[opencms-dev] Challange! External Program access to OpenCMS I nstance...

Sat Nov 15 22:37:02 CET 2003

What you could do is to make a server that offers commands like the CmsShell
which you call over RMI and the server operates on the OpenCms.

----- Original Message -----
From: "Ralf Bierig" <ambiesense at gmx.de>
To: <opencms-dev at opencms.org>
Sent: Saturday, November 15, 2003 10:28 PM
Subject: Re: [opencms-dev] Challange! External Program access to OpenCMS I
nstance...

> Hi Stephan,
>
> yes, I got a NotSerializableException. It seems that I cannot use RMI
> interface to connect to OpenCMS. It seems that OpenCMS is not made for any
other
> access then web.
>
> It is quite disappointing...
>
> Ralf
>
> > Hi Ralf,
> >
> > it won't help to mark the OpenCms class as serializable. All members of
> > OpenCms and the members' members have to be serializable as well (or
> > transient, but thats surely not what you want).
> >
> > Bye,
> > Stephan
> >
> > ----- Original Message -----
> > From: "Ralf Bierig" <ambiesense at gmx.de>
> > To: <opencms-dev at opencms.org>
> > Sent: Saturday, November 15, 2003 9:43 PM
> > Subject: RE: [opencms-dev] Challange! External Program access to OpenCMS
I
> > nstance...
> >
> >
> > > Hello,
> > >
> > > I followed your tip and programmed a RMI Server, which is initiateed
by
> > the
> > > OpenCmsHTTPServlet class when the opencms servlet it called. The
server
> > is
> > > up
> > > and running.
> > >
> > > However when I access the server and want to get the OpenCms object I
> > get
> > > the following message:
> > >
> > > System RemoteExceptionjava.rmi.UnmarshalException: error unmarshalling
> > > return; nested exception is:
> > > java.io.WriteAbortedException: writing aborted;
> > > java.io.NotSerializableException: com.opencms.core.OpenCms
> > >
> > > The OpenCms object does indeed not implement the Serializable
interface.
> > My
> > > question now is, when I modify the OpenCms class file and add that it
> > > implements Serializable will it work then and will it work properly?
> > >
> > > Is the problem another one and how can I fix it. I am soooo close and
> > there
> > > should be a way...
> > >
> > >
> > > Cheers,
> > > Ralf
> > >
> > > > You will need RMI to call the wrapper class if you start another
> > > > application
> > > > with "java myApplication" because then you start a new JVM,
different
> > than
> > > > the JVM which is started by your web application and in which your
> > wrapper
> > > > class was initialized.
> > > > w
> > > >
> > > > -----Original Message-----
> > > > From: ambiesense at gmx.de [mailto:ambiesense at gmx.de]
> > > > Sent: mercredi 12 novembre 2003 14:32
> > > > To: opencms-dev at opencms.org
> > > > Subject: RE: [opencms-dev] Challange! External Program access to
> > OpenCMS
> > > > I nstance...
> > > >
> > > >
> > > > Hello Wouter,
> > > >
> > > > can another Java program (started indepentendly with "java
> > myApplication")
> > > > call the static Wrapper embedded as part of the OpenCMS server? If
> > this
> > is
> > > > possible, then I am fine.
> > > >
> > > > I think this is more a Java question then a OpenCMS question. I
> > appologise
> > > > if I might have confused you.
> > > >
> > > > Ralf
> > > >
> > > > > I don't understand exactly what you are trying to say. Why don't
you
> > > > > consider the Wrapper class as being part of the OpenCms server ?
> > It's
> > > > > the
> > > > > client which afterwards calls the wrapper class in order to get
> > acces
> > > > > to the
> > > > > singleton OpenCms.
> > > > >
> > > > > Concerning the other question , as long you keep the singleton
> > "single"
> > > > > there no problem that different threads or clients (possibly
through
> > > > > rmi)
> > > > > make use of the singleton. They all use a reference to the same
> > object.
> > > > >
> > > > > wouter
> > > > >
> > > > > -----Original Message-----
> > > > > From: Ralf Bierig [mailto:ambiesense at gmx.de]
> > > > > Sent: mercredi 12 novembre 2003 11:22
> > > > > To: opencms-dev at opencms.org
> > > > > Subject: Re: [opencms-dev] Challange! External Program access to
> > > > > OpenCMS
> > > > > Instance...
> > > > >
> > > > >
> > > > > Hi Matt and Wouter,
> > > > >
> > > > > the method is more direct. However using this appraoch would
change
> > the
> > > > > workflow. My initial idea was that OpenCMS with data and
everything
> > is
> > > > > like
> > > > > a
> > > > > service and I have a client, who can access this without
> > > > > HTTP/SOAP/Webservice
> > > > > but API(local)/RMI or Sockets.
> > > > >
> > > > > Wouter's method is good but change the workflow in the way that
the
> > > > > OpenCMS
> > > > > server is acutally calling my application (the wrapper). This
would
> > > > > turn
> > > > > OpenCMS into a pseudo client and the application which was
supposed
> > to
> > > > > be a
> > > > > client into a pseudo server. The application would be invoked by
> > > > > starting
> > > > > OpenCMS.
> > > > > I would like it however the other way round. Would this be
possible
> > to
> > > > > start
> > > > > a RMI server/Socket Server with this extra line and let the
> > appliation
> > > > > client connect to that, get the OpenCms Object and work with the
> > > > > singleton
> > > > > OpenCms
> > > > > instance.
> > > > >
> > > > > If more then one client applications would connect like that,
would
> > > > > this way
> > > > > of accessing still ensure that each client sees the same (files,
> > users,
> > > > > etc)?
> > > > >
> > > > > Another question based on the fact that I would accept the fact
that
> > > > > OpenCMS
> > > > > starts the application. Could  this line:
> > > > >
> > > > > // added by myself
> > > > > opencms.addons.CmsWrapper.setOpenCms(m_opencms);
> > > > > // end added by myself
> > > > >
> > > > > be extended to start a number of appliations (Wrappers)
> > simultaniously
> > > > > (i.e.
> > > > > as Threads). Would this still ensure that each application would
see
> > > > > the
> > > > > same OpenCMS instance with the same changes made by others (i.e.
> > users,
> > > > > files,
> > > > > tasks...)?
> > > > >
> > > > > Cheers,
> > > > > Ralf
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > Ralf Bierig wrote:
> > > > > > > Hello Matt,
> > > > > > >
> > > > > > > thank you again for you competent answer.
> > > > > > >
> > > > > > > Do you agree that this solution should not have side effects,
if
> > > > > the
> > > > > > only
> > > > > > > user would be this Java programm and there would NO OTHER user
> > > > > logged in
> > > > > > via
> > > > > > > HTTP/Tomcat?
> > > > > >
> > > > > > I think that should be okay. wouter's method is probably better,
> > > > > though
> > > > > > -- esp. if you were planning on using RMI anyway.
> > > > > >
> > > > > > Matt
> > > > > >
> > > > > > _______________________________________________
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