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From "Xinjun Chen" <xjchen...@gmail.com>
Subject Re: [Axis2] AXIOM or JBIX
Date Thu, 29 Mar 2007 08:33:24 GMT
Hi Dennis,

I am trying to expose existing EJBs as web services. What I want to do is as
follows:
1. Receive an EJB Remote interface and the related domain object classes,
and generate data binder classes for the Remote interface methods.
2. Generate wsdl for the EJB Remote interface.
3. When receives SOAP Request from a client, I convert the XML message into
domain object using the binder classes and invoke an appropriate EJB with
the domain object. Since the remote EJB and domain objects are fixed, the
generated binder must do binding for the existing domain object class
(without modifying the domain object class since they will be used in rmi).
What's the data binding tool I should use?

Regards,
Xinjun


On 3/27/07, Dennis Sosnoski <dms@sosnoski.com> wrote:
>
> Good summary, José, but I'll add that even with manual binding
> definitions JiBX can't handle all aspects of schema correctly. Of
> course, that's also true of most data binding frameworks. XMLBeans was
> designed from the start to handle all of schema, and aside from some
> quirks and peculiarities it does so pretty well. But schema is a mess,
> and not all parts of it can be handled cleanly. The biggest downsides to
> XMLBeans for Java developers are that (1) many people find the generated
> data model API awkward to work with, (2) XMLBeans performance can be
> relatively poor (both in terms of time and memory usage), and (3) schema
> is being misused (especially in the web services world) in ways which
> AFAIK XMLBeans cannot handle.
>
> For (3), I'll point in particular at the use of "flexible"
> unmarshalling. What this means is taking the schema as a base, but then
> ignoring any elements which do not match the schema. This was the way
> most of the first- and second-generation web services frameworks
> operated, and some users now demand it. JAXB 2.0 operates this way by
> default (over my objections), and I added support for it in JiBX due to
> client requests. I personally think it's a bad way to go - why have a
> schema at all, if you're not going to enforce it? - but can see the
> appeal. It allows groups to use a common schema with ad hoc extensions
> for individual needs.
>
> JiBX was originally designed with the focus on providing fast and
> flexible conversions between XML and Java. Schema was an afterthought
> for JiBX, though it's become more of a driving force as developers using
> JiBX have wanted to support different parts of schema. But some aspects
> of schema are still not handled by JiBX, with type substitution probably
> the most important. Because the binding definitions used by JiBX were
> not designed with schema in mind there are also many things you can do
> with JiBX bindings which cannot be represented in schema.
>
> I'd like to improve JiBX support for schema in the future (not because I
> like schema - IMHO it's an ugly monstrosity that never should have been
> allowed to live - but because it's become impossible to avoid,
> especially in the web services world). Short-term that involves a
> replacement for the very outdated Xsd2Jibx tool that's currently the
> only way to generate code and bindings from schema. I've been working on
> a tool for this purpose, and should finally have an initial release in
> April. Long-term there are some structural changes required for JiBX
> which I've been hoping to do as part of a 2.0 rewrite of the JiBX code
> generation. The 2.0 rewrite is going to be a low priority unless I find
> a client who needs some of those features and is willing to pay for part
> of the development effort, so I don't currently have any scheduled
> completion date for that.
>
> - Dennis
>
> Dennis M. Sosnoski
> SOA and Web Services in Java
> Training and Consulting
> http://www.sosnoski.com - http://www.sosnoski.co.nz
> Seattle, WA +1-425-939-0576 - Wellington, NZ +64-4-298-6117
>
>
>
> José Antonio Sánchez wrote:
> > Not exactly. Xmlbeans can generate classes for every possible schema
> > automatically. JiBX only generates both classes and mapping
> > description for a limited set of schemas (for example, no xsd:anyType
> > is allowed). For that schemas you have to define the mapping manually.
> >
> > On 3/26/07, Josh <gemini929@gmail.com> wrote:
> >> Just for my own knowledge, is this a true statement?: "This is because
> >> XMLBeans implementation can understand all the XSD (i.e. schema)
> >> constructs."  Does JiBX have mapping limitations?
> >>
> >> Regards,
> >>
> >> Joshua
> >>
> >>
> >>
> >> On 3/26/07, Nilesh Ghorpade <nilesh_s_ghorpade@yahoo.com> wrote:
> >> >
> >> >
> >> >
> >> > Hi,
> >> >
> >> > As per my understanding AXIS 2 uses AXIOM API's internally for any
> XML
> >> related activities. Hence as you have mentioned that you are confused
> to
> >> choose between POJO, AXIOM, JIBX, ADB or XMLBeans, the AXIOM is an
> >> invalid
> >> option here.
> >> >
> >> > Secondly in AXIS 2 you can create web services using either the
> Spring
> >> Framework or POJO.
> >> >
> >> > JiBX, XMLBeans and ADB are more related to the data binding
> frameworks
> >> which AXIS 2 supports. Hence it depends on your schema on which data
> >> binding
> >> framework you would want to select. As per my knowledge XMLBeans is
> >> the best
> >> when it comes to complex schemas. This is because XMLBeans
> >> implementation
> >> can understand all the XSD ( i.e. schema) constructs.
> >> >
> >> > To answer your second question, the answer is YES. If you want to
> >> use the
> >> wsdl2java command from AXIS2 for generating your stubs and skeletons
> you
> >> will need the WSDL. Generating a WSDL is also not a diccficult task.
> >> YOu can
> >> have your SEI defined i.e. the Service Endpoint Interface with all the
> >> method signatures which you want to expose as web service operations.
> On
> >> executing the java2wsdl command from AXIS2 you would be able to get the
> >> WSDL. And using this WSDL you can generate the remaining artifacts of
> >> your
> >> web service. WSDL is nothing but an interface and hence even if you
> have
> >> defined an interface in Java, you can generate a WSDL from it.
> >> >
> >> >
> >> > Hope that answers your queries.
> >> >
> >> >
> >> > Regards
> >> >
> >> > Niles
> >> >
> >> > ----- Original Message ----
> >> > From: Martin Gainty < mgainty@hotmail.com>
> >> > To: axis-user@ws.apache.org
> >> >
> >> > Sent: Monday, March 26, 2007 3:15:01 AM
> >> > Subject: Re: [Axis2] AXIOM or JBIX
> >> >
> >> >
> >> > Anil-
> >> >
> >> > I found this whitepaper quite informative
> >> > SAX2 processes fastest..with DOM bein
> >> >
> >>
> http://www.mail-archive.com/jibx-users@lists.sourceforge.net/msg01044.html
> >>
> >> >
> >> > FWIW,
> >> > M--
> >> >
> >>
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> >> > ----- Original Message -----
> >> > From: "Anil" <vvnn_anil@yahoo.com>
> >> > To: < axis-user@ws.apache.org>
> >> > Sent: Sunday, March 25, 2007 4:37 PM
> >> > Subject: [Axis2] AXIOM or JBIX
> >> >
> >> >
> >> > > Hi,
> >> > >
> >> > > I'm new to Axis2, what is the criteria to choose
> >> > > between POJO, AXIOM, JIBX, ADB or XMLBeans. How do we
> >> > > decide architecture wise.
> >> > >
> >> > > My second question is, is wsdl file mandatory to
> >> > > create stub and skeleton interfaces or can we use just
> >> > > skeleton file to create wsdl file.
> >> > >
> >> > > Thanks.
> >> > >
> >> > >
> >> > >
> >> > >
> >>
> ____________________________________________________________________________________
> >>
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> >> > >
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> >> >
> >> >
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> >
> >
>
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