Hi David,
my apologies for my tardiness with this response. I've been away from the
client site for a little while.
Our development team has put in place local Servlet and EJB containers that
can be run and debugged from the servlet code to EJB code within an IDE
environment ( we are using JDeveloper 3.2.3).
We are using:
- Jetty 4.0.5
- OpenEJB 0.8.1 (using IntraJVM)
- JVM 1.2.2 (from JDeveloper)
Initially when we attempted to setup the Jetty / OpenEJB dev environment,
we were getting errors when executing servlet code that was narrowing or
casting the Object returned from the JNDI lookup of an EJB. A suggestion
from the OpenEJB Forum (thanks Jacek) indicated it may be a classloader
problem. In the end it was a problem in the Jetty code. It allows for a
classpath to be specified for a HttpContext object that pointed at the
servlet classes. Removing this line of code from the Jetty Server resolved
the EJB lookup problem.
I've included a sample JettyServer.java source that simply creates a Jetty
HttpServer.
(See attached file: JettyServer.java)
When running this code, the classpath should include:
- OpenEJB libraries
- Jetty libraries
- EJB component code
- Servlet component code.
I haven't included sample servlet and ejb code, but this is relatively
straightforward. The OpenEJB components are used in IntraJVM mode.
Once all this is setup, its possible to run and debug both servlet and ejb
code end to end.
This configuration has helped provided our team with a useful local dev
environment.
Cheers,
Michael Mihaljevic
CMG IT Services.
Michael
Mihaljevic To: Michael Mihaljevic/Person/DOJ@DOJ
Sent by: cc:
Michael Subject: RE: [OpenEJB-user] OpenEJB and
Jetty
Mihaljevic
09/09/2002
14:48
----- Forwarded by Michael Mihaljevic/Person/DOJ on 09/09/2002 14:44 -----
Michael
Mihaljevic To: "David Blevins"
<[EMAIL PROTECTED]>
cc:
09/09/2002 Subject: RE: [OpenEJB-user] OpenEJB and
Jetty(Document link: Michael
14:48 Mihaljevic)
David,
sure, I'll post these details shortly.
Cheers, Michael
"David
Blevins" To:
<[EMAIL PROTECTED]>
<david.blevins cc:
@visi.com> Subject: RE: [OpenEJB-user] OpenEJB and
Jetty
Sent by:
"David
Blevins"
<david.blevins
@visi.com>
07/09/2002
03:19
Michael,
This is great news. This is information other OpenEJB users would
surely be interested in. Could you post some of the details on the user
list? Namely: what version of Jetty; what IDE and version; jdk version;
a few steps for getting Jetty and OpenEJB to play together.
Thanks,
David
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 05, 2002 10:48 PM
> To: David Blevins
> Subject: RE: [OpenEJB-user] OpenEJB and Jetty
>
>
>
> Hi David,
>
> I'll be downloading the new release in the near future. For
> the moment, my
> problem with Jetty and OpenEJB integration has been solved.
> We're now
> able to use an IDE to debug our app from servlets to EJBs.
>
> Cheers, Michael
>
>
>
>
>
>
> "David
>
> Blevins" To:
> <[EMAIL PROTECTED]>, "'LASKOWSKI,JACEK
> <david.blevins (HP-Poland,ex1)'"
> <[EMAIL PROTECTED]>
> @visi.com> cc:
> <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
> Sent by: Subject: RE:
> [OpenEJB-user] OpenEJB and Jetty
> "David
>
> Blevins"
>
> <david.blevins
>
> @visi.com>
>
>
>
> 06/09/2002
>
> 13:16
>
>
>
>
>
>
>
>
> Michael,
>
> We just cut OpenEJB 0.8.2 a few minutes ago. We are excited
> about this release as it contains some classpath
> enhancements, new documentation, and several fixes from Apple.
>
> Download that here:
> https://sourceforge.net/project/showfiles.php?group_id=44351&r
> elease_id=
> 108833
>
> Some details on the classpath changes are here:
> https://sourceforge.net/tracker/index.php?func=detail&aid=6037
> 84&group_i
> d=44351&atid=460291
>
> Drop the new OpenEJB libraries in place of the old ones and
> see if the problem doesn't magically go away.
>
> Let us know how it goes.
>
> David
>
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]] On Behalf Of
> > [EMAIL PROTECTED]
> > Sent: Thursday, September 05, 2002 7:26 PM
> > To: LASKOWSKI,JACEK (HP-Poland,ex1)
> > Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> > Subject: RE: [OpenEJB-user] OpenEJB and Jetty
> >
> >
> >
> > Hi Jacek,
> >
> > thanks for your thoughts. It led me to try something that ended my
> > misery.
> >
> > In my original code I use Jetty libraries to create a http
> server that
> > contains a HttpContext object. The example code from Jetty
> allows for
> > a classpath to be set for the HttpContext object and the
> documentation
> > indicates this should include any servlets that have been
> developed.
> > I found that if I don't specify this claspath programatically then
> > the ClassCastException problems disappears. This seems to validate
> > your thoughts on separate ClassLoaders for Jetty and OpenEJB.
> >
> > Thanks again.
> >
> > Cheers, Michael
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > "LASKOWSKI,JAC
> >
> > EK To:
> > "'[EMAIL PROTECTED]'"
> > (HP-Poland,ex1
> > <[EMAIL PROTECTED]>
> >
> > )" cc:
> >
> > <jacek_laskows Subject: RE:
> > [OpenEJB-user] OpenEJB and Jetty
> > [EMAIL PROTECTED]>
> >
> > Sent by:
> >
> > "LASKOWSKI,JAC
> >
> > EK
> >
> > (HP-Poland,ex1
> >
> > )"
> >
> > <jacek_laskows
> >
> > [EMAIL PROTECTED]>
> >
> >
> >
> > 05/09/2002
> >
> > 21:56
> >
> >
> >
> >
> >
> >
> >
> >
> > Hi,
> >
> > I did, but not with OpenEJB.
> >
> > It happens when an application manages a bunch of
> classloaders, each
> > responsible for other class sets. A class is uniquely named by the
> > classloader, which loaded the class plus its fully qualified name
> > (i.e. the package and the class name). The application is
> the servlet
> > container - Jetty. It creates the classloaders, and once the class
> > unmarshalled (i.e. copied in IntraVM mode) in one
> classloader is tried
> > to be cast to the same class, *but* in another classloader, the
> > clash occurs.
> >
> > So, I guess you added OpenEJB classes to WEB-INF/lib *and* Jetty's
> > CLASSPATH or something like this. In other words, make sure that
> > OpenEJB jars are only in one place available for Jetty. Otherwise,
> > you'll face the (very subtle) problem with narrow().
> >
> > I remember I lost a whole day trying to find out what's
> wrong when the
> > same problem hit me. It was very important day in my Java career :-)
> >
> > -Jacek
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, September 05, 2002 9:14 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: [OpenEJB-user] OpenEJB and Jetty
> > >
> > >
> > > Hi,
> > >
> > > I'm trying to setup a dev environment running Jetty 4.0.5
> > and OpenEJB
> > > 0.8.1 with EJBs accessed in locally (intraVM).
> > >
> > > I've been successful in getting accessing a simple
> > HelloWorld ejb from
> > > an application but having problems from Jetty. The
> problem occurs
> > > after the context lookup of the EJB home. When
> attempting to narrow
> > > the home object or simply just casting it I get a
> > > ClassCastException.
> > >
> > > I've been successful in getting accessing a simple
> > HelloWorld ejb from
> > > an application but having problems from Jetty. The
> problem occurs
> > > after attempting to narrow the EJB home object (or just
> casting it)
> > > returned from the context lookup. The error is a class cast
> > > exception. This error does
> > > not occur when running exactly the same code in a simple
> application
> > > (rather than a servlet inside Jetty).
> > >
> > > Has anyone experienced this problem.
> > >
> > > Cheers, Michael
> > >
> > >
> > >
> > > _________________________________________
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> _________________________________________
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JettyServer.java
Description: Binary data
