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| | | J2EE packaging | J2EE packaging 2003-12-23 - By ashraf galal
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<P>What I want to say is JNDI is not alternative to class loading since class
loader is different from implementation to implementation.</P>
<P>also whatever you did or you can do to establish portability between
applications server you almost redo a lot of work and need experience in each
application server and you have to understand the class loading techniques for
every application server implementation <BR><BR></P><BR><BR><BR>
<DIV>Ashraf Galal <BR>(416)804-8359</DIV>>From: Katz Guy <GUY_KATZ@(protected)
.COM>>Reply-To: An interest list for Sun Java Center J2EE Pattern Catalog
<J2EEPATTERNS-INTEREST@(protected)>>To: J2EEPATTERNS-INTEREST@(protected)
>Subject: Re: J2EE packaging >Date: Tue, 23 Dec 2003 10:17:05 +0200 >
>hi; >your remarks are not very clear so I don't really understand what
you are >trying to say. but I will add the following: >1. what do you
mean don't worry about portability? - obviously you never had >to produce an
application that runs over more than one app server. packaging >your
application according to the recommendations and best practices will >get
you quite a long way to portability - using app server specific features >
;wont!. >2. J2EE classloading hierarchy is a subject that is not mandated by
the J2EE >spec. there are several recommendations but that's it. there is a
big hole >there and the result is a different classload
ing hierarchy for almost every >App server (allthough may share the same
logic). >thanks. > >-- --Original Message-- -- >From: ashraf galal
[mailto:ashrafwg@(protected)] >Sent: Tuesday, December 23, 2003 3:28 AM >
;To: J2EEPATTERNS-INTEREST@(protected) >Subject: Re: J2EE packaging > >
; > > > > > >To Katz Guy : > >Application servers are
totally different. so there is no need to wary about >portability between
them. > >class loader is J2EE specification used for packing and
deploying >applications while JNDI used for creating, adding, removing,
searching and >modifying directory objects. > >so I think this ides is
not valid. > > > > > > > > >Ashraf Galal >(416
)804-8359 > >From: Katz Guy >Reply-To: An interest list for Sun Java
Center J2EE Pattern >Catalog >To: J2EEPATTERNS-INTEREST@(protected) >
;Subject: Re: J2EE packaging > >Date: Sun, 21 Dec 2003 08
:09:40 +0200 > >Hi; >I think messing with the >classloaders
defaults is not a good idea. You will >eventually have >portability
problems cause the hierarchies are different >between app >servers.. >
;You should think of a more creative idea such as putting this >object >
(singleton) in the JNDI tree and access it from both apps >Also, >
;sometimes its not that bad to have two instances of your object (even > >
;though it's a singleton), especially if it holds read only data, if this >
>does not compromise your application logically, it will just cause some >
;form >of duplication in caching of data. > >-- --Original Message-- --
> >From: joe@(protected) [mailto:joe @(protected)] >Sent: Friday,
December 19, >2003 10:07 AM >To: J2EEPATTERNS-INTEREST@(protected) >
;Subject: Re: J2EE >packaging > > >Sachin, > >Your problem can
be solved by modifying your EAR >settings in WSAD. Like you &g
t;say, each war module has by default its own >classloader and is isolated
from >the rest of the application. This means >that calling ejb modules
from the >war is ok but calling one war from >another is not possible.
> >To allow calls into the war from another war, >you need to change
the War >classloader policy from MODULE to APPLICATION in >the Server
(WebSphere Test >environment) configuration. > >You find this in >
;the server perspective (I assume you use WSAD 5.x), from >the Server >
;Configuration view, select the test server you are running on and >open it.
>In the Applications tab at the far right of the configuration you >will
find >the Application Options. Select the EAR you are running and change >
;the War >classloader policy. > >Hope this solves your problem. >
>Best regards, >J�rn >�lmheim >SCEA >Statoil ASA > > >==
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