RE: Best Practices?

[Andrew Premdas]

Title: RE: Best Practices?

Luciano,

 

What format is it in? (Web, Document)

Would you be willing to contribute it to the wiki?

 

If you send it to me (point me to it) I'd be happy to read and review it.

 

all best

 

Andrew

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 13 May 2004 15:49
To: [EMAIL PROTECTED]
Subject: RE: Best Practices?

Hi Andrew,
I started to write a tutorial on how to create a web service using Axis and Ant.
The tutorial is also taking in consideration attachments and I believe it
would fit into a Axis beginners page.

Luciano

-----Original Message-----
From: Andrew Premdas [mailto:[EMAIL PROTECTED]]
Sent: Thursday 13 May 2004 15:58
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: Best Practices?

Yes otherwise I wouldn't have posted. However I have

1) Little knowledge
2) Not a great deal of time (day job too)

So I'm happy to

1) Review any documentation that is newbie orientated
2) Create a newbie pathway.

My initial thoughts are to create a newbie trails page on the wiki and start
from there.

Comments?

-----Original Message-----
From: Davanum Srinivas [mailto:[EMAIL PROTECTED]]
Sent: 13 May 2004 14:06
To: [EMAIL PROTECTED]
Subject: Re: Best Practices?

Next question: Are u willing to help? As u know all committers have day jobs
:)

thanks,
dims

On Thu, 13 May 2004 10:43:09 +0100, Andrew Premdas
<[EMAIL PROTECTED]> wrote:
>
> My 2c as a newbie.
>
> No.1 thing for a better Axis - much better documentation!!
> No.2 thing, better ease of use
>
> For a newbie, Web Services and Axis are something of a minefield, through
> which there are no clear marked paths. The docs sell .jws when really all
> its good for is persauding people web services are much easier than they
> actually are ... was going to list other faults of docs but instead ...
>
> How to improve docs:
>
> Provide a number of real world scenarios that clearly illustrate the
> development of production quality web services. Start with something
simple
> and then move on from there. Explain why things are being done in a
certain
> way.
>
>   StockQuote, ServiceSendingAttachment, ServiceSendingComplexType ...
>
> Provide examples of different ways of working with Axis and explain their
> merits
>
>   jws, interface -> java2wdsl -> wsdl2java, wsdl by hand, wsdl2java,
>
> Explain clearly key web services issues
>   xml-oo mismatch, ...
>
> Provide a number of clear paths through these areas, perhaps following a
> format like the java tutorial.
>
> How to improve ease of use:
>
> Improve, or at the very least clearly document the command line interface
> tools - wsdl2java, java2wsdl. Document the ant tasks and provide good
> examples of usage. Provide default log4j configurations inbuilt into the
> command line tools, so if they can't find a properties file on the command
> line they will at least log to the console. Perhaps add a command line
> switch (oh no another one) to set logging level.
>
> None of this is particularly glamorous, but the reason this thread started
> is because much of this doesn't exist and people need clearer guidance
about
> how to get the best out of Axis.
>
> All best
>
> Andy
>
> Andrew Premdas
> Student Systems Developer
> Manchester University
>
> -----Original Message-----
> From: Davanum Srinivas [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, May 12, 2004 1:14 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Best Practices?
>
> Let's twist this discussion on its head....
> - Is there a list of bugs hiding in there somewhere? (bug reports)
> - What would you do if you were to write/re-write parts of axis?
> (enhancements requests)
>
> If we can't create new bug reports / enchancements to tell axis
> developers how axis should behave in the future (1.2 Final) then all
> discussion is just water under the bridge.
>
> thanks,
> -- dims
>
> On Wed, 12 May 2004 12:12:44 -0500, Joe Plautz <[EMAIL PROTECTED]>
wrote:
> >
> > Thanks for the advice! This is exactly what I've been looking for.
> >
> > It almost seems that people end up using Axis inspite of itself. But,
it's
> > just too dang easy to get something up and running. I imagine JWS files
> have
> > lead many people astray with their simplicity. If all services could
work
> > like them, plus using user defined objects/type with little to no
> > configuration. The world would be a fabulous place.
> >
> > I too have been not tying my service layer to my DAO layer. My reasons
are
> > more personal preferrance then need. But, I can take my DAO and put it
> > behind something else with little changing except creating a new broker.
> >
> > -Joe
> >
> >
> >
> > ----- Original Message -----
> > From: "Anderson Jonathan" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Wednesday, May 12, 2004 10:03 AM
> > Subject: RE: Best Practices?
> >
> > > I would venture to say that 80% of the complications and frustrations
> > > implementing interoperable (WS-I compliant Doc/Literal) SOAP web
> services
> > on
> > > Java platforms stem from the XML datatype to Java datatype binding
> > problem.
> > >
> > > If you take the time to learn W3C XML Schema, you'll see the problem:
> it's
> > > not an OO type system.  Therefore modeling your data types in Java and
> > > expecting some automagic Java2WSDL utility to do all of the hard work
to
> > > generate your XML schema is naive, and it is unfortunate that so many
OO
> > > developers think this way.
> > >
> > > I've encountered several approaches for dealing with this problem with
> > > Axis - virtually all of them involve hand crafting your WSDL and XSD
> (with
> > a
> > > WSDL/XSD IDE, of course) and generating a Java type system using ***a
> > > particular Java XML binding engine***.  Using Axis's internal XML
> binding
> > > engine is one of several options available to you.
> > >
> > > For more info on the XML binding problem in Java, I defer to Dennis
> > Sosnoski
> > > (www.sosnoski.com), a long-time XML deep thinker.  He first turned me
> onto
> > > the XML data binding "problem" with his excellent articles (4 parts)
on
> > the
> > > issues over at IBM developerWorks.
> > >
> > > http://www-106.ibm.com/developerworks/library/x-databdopt/index.html
> > >
> > > If you're trying to use Axis's internal XML binding engine, here's
some
> > > advice:
> > >
> > > http://marc.theaimsgroup.com/?l=axis-user&m=107945370506044&w=2
> > >
> > > We've since moved away from this approach, and are currently using
> Axis's
> > > Message Style services to pass the SOAP Request Body DOM straight to
> > Castor,
> > > which unmarshalls the XML into a Castor generated type system.  We
> further
> > > introduced a broker pattern to abstract the SOAP messaging layer from
> our
> > > business layer, which currently is not tied to any XSD generated
types.
> > >
> > > Axis Message Style Service Implementation ->
> > > Service Broker Layer (unmarshalls SOAP Request DOM via Castor,
extracts
> > the
> > > necessary information from Castor types - literally traversing the
> graph's
> > > getters - to invoke Business Manager Layer, and catches Business
> > Exceptions
> > > and maps them to proper SOAP Faults using AxisFault)->
> > > Business Manager Layer (not tied to XSD types, but rather pure Java
> > business
> > > domain types, invokes DAO layer as needed) ->
> > > DAO Layer (a Spring/Hibernate layer to manage persistence for business
> > > domain types)
> > >
> > > The problem here is definitely managing and translating between the
two
> > type
> > > systems: Castor generated classes from XSD and non-generated Business
> > Domain
> > > classes.
> > >
> > > The alternative, however, is to just try to use the XSD generated type
> > > system and persist that directly.  This is too big of a leap for us
> right
> > > now, as our business layer doesn't "think" in pure XSD type terms.
> You'll
> > > probably encounter this a lot given how much legacy functionality
people
> > are
> > > trying to SOAP service enable.
> > >
> > > Bottom line: implementing a WS-I compliant SOAP service in Java is not
a
> > > trivial thing.  There are two types of people building Web Services in
> > Java:
> > > those who are extremely frustrated with the completely stupid state of
> the
> > > Java based Web Services world right now and yet still trying very hard
> to
> > do
> > > it right, and those who haven't grasped that world is in a completely
> > stupid
> > > state right now.
> > >
> > > -Jon
> > >
> > > -----Original Message-----
> > > From: Joe Plautz [mailto:[EMAIL PROTECTED]]
> > > Sent: Wednesday, May 12, 2004 10:02 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: Best Practices?
> > >
> > >
> > > My first attemps have started with a WSDL/Schema then I generate
> > everything.
> > > I was able to find an example at W3.org and I just manipulate it to
the
> > way
> > > I need it. I thought this to be the best way at the time because of
> > > interoperability.
> > >
> > > From what I've been finding thus far there are no "Standard"
practices,
> > just
> > > "Accepted" practices. Starting with a class then using Java2WSDL and
> then
> > > WSDL2Java seems to be the most common. But, it almost seems that this
> was
> > > not the intention of the designers of Axis. Why use two steps when you
> can
> > > use one? Creating a WSDL from scratch seems like the intended way, but
> is
> > > not the most accepted way by the developers/users of Axis. Why write
> what
> > > you can generate?
> > >
> > > I know this isn't difficult earth shattering stuff, I'm just looking
for
> > the
> > > best way of doing this. So, when I start working with other people to
> > create
> > > services, we're doing it the "right" way.
> > >
> > > ----- Original Message -----
> > > From: "Dorner Thomas" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Wednesday, May 12, 2004 7:01 AM
> > > Subject: AW: Best Practices?
> > >
> > >
> > > You are right - if you will do a interoperable webservice
> > > that deal with other clients (.Net ...) its better to go from the
> > > wsdl.
> > >
> > > But when i use String, int and so on and i generate a wsdl by
> > > java2wsdl, I hope the wsdl i get, depends on the standard spec.
> > > for wsdl!????
> > >
> > > So there should no problem to use the wsdl by other languages!???
> > >
> > > Dont know how it looks with complex datatypes!????
> > >
> > > Do you all write your own wsdl by hand????
> > >
> > > Tomi
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von: David Cunningham [mailto:[EMAIL PROTECTED]]
> > > Gesendet: Mittwoch, 12. Mai 2004 13:14
> > > An: [EMAIL PROTECTED]
> > > Betreff: RE: Best Practices?
> > >
> > >
> > > I disagree, the right way is to start with your WSDL and schema files.
> If
> > > you want any hope of being WS-I compliant or using doc/literal this is
> > your
> > > best bet. As soon as you start with an interface, you start dealing
Java
> > > types that do not correlate to schema types very well. For example, if
> you
> > > use: public List getStuff() or public String[] getStuff(), you will
> either
> > > generate a WSDL file that can't be parsed properly by other consumers
> > (.NET,
> > > Glue, etc) or be bound to Java collection types that have no chance of
> > being
> > > parsed properly by .Net (without a lot of hacking around).
> > >
> > > My recommendation, again personal preference, is always give thought
to
> > the
> > > XML that is going across the wire and what you are trying to
> send/receive
> > > and in what structure. This is especially important when dealing with
> > > doc/literal since you are sending a single document over the wire.
> > >
> > > - david
> > >
> > > -----Original Message-----
> > > From: Dorner Thomas [mailto:[EMAIL PROTECTED]]
> > > Sent: Wednesday, May 12, 2004 2:03 AM
> > > To: '[EMAIL PROTECTED]'
> > > Subject: AW: Best Practices?
> > >
> > > The right way is to write a interface which includes all the Methods
> your
> > > webservice should offer.
> > >
> > > Then you use java2wsdl to generate your wsdl. You have to correct your
> > > parameternames in your auto generated wsdl, cause the the params looks
> > like
> > > in0, in1, in2... .
> > >
> > > Then you use wsdl2java to generate your stub, locator, skeleton, impl
> and
> > > maybe a testclient.
> > >
> > > Now you can implement and deploy your Service by unsing the addtional
> > > generated .wsdd files.
> > >
> > > Hope this helps you
> > >
> > > Tomi
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von: Joe Plautz [mailto:[EMAIL PROTECTED]]
> > > Gesendet: Dienstag, 11. Mai 2004 18:48
> > > An: [EMAIL PROTECTED]
> > > Betreff: Best Practices?
> > >
> > >
> > > I'm a newbie looking for guidance in creating WebServices with Axis.
> I've
> > > gone through the documentation backwards and forwards and have come up
> > with
> > > me own ways of doing things. I start with a WSDL that I create and use
> > > WSDL2Java to generate the code and go from there. What I'm looking for
> is
> > a
> > > best practices because I don't feel confident in the way I am going
> about
> > > it.
> > >
> > > Do most people start from a WSDL? Do people generate a WSDL from an
> > > interface and go from there? Do people just create a class and a WSDD
> > file?
> > > Or, do people use JWS files that accept a string and the string
contains
> > xml
> > > formated text?
> > >
> > > If there are any sites that cover this information, please forward
them
> on
> > > to me.
> > >
> > > Any help will be appreciated!!!
> > >
> > > Thanks,
> > > Joe Plautz
> > > [EMAIL PROTECTED]
> > >
> > >
> > >
> > >
> > >
> >
> >
>
>

 

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