned that if any data is returned using DataHandler
it will be automatically passed as soap with attachment.
As DataHandler is not implemented java.io.serializable,
I can not use this as the return type of the ejb. I am new
to webservice and axis. So any body can guide me what to do
in this case..

Your help will be appreciated.

Thanks,
Subhendu



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