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

Sat Nov 15 22:29:02 CET 2003

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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