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

[ambiesense at gmx.de]

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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> > visit
> > > http://mail.opencms.org/mailman/listinfo/opencms-dev
> > > 
> > 
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