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From "Clinton Goudie" <ClintJaka...@magicalspirits.net>
Subject RE: Tomcat + James in a single jvm process
Date Wed, 05 Jun 2002 16:17:29 GMT
If you really want to pull this off, create yourself a java class that looks
about like this...

public class WebServices{
     public static void main(String[] args){
          new Thread(){
               public void run(){
          new Thread(){
               public void run(){

Compile it and off you should go.

The next step would be to configure the JavaService.exe that tomcat uses to
start and stop this wrapper class..;

Keep in mind the liabilities you're encountering that have already been
discussed involving memory and resources. In addition you also have the
liability that if either app calles System.exit it's going to kill both.

Personally, I prefer to run them both as separate services so that I can
stop and start the different services individually.


-----Original Message-----
From: mohan narayanaswamy [mailto:mohandb2@yahoo.co.uk]
Sent: Wednesday, June 05, 2002 12:20 AM
To: James Developers List
Subject: Re: Tomcat + James in a single jvm process

Thankyou Michael,

I am seriously thinking about ur way of solution. it's
too cool.
  But i have some silly questions in my mind. if EJB
container+any-embeded-sql-server(java based)+servlet
container can run in a single JVM why can't i do the
same. And think about the other benefits.

  Client can simply invoke only one script which is
easy to maintain. And by tradition normally all the
product will run in a single process( am not sure ).
moreover what i want to know  is how can i embed or
include some other package inside james or tomcat. so
that we can integarate any other server.

with warm regards

 --- Michael Locasto <mlocasto@pfsmarketing.com>
wrote: > Mohan,
> While it is true that starting and running a single
> JVM instance is less
> expensive (mostly in terms of memory)
> than starting and running two or more JVMs on the
> same processor/box,
> there are several good reasons for
> keeping Tomcat and James running in separate JVMs.
> Trying to avoid the
> "overhead" of two JVMs really
> doesn't gain you anything significant. What is more
> critical is the work
> done inside the two threads (James,Tomcat).
> Heap size is a concern. JVMs have a limit on the
> amount of memory they use
> by default. You can run the JVM with a -server
> option, which AFAIK increases that limit. However,
> depending on your load,
> having both Tomcat and James in the same JVM may
> cause you to run
> into a shortage of resources within the JVM, even
> though you may have
> saved on memory outside the JVM.
> Second, you are putting all your eggs in one basket
> (sorry for the idiom).
> Putting both Tomcat and James in the same JVM
> is not a fault-tolerant solution. If the JVM
> crashes, you lose both your
> servers. If your clients have a two processor
> machine,
> or two boxes, keeping them separate will provide you
> and them with a more
> scaleable solution.
> Third, it should be relatively simple for you to
> write a custom
> start/build script that runs both Tomcat and James.
> In this way, it
> still "looks" like you are starting a single
> process, but inside the
> script you start 2 JVMs (or call the Tomcat startup
> script and the James
> startup script). That approach is much easier than
> trying to tie the two
> binaries together or compile a custom version.
> If you are looking for tutorials for Tomcat, the
> documentation within the
> Tomcat distributions and on the tomcat website is
> very good. http://jakarta.apache.org/tomcat/  The
> default configuration
> for the Tomcat distribution runs with minimal
> changes.
> Of course, what JSP/webapps you put in from there is
> another story ;) The
> tomcat-users mailing list should be fairly helpful
> along with the docs.
> I hope this has been helpful.
> Cheers,
> Michael
> ----- Original Message -----
> From: "mohan narayanaswamy" <mohandb2@yahoo.co.uk>
> To: "James Developers List"
> <james-dev@jakarta.apache.org>
> Sent: Tuesday, June 04, 2002 7:02 AM
> Subject: RE: Tomcat + James in a single jvm process
> > single JVM process will reduce the overload.
> > u will be required less cpu,memory and moreover
> > efficient when compared to two process server.
> >
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