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

Sat Nov 15 21:58:00 CET 2003

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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> > > >
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