m.seaman at infracaninophile.co.uk
Sat Aug 16 09:15:42 PDT 2003
On Fri, Aug 15, 2003 at 08:33:13PM -0400, David Banning wrote:
> I have some menu server java applets I would like to run on my fbsd server
> but I have no idea where to get started. Some initial inquiries on Google
> have not brought any luck.
> Is there any sites that deal with this, or does anyone have a suggestion?
described as ECMAScript nowadays -- is a language superficially
similar to Java but that is interpreted within a web browser.
Unfortunately each different brand of browser has it's own idea of
what ECMAScript should be, and that makes it quite tricky to write a
web page that works reasonably in any browser. See
for an attempt at providing a standard and
directly into a web page or is served up in a separate file
(traditionally with a .js suffix) referenced from the page in
question. Or in other words, just slap it into the documents
directory of your webserver alongside the .html files.
Java on the other hand is a recent addition to the C-like language
group which has the distinction of running in a virtual machine.
This, together with the inherent object-orientation of the language
and Sun's fanatical dedication to preserving the language standards
means that *compiled* Java class files can be run unmodified on any
platform that supports Java.
Java is a general purpose language, and standalone Java applications
are certainly available. However, most people will run into Java in
the contexts of "applets". This is a mini java application that can
be downloaded via a web browser and run in a limited "sandbox" context
on the local machine. See for instance
http://gregegan.customer.netspace.net.au/APPLETS/Applets.html for an
interesting selection of mathematics oriented examples.
However, what I suspect you have are the converse of that: java
servlets. These are mini-applications that run as part of a web
*server*. These are conceptually similar to other dynamic web
languages, like PHP, ASP or some sorts of embedded mod_perl stuff, but
the scope is larger: as well as the dynamic .jsp pages (which are
internally converted to java code and compiled into Java servlets on
the fly) there are also pre-compiled Java classes of various types.
In order to serve such "webapps" to the net in general, you will need
a Java servlet container. That's a webserver written in Java with all
the necessary internal wiring to be able to load up the webapp object
structure. There are several available in ports: the various
jakarta-tomcat versions (www/jakarta-tomcat*)and Jetty (www/jetty).
But wait! There's more. The webapp servlet stuff corresponds roughly
to the middle (logic) tier of a 3-tier application. There's an
equivalent setup "Enterprise Java Beans" which (very roughly)
corresponds to the 3rd (data) layer in a 3-tier application -- the
'Java Bean' is often an object abstraction for accessing an underlying
RDBMS, but it's not limited to that. [The web browser and any
(presentation) layer in this concept]. See the java/jboss3 port for a
freely available EJB server -- an alternative to the default J2EE
stuff that Sun supplies, but which isn't actually available on FreeBSD
as far as I know.
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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