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Re: How to connect applet to different SQL server.

From: doug(at)dupreeinc(dot)com
To: pgsql-novice <pgsql-novice(at)postgreSQL(dot)org>
Cc: Chris Ryan <chris(at)greatbridge(dot)com>, sturban(at)cs(dot)uiowa(dot)edu, egomolka(at)gyldan(dot)com
Subject: Re: How to connect applet to different SQL server.
Date: 2000-08-21 18:29:31
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
Stuart, Ed, and Chris:  Thank you for the information on the java - postgresql
question.  I will look into RMI as I am not familar with it.  I will check out
the other suggestions as well.

I am also tracking down a fourth option for this problem.  It appears that one
can sign their applet with a digital signature and request additional rights
to allow connections to other systems.    It is true that the java VM is
allowed to connect only to the system that supplied the applet. I found some
information on this at the following site:

The problem with this method (it seems to me, but I have not tried it) is that
the user will have to "ALLOW" the additional rights each time they use my

Again, thanks for the help!


Chris Ryan wrote:

> The problem with Java Applets is that most browsers disallow network
> connections to any machine other than the machine that the applet was
> downloaded from. These issues have to do with security and while there
> are legit reasons for  wanting to connect to other machines the applet
> standard has never made strong requirements or specifications for
> telling a browser to allow such services. They are working on it.... not
> that it helps you know :)
> What Stuard Urban suggested in his email is a way of going about doing
> it. This would work well if you had the data access objects on a single
> machine and sever client servers for the applets on multiple webservers.
> This would allow for updates to the query java code without propogating
> the changes to several machines.
> A slightly easier solution would be to just write a java application
> that runs on the server and connects using jdbc to the database
> directly. This does not have the benifit as the above mentioned solution
> though.
> Chris Ryan
> doug(at)dupreeinc(dot)com wrote:
> >
> > Hello,
> >
> > This question is not exactly on topic, but I hope someone here can point
> > me in the correct direction.
> >
> > I have a postgresql database on machine1 that works fine.  I have a
> > applet served by machine2 that needs to reference the postgresql
> > database on machine1.  how do I go about doing this?  My applet works
> > fine in the JBuilder Applet viewer, but it will not run on the live
> > systems.  I think this is because of a browser security violation, but I
> > have not been able to find a work around.  Please let me know any
> > suggestions you may have on how to make this work.
> >
> > Thank you for your time!
> >
> > Doug T.

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