Hallo,
there are two protocols for EJB's:
Java Remote Method and IIOP.
First there was only Java Remote Method
Hermann Schmitt
-----Urspr�ngliche Nachricht-----
Von: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]Im Auftrag von Hal Hildebrand (Work)
Gesendet: Mittwoch, 13. Oktober 1999 17:38
An: [EMAIL PROTECTED]
Betreff: Re: AW: The truth about EJB's
From: Nadkarni, Chinmay (Chinmay)** CTR ** <[EMAIL PROTECTED]>
> Is'nt JRMP (Java Remote Method Protocol) the transport mechanism used by
EJB
> for any RMI invocations.
No.
> > ----------
> > From: Rumble, Nick[SMTP:[EMAIL PROTECTED]]
> > Reply To: A mailing list for Enterprise JavaBeans development
> > Sent: Wednesday, October 13, 1999 8:05 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: AW: The truth about EJB's
> >
> > .... And IIOP requires an ORB (whatever that is - please explain) to
host
> > the EJB ?
> >
> > -----Original Message-----
> > From: Hal Hildebrand (Work) [mailto:[EMAIL PROTECTED]]
> > Sent: 11 October 1999 16:34
> > To: [EMAIL PROTECTED]
> > Subject: Re: AW: The truth about EJB's
> >
> >
> > RMI is the interface definition language, not the transport mechanism.
We
> > use
> > our own flavor of RMI/IIOP.
> >
> > EJB uses RMI as the equivalent of IDL. EJB doesn't specify the
transport
> > mechanism.
> >
> > > I'm confused - where does an ORB come into the equation ?
> > >
> > > I thought that all EJB client/server communication was via RMI ?
> > >
> > > Can anyone clarify this for me.
> > >
> > > Thanks
> > >
> > > Nick
> > >
> > > -----Original Message-----
> > > From: Hal Hildebrand (Work) [mailto:[EMAIL PROTECTED]]
> > > Sent: 09 October 1999 17:58
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: AW: The truth about EJB's
> > >
> > >
> > > You do need to use Oracle's ORB when doing EJB's. The old Netscape
ORB
> > > won't
> > > work, and we're using our own version of RMI/IIOP (the JDK 1.2
rmi/iiop
> > > standard wasn't available when I did this).
> > >
> > > ----- Original Message -----
> > > From: John Collins <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Saturday, October 09, 1999 8:33 AM
> > > Subject: Re: AW: The truth about EJB's
> > >
> > >
> > > Actually, if the problem is with the browser's internal ORB (Netscape,
I
> > > assume), then it isn't the sandbox problem but an ORB compatibility
> > problem.
> > > Netscape includes a rather old version of VisiBroker. Using the 1.2
> > plug-in
> > > should solve the problem, or you can explicitly load a different ORB
> > along
> > > with your applet. You shouldn't need to use Oracle's ORB. The latter
> > > approach may make applet download times unacceptable, of course. Note
> > that
> > > most ORBs do not yet support the CallByValue mechanism needed by
> > RMI/IIOP.
> > > I
> > > believe the latest version of VisiBroker does.
> > >
> > > Good luck.
> > >
> > > John Collins
> > >
> > > Hermann Schmitt wrote:
> > >
> > > > Hallo,
> > > > I think the cause are the so called "sandbox restrictions" for
> > applets.
> > If
> > > > you use the Java Plug-in 1.2 with the browsers, you can use JDK
1.2.,
> > > which
> > > > does not haave the samd box restrictions.
> > > > Hermann Schmitt
> > > >
> > > > -----Urspr|ngliche Nachricht-----
> > > > Von: A mailing list for Enterprise JavaBeans development
> > > > [mailto:[EMAIL PROTECTED]]Im Auftrag von scott coleman
> > > > Gesendet: Freitag, 8. Oktober 1999 10:21
> > > > An: [EMAIL PROTECTED]
> > > > Betreff: The truth about EJB's
> > > > Wichtigkeit: Hoch
> > > >
> > > > Hi
> > > >
> > > > I wrote to one of your collegues and they informed to forward my
> > letter
> > > > to you, so here it is, it
> > > >
> > > > The problem is that we have a server with an Oracle database that
the
> > > > EJB's are deployed into. We then try to activate an EJB through a
web
> > > > browser and it is impossible. But if we have the same code but
> > activate
> > > > it through the applet veiwer or a Application it works. This appears
> > to
> > > > be due to the fact that the Web Browser has its own internal ORB.
And
> > > > oracle need there own to use the EJB's deployed into their database.
> > > > They have informed me that this is probably the case for all EJB
> > > > vendors.
> > > > I thought of using PowerTier as our EJB vendor, but their web pages
> > > > implies that ther have the same problem. The only way to instantiate
> > and
> > > > use an EJB on the server from with an Client Web Browser is to use
> > > > servlets, for creation and method calls etc.
> > > > Also i looked at the sun web page at a section called Communication
> > > > Protocols and it states "Browsers can invoke the application through
a
> > > > servlet running on the HTTP server. The browser communicates with
the
> > > > servlet using HTTP, and the servlet communicates with the
application
> > > > using RMI" which to me implies that you can only invoke an EJB on
the
> > > > server and communicate with it using a servlet running on the HTTP
> > > > server.
> > > >
> > > > I hope this has defined my question, is it possible to invoke and
> > > > communicate with an EJB on the Server directly from within a Web
> > Browser
> > > > without using servlets.
> > > >
> > > > I look forward to your reply
> > > > Scott
> > > > [EMAIL PROTECTED]
> > > >
> > > >
> > >
> >
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