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From "Anne Thomas Manes" <a...@manes.net>
Subject RE: help required for attachment using ejb as webservice
Date Wed, 07 May 2003 15:25:39 GMT
There's no standard extension to WSDL 1.1 for describing attachments.

> -----Original Message-----
> From: Ekbote, Niranjan [mailto:NEkbote@doubleclick.net]
> Sent: Wednesday, May 07, 2003 11:16 AM
> To: 'axis-user@ws.apache.org'
> Subject: RE: help required for attachment using ejb as webservice
>
>
> Hello,
> 	How would WSDL2Java know when to use/expect attachments from the
> WSDL. I am new to WSDL, but does WSDL explicitly even support
> attachments? I
> know you can specify MIME parts in the WSDL. But does that
> necessarily mean
> attachments?
>
> Thanks!
>
> -- Niranjan.
>
>
> -----Original Message-----
> From: Tom Jordahl [mailto:tomj@macromedia.com]
> Sent: Wednesday, May 07, 2003 11:05 AM
> To: 'axis-user@ws.apache.org'
> Subject: RE: help required for attachment using ejb as webservice
>
>
> > In general, WSDL2Java does not have any attachment support at all.
>
> Sure would be nice to have though, right?  Anyone interested in taking on
> this implementation task?
>
> "Without participation, Open Source Software will not succeed."
>
> --
> Tom Jordahl
> Macromedia Server Development
>
> -----Original Message-----
> From: Ekbote, Niranjan [mailto:NEkbote@doubleclick.net]
> Sent: Wednesday, May 07, 2003 9:19 AM
> To: 'axis-user@ws.apache.org'
> Subject: RE: help required for attachment using ejb as webservice
>
> Hi,
> 	We experienced the same exact problem. We need to transfer files. We
> too are exposing our stateless session EJBs as webservices. Now you CANNOT
> have a DataHandler object returned by an EJB and consumed by some
> other user
> directly accessing the EJB because it does not implement the
> java.io.Serializable interface. So to have an EJB which returns a
> DataHandler object is basically useless from purely the J2EE perspective
> because it is invariable going to throw an exception. However,
> Axis supports
> attachments using the DataHandler object. So this is kind of a paradox. So
> there is no way to expose an EJB directly as an Axis web service
> which deals
> with DataHandler attachments. The way we worked around this was to have a
> general simple class (not an EJB) which we exposed as a web service. Now
> since this class is not an EJB it can return DataHandler objects. Now the
> implementation of this class, can call the EJB using JNDI, get
> the data as a
> byte array or some java.io.Serialzable object which EJB can return safely
> then encapsulate it in a DataHandler object and return it, which Axis then
> sends as an attachment.
>
> However, even then the WSDL automaticalluy generated by Axis in for
> DataHandler return types is totally usely when used with WSDL2Java. In
> general, WSDL2Java does not have any attachment support at all.
>
> Thanks!
>
> -- Niranjan.
>
>
> -----Original Message-----
> From: subhendukumar mohanty [mailto:subhendukm@infosys.com]
> Sent: Wednesday, May 07, 2003 9:04 AM
> To: axis-user@ws.apache.org
> Subject: RE: help required for attachment using ejb as webservice
>
>
>
> Thanks Toshi,
>
> I got your mail regarding the sample example. My return type bean is
> serializable. but it's data member is not serializable. I can try this but
> it will not solve my requirement as we have to return more image
> with there
> meta data . So it has to be wrapped by custom object.
>
> Let me know if you have more idea.
> Thanks,
> Subhendu
>
>
> -----Original Message-----
> From: Toshiyuki Kimura [mailto:kimuratsy@nttdata.co.jp]
> Sent: Tuesday, April 08, 2003 12:10 AM
> To: axis-user@ws.apache.org
> Subject: RE: help required for attachment using ejb as webservice
>
>
> Hi Subhendu,
>
>   Please show us the snippet of the ejb code and the stacktrace
> of the exception.  And I have no trouble with my environment;
> axis 1.1 rc2 on WebLogic 7.0 SP1.  If it's possible to you,
> could you check the behavior of your ejb on the same env. ?
>
> 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: Saturday, April 05, 2003 2:24 AM
> To: axis-user@ws.apache.org; Toshiyuki Kimura
> Subject: RE: help required for attachment using ejb as webservice
>
> Yes if i am not making this as ejb then it is ok. The only problem
> is with ejb
>
> -----Original Message-----
> From: Toshiyuki Kimura [mailto:kimuratsy@nttdata.co.jp]
> Sent: Friday, April 04, 2003 12:08 PM
> To: axis-user@ws.apache.org
> Subject: Re: help required for attachment using ejb as webservice
>
> Hi Subhendu,
>
>   Could you make sure that you have the right setting
> of the serializer for a DataHandler on wsdd ?  And one
> more question, are you successful with a non-ejb impl ?
>
> Best Regards,
>
>    Toshi (Toshiyuki Kimura) <kimuratsy@nttdata.co.jp>
>    R&D Headquarters
>    NTT DATA Corporation
>
> ----- Original Message -----
> From: "subhendukumar mohanty" <subhendukm@infosys.com>
> To: <axis-user@ws.apache.org>
> Sent: Friday, April 04, 2003 10:36 PM
> Subject: RE: help required for attachment using ejb as webservice
> >
> > 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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