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From "Amila Suriarachchi" <amilasuriarach...@gmail.com>
Subject Re: Axis2 article with databinding comparison
Date Thu, 02 Aug 2007 08:06:16 GMT
On 8/1/07, Dennis Sosnoski <dms@sosnoski.com> wrote:
>
> Hi Amila,
>
> Perhaps you should just write your own article comparing the data
> binding frameworks for use in Axis2. I've already made considerable
> changes to mine after our initial discussions in order to portray ADB in
> the best possible light, based on the as-yet unreleased Axis2 1.3 code.
>
> I've made it very clear in the article that the current JiBX code does
> not do a good job on code generation from schema, starting out the
> section on JiBX with: "/JiBX (which I also developed) is a data-binding
> framework that's mainly focused on working with existing Java classes
> rather than code generation from schema. With JiBX, you first create a
> binding definition to define how Java objects are to be converted to and
> from XML, then compile that binding using a tool that enhances your data
> class files by adding methods (as bytecode) implementing the
> conversions./" and later "/The biggest downside to the JiBX binding
> approach, at least in Web service terms, is probably that JiBX currently
> provides weak support for working from an XML schema definition. Even
> this weak support for working from schema, in the form of the Xsd2Jibx
> tool, isn't integrated into the Axis2 WSDL2Java code generation. This
> means that you need to have your Java data classes and binding
> definition created before you can run WSDL2Java to generate the Axis2
> linkage code./"


Ok now I think we are quite clear what ADB, jibx and other  databinding
framworks (xmlbeans,jaxbri) do and their
pros and crons for each situation.

Amila.

I'm not really sure what else you're looking for, unless it's an
> in-depth discussion of start-from-code vs. start-from-WSDL (which I also
> cover in the article, but only briefly due to the amount of other
> content). Your "Contract and code first then map" alternative is
> theoretically possible with JiBX, but extremely cumbersome, and as far
> as I know the bulk of Axis2 JiBX users are either starting from code and
> using the strong support provided by JiBX in this area or starting from
> WSDL and using the currently weak support for code+binding generation
> from schema.
>
>   - Dennis
>
>
> Amila Suriarachchi wrote:
> > hi dennis,
> >
> > thanks for your reply. As  I learned from the this discussion this is
> > what I can summarize about Axis2 data binding.
> >
> > Basically we have three approaches in Axis2 for Data binding.
> >
> > 1. Contract first.
> >    Here the objective is to generate the code only using wsdl (i.e.
> > giving some parameters to wsdl2java tool) without using any existing
> > classes.
> >   Alternatives.
> >   Use WSDL2java with
> >  i. ADB databinding.
> >       Fast and lightweight
> >       Have better MTOM support
> >       About 90% of schema coverage.
> >  ii. XMLBeans databinding
> >       100% schema coverage.
> >  iii. Jaxbri databinding
> >      100% schema coverage.
> >      use standard Java API
> > iv. jibx data binding with Xml Schema Codegen.
> >     Has less schema coverage compare to other frame works. (But
> > expected to grow in feature Axis2      releases).  As a result of
> > this, currently for a person chose this way first three alternatives
> > provide better support.
> >
> > 2. Code first approach.
> >    Here the objective is to deploy the existing POJOs as a web
> > service. So used framework should generate the WSDL.
> >  Alternatives.
> >  i. java2WSDL
> >  ii. jibx2WSDL
> >
> >   I have no sufficient knowledge about these two to give a comparison.
> > But deepal and dennis may provide.
> >
> > 3. Contract and code first then map
> >   Here the User starts with both WSDL and java classes. And main
> > objective is to map the WSDL schema elements to existing java beans.
> >
> >   Only wsdl2java tool with jibx data binding supports this option.
> >
> > Dennis would you agree with me about this summary?
> >
> > So When talking about your article It would be nice if you give this
> > picture as it is to the user. But it try to compare ADB, Xmlbeans and
> > jibx with out clearly defining the context. ( i.e the user approach
> > code first, contract first or both and them map).
> >
> > thanks
> > Amila.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > On 7/31/07, *Dennis Sosnoski * <dms@sosnoski.com
> > <mailto:dms@sosnoski.com>> wrote:
> >
> >     Hi Amila,
> >
> >     Amila Suriarachchi wrote:
> >     > ...
> >     > you have said.
> >     > With JiBX, you first create a binding definition to define how
> Java
> >     > objects are to be converted to and from XML, then compile that
> >     binding
> >     > using a tool that enhances your data class files by adding
> >     methods (as
> >     > bytecode) implementing the conversions.
> >     >
> >     > is this means it is mandatory to have data bind java classes
> written
> >     > and the binding file before calling to the wsdl2java tool?
> >     (according
> >     > to the current axis2 trunk code base)
> >
> >     Yes, that's correct.
> >
> >     >
> >     > in other way if you have a wsdl, is it possible to generate the
> code
> >     > using jibx, just giving some arguments to the wsdl tool? for ADB
> >     yes.
> >     >
> >     > According to your article the answer I understood is no. (my
> >     apologies
> >     > if I am wrong).
> >
> >     Yes, that's also correct. As stated in the summary: "But the JiBX
> >     support integrated into Axis2 doesn't handle code generation from
> >     schema, and even the separate code generation from schema support
> >     provided by the JiBX tools currently provides only limited schema
> >     support."
> >
> >     >
> >     > So when considering this fact there is no difference between ADB
> >     and
> >     > jibx for small wsdls. But what for large ones? users have to go
> >     > through the wsdl and schema files and write java classes and the
> >     > binding file. (Do you have a tool to generate the binding
> >     file?). And
> >     > on the other hand users must have and expert knowledge about
> Schema
> >     > and wsdl to read them and produce java files.
> >     >
> >     > This clearly shows ADB and jibx try to solve different kind of
> >     > problems. hence selection must be based on the user requirement
> >     rather
> >     > than the pros and crons of the frameworks.
> >
> >     That's why I say that ADB provides good - and growing - support
> >     for code
> >     generation from schema, while clearly stating that JiBX does not.
> >
> >     >
> >     > Lets say, there is an web service published and some one wants to
> >     > access this service.
> >     >
> >     > ADB scenario.
> >     > if he do not have any classes written and want to generate every
> >     thing
> >     > from the scratch (i.e only giving some arguments to wsdl2java
> tool)
> >     > adb is the only option. (of course xmlbeans and jaxbri can be used
> >     > alternatively)
> >     >
> >     > jibx Senario,
> >     > if he has written some java classes and want to map the incoming
> xml
> >     > stream to these classes only option is jibx.
> >     >
> >     > When considering above case, comparing jibx and ADB is useless.
> >     since
> >     > advantage of one is disadvantage of other since these two try to
> >     > address different problems.
> >
> >     "It's great that Axis2 offers a choice between these data-binding
> >     frameworks, because there's no single best choice for all needs."
> >
> >     >
> >     > On the other hand if you think of main two methods commonly used
> in
> >     > developing web services are.
> >     > 1. contract first approach.
> >     >     i.e first we develop wsdl and them generate code accordingly.
> >     > (ADB,xmlbeans jaxbri fallen into this categories)
> >     >
> >     > 2. code first.
> >     >    i.e we have java services written and want to publish them as
> web
> >     > services. java2wsdl address this scenario.
> >     >
> >     > For jibx I think it is in between. it is something like contract
> >     > first, code first and then map.
> >     > I agree you with that this is also a new approach option.
> >
> >     Through the Jibx2Wsdl tool JiBX provides excellent support for a
> >     code-first approach to service development, far superior (at least
> >     from
> >     my experience) to Java2Wsdl. It does not currently provide good
> >     support
> >     for code generation from schema, as discussed in the article and
> >     repeated above. I'm actually working on that area now, and in a
> >     month or
> >     so expect to provide quality code and binding generation from
> >     schema. I
> >     don't know whether that support will ever be integrated into the
> >     Axis2
> >     Wsdl2Java tool, because I find Wsdl2Java very difficult to work
> with.
> >
> >     I thought this was all clearly spelled out in the article,
> especially
> >     the Summary at the end. Hope this makes things clearer.
> >
> >       - Dennis
> >     >
> >     > please correct me I have misunderstood any thing.
> >     >
> >     > Thanks,
> >     > Amila.
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
> >     > On 7/28/07, *Dennis Sosnoski* < dms@sosnoski.com
> >     <mailto:dms@sosnoski.com>
> >     > <mailto:dms@sosnoski.com <mailto:dms@sosnoski.com>>> wrote:
> >     >
> >     >     The article has now been updated with the changes discussed
> >     in this
> >     >     thread and the one with Deepal. I'll add a link to the
> >     article in
> >     >     the docs.
> >     >
> >     >       - Dennis
> >     >
> >     >
> >     >     Dennis Sosnoski wrote:
> >     >     > Hi Amila,
> >     >     >
> >     >     > Amila Suriarachchi wrote:
> >     >     >>
> >     >     >>
> >     >     >> On 7/27/07, *Dennis Sosnoski* <dms@sosnoski.com
> >     <mailto:dms@sosnoski.com>
> >     >     <mailto:dms@sosnoski.com <mailto:dms@sosnoski.com>>
> >     >     >> <mailto: dms@sosnoski.com <mailto:dms@sosnoski.com>
> >     <mailto:dms@sosnoski.com <mailto:dms@sosnoski.com>>>> wrote:
> >     >     >>
> >     >     >>     My devWorks article comparing ADB, XMLBeans, and JiBX
> >     data
> >     >     binding
> >     >     >>     with
> >     >     >>     Axis2 has now been published:
> >     >     >>
> >     http://www.ibm.com/developerworks/webservices/library/ws-java3
> >     <http://www.ibm.com/developerworks/webservices/library/ws-java3>
> >     >     >>
> >     >     <
> http://www.ibm.com/developerworks/webservices/library/ws-java3
> >     >     <
> >     http://www.ibm.com/developerworks/webservices/library/ws-java3>> I
> >     >     >>     *am*
> >     >     >>     the primary developer for JiBX, but tried to give a
> fair
> >     >     >>     representation
> >     >     >>     of all three frameworks in the article. It also
> includes
> >     >     full sample
> >     >     >>     code, for both the current 1.2 release and the
> >     in-progress 1.3
> >     >     >>     release.
> >     >     >>
> >     >     >>
> >     >     >> First of all I would really thank you to writing this
> >     article,
> >     >     since
> >     >     >> this would help a new person to relay understand the
> >     things and
> >     >     >> getting started. And also It would be nice this article
> >     base on
> >     >     Axis
> >     >     >> 1.3 release.
> >     >     >
> >     >     > Thanks! Unfortunately, the article is based mainly on the
> 1.2
> >     >     release
> >     >     > since it was submitted for publication two months ago. I
> >     did update
> >     >     > the code to include samples for Axis2 1.3, and added a
> sidebar
> >     >     on the
> >     >     > ADB and XMLBeans sections discussing the problems which
> >     were present
> >     >     > in 1.2 (which I argued strongly in favor of correcting at
> >     the time
> >     >     > with a 1.2.1 release) but fixed in 1.3.
> >     >     >
> >     >     >>
> >     >     >> I would like to express my ideas regarding some of the
> >     things you
> >     >     >> have mentioned about the ADB.
> >     >     >>
> >     >     >> 1. On the down side, the ADB unwrapped support is still
> >     somewhat
> >     >     >> unstable
> >     >     >>
> >     >     >> see the wsdls in the these locations [1],[2] . I could
> >     generate the
> >     >     >> code for all wsdls
> >     >     >> (i.e doc/litwrap, doc/litbare, rpc/lit  Axis2 1.3 RC2)
> >     with ADB
> >     >     >> unwrapping and invoked sucessfully. So ADB fully support
> the
> >     >     >> unwrapping for all those scenarios.
> >     >     >
> >     >     > You're right, with the 1.3 release coming the comment
> >     about ADB
> >     >     > unwrapped support being somewhat unstable no longer applies.
> >     >     I'll ask
> >     >     > to have that removed from the Summary.
> >     >     >
> >     >     >>
> >     >     >> 2. ADB also offers some enhanced features not currently
> >     available
> >     >     >> with the other data-binding frameworks, including automatic
> >     >     >> attachment handling.
> >     >     >>
> >     >     >> better you would have included this part in conclusion as
> >     well.
> >     >     since
> >     >     >> this is a really distinguish feature.
> >     >     >
> >     >     > True for now, though I'm planning to add attachment
> >     handling for
> >     >     JiBX
> >     >     > soon. But I'll add this to the Summary.
> >     >     >
> >     >     >>
> >     >     >> 3. In the current Axis2 1.2 release, these limitations
> >     include
> >     >     schema
> >     >     >> features, such as compositors with
> >     |maxOccurs="unbounded"|, schema
> >     >     >> definitions with |attributeFormDefault="qualified"|, and
> some
> >     >     similar
> >     >     >> variations
> >     >     >>
> >     >     >> All these problems are solved in Axis2 1.3 RC2. ADB now
> >     supports,
> >     >     >> minOccurs, maxOcuurs full in Sequence and Chioce level and
> >     >     >> attributeFormDefault='qualified' as well.
> >     >     >> And also it has the follwing featues as well
> >     >     >> 1. Union,list, restriction (pattern,enumeration) type
> support
> >     >     >> 2. QName support to attributes and elements,
> >     >     >> 3. Complex type extensions hence polymorphysum
> >     >     >> 4. AttributeGroup, Group references support,
> >     >     >>
> >     >     >> if you come across any issues regarding these please log
> >     a jira.
> >     >     >
> >     >     > I added the sidebar as the article went to publication,
> >     stating
> >     >     that
> >     >     > the unwrapping issues have been corrected in Axis2 1.3.
> >     The article
> >     >     > was written before these problems were corrected, and it's
> >     too much
> >     >     > effort for me to completely rewrite it based on the 1.3
> >     code - but
> >     >     > even now the 1.2 release is the latest full release
> available.
> >     >     >
> >     >     >>
> >     >     >> 4, ADB code is usable only for Axis2 Web services
> >     >     >>
> >     >     >> Although it is not impossible to use ADB in ther web
> >     services (You
> >     >     >> can run the ADB generated code by adding axis2-adb.jar
> >     >     >> axi2-kernal.jar and AXIOM jars to class path. can create
> the
> >     >     ADB bean
> >     >     >> objects by parsing the stream reader to parse method and
> >     serialize
> >     >     >> using serilize method. please see[3]) this is not straight
> >     >     forward as
> >     >     >> other data binding frameworks like jibx,xmlbeans and
> jaxbri.
> >     >     >>
> >     >     >> On the other hand When someone choosing a databinding
> >     framwork
> >     >     to use
> >     >     >> with axis2 this should not be an issue.
> >     >     >
> >     >     > I agree - so presumably you don't object to my saying that
> >     "ADB code
> >     >     > is usable only for Axis2 Web services", right? :-)
> >     >     >
> >     >     >>
> >     >     >>
> >     >     >> Anyway if you do some Axis2 traning (which is really good
> in
> >     >     >> promoting Axis2) better if you prefer to use Axis2 1.3
> >     (which will
> >     >     >> release soon) rather than Axis2 1.2. Axis2 will provides
> >     better
> >     >     full
> >     >     >> stack support (i.e security, RM and addressing) with
> relevant
> >     >     Rampart
> >     >     >> and sandesha modules and other features than Axis2 1.2.
> >     >     >> So using Axis2 1.3 would give a better user impression
> >     regarding
> >     >     >> Axis2 than Axis2 1.2 which is good for Axis2.
> >     >     >
> >     >     > I agree completely, and I've already revised my sample
> >     code to work
> >     >     > with 1.3. I did have bad experiences trying to use 1.2 for
> >     training
> >     >     > purposes, since (1) many of the features I used in my
> >     samples were
> >     >     > broken, as discussed in the article, and (2) the lack of
> >     Rampart
> >     >     > support for weeks following the 1.2 release meant no
> >     WS-Security
> >     >     > handling could be demonstrated. I ended up using 1.1.1 for
> >     >     classes in
> >     >     > April and May because of these issues. Fortunately, 1.3
> >     looks like
> >     >     > it'll be much more solid than 1.2 - it's done well with
> >     everything
> >     >     > I've tried so far, though I haven't tested WS-Security
> >     handling with
> >     >     > the current Rampart builds yet.
> >     >     >
> >     >     >  - Dennis
> >     >     >
> >     >     >>
> >     >     >> thanks,
> >     >     >> Amila.
> >     >     >>
> >     >     >> [1]
> >     >     >>
> >     >
> >
> http://131.107.72.15/SoapWsdl%5FBaseDataTypes%5FXmlFormatter%5FService%5FIndigo/
> >     >     >>
> >     >     >> [2]
> >     >     >>
> >     >
> >
> http://131.107.72.15/SoapWsdl%5FComplexDataTypes%5FXmlFormatter%5FService%5FIndigo/
> >     <
> http://131.107.72.15/SoapWsdl%5FComplexDataTypes%5FXmlFormatter%5FService%5FIndigo/
> >
> >     >     >> <
> >     >
> >
> http://131.107.72.15/SoapWsdl%5FComplexDataTypes%5FXmlFormatter%5FService%5FIndigo/
> >     >
> >     >     >>
> >     >     >> [3] http://wso2.org/library/2068
> >     >     >>
> >     >     >>
> >     >     >>     While I'm promoting my own stuff, I'll also mention
> >     that I'm
> >     >     >>     planning a
> >     >     >>     trip to Australia in early September for on-site
> >     consulting and
> >     >     >>     training
> >     >     >>     visits (see the Axis2 training course outline:
> >     >     >>     http://www.sosnoski.com/companys/axis2class.html),
> >     and will
> >     >     >> follow-up
> >     >     >>     with another trip to the U.S. later in the (northern
> >     >     hemisphere)
> >     >     >> fall.
> >     >     >>     Visits to other parts of the world can also be
> >     arranged...
> >     >     email me
> >     >     >>     directly if interested.
> >     >     >>
> >     >     >>       - Dennis
> >     >     >>
> >     >     >>     --
> >     >     >>     Dennis M. Sosnoski
> >     >     >>     SOA and Web Services in Java
> >     >     >>     Axis2 Training and Consulting
> >     >     >>     http://www.sosnoski.com - http://www.sosnoski.co.nz
> >     >     >>     Seattle, WA +1-425-939-0576 - Wellington, NZ
> >     +64-4-298-6117
> >     >     >>
> >     >     >>
> >     >     >>
> >     >     >>
> >     >
> >
> ---------------------------------------------------------------------
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> >     >     >>
> >     >     >>
> >     >     >>
> >     >     >>
> >     >     >> --
> >     >     >> Amila Suriarachchi,
> >     >     >> WSO2 Inc.
> >     >     >
> >     >     >
> >     >
> >
> ---------------------------------------------------------------------
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> >     >     >
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> >     >
> >
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> >     >
> >     >
> >     >
> >     >
> >     > --
> >     > Amila Suriarachchi,
> >     > WSO2 Inc.
> >
> >
> ---------------------------------------------------------------------
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> >
> >
> >
> >
> > --
> > Amila Suriarachchi,
> > WSO2 Inc.
>
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>


-- 
Amila Suriarachchi,
WSO2 Inc.

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