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Posted to users@tomcat.apache.org by Benjamin Swanson <ba...@yahoo.com> on 2003/10/06 23:43:00 UTC
Instantiate a bean on startup
Hello all. Is there an easy way to instantiate a bean
as soon as tomcat starts? Basically, I want a bean to
be instantiated and available to all sessions as soon
tomcat starts. Any ideas?
ben
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RE: Instantiate a bean on startup
Posted by Peter Guyatt <pg...@telesoft-technologies.com>.
Hi There,
If you only want to have one instance of a class for many objects then use
the following
class myClass {
private static myClass c = null;
public myClass () {
//set stuff
}
public static myClass Instance () {
if (c==null) {
c = new myClass();
}
return c;
}
}
now the data member c holds a reference to itself and is returned every time
you call the Instance method, it is only instantiated once.
If you put this in a session listeners constructor it will be instantiated
when the listener is.
Now every time you call the static method Instance from any servlet or JSP
page you will be working with that version of the class only.
Hope this helps
Thanks
Pete
-----Original Message-----
From: Nikola Milutinovic [mailto:Nikola.Milutinovic@ev.co.yu]
Sent: 07 October 2003 06:22
To: Tomcat Users List
Subject: Re: Instantiate a bean on startup
> Hello all. Is there an easy way to instantiate a bean
> as soon as tomcat starts? Basically, I want a bean to
> be instantiated and available to all sessions as soon
> tomcat starts. Any ideas?
There is no such thing as "Tomcat scope" for variables, so you're hosed. Not
just with Tomcat...
Why would you want to do something like that? There is no way to specify
what is to be done on Tomcat's startup (there is for a particular
application). And even if you hack it somehow, how will any Servlet access
that object?
Nix.
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Re: Instantiate a bean on startup
Posted by Nikola Milutinovic <Ni...@ev.co.yu>.
> Hello all. Is there an easy way to instantiate a bean
> as soon as tomcat starts? Basically, I want a bean to
> be instantiated and available to all sessions as soon
> tomcat starts. Any ideas?
There is no such thing as "Tomcat scope" for variables, so you're hosed. Not just with Tomcat...
Why would you want to do something like that? There is no way to specify what is to be done on Tomcat's startup (there is for a particular application). And even if you hack it somehow, how will any Servlet access that object?
Nix.
RE: Instantiate a bean on startup
Posted by "Richard Mixon (qwest)" <rn...@custco.biz>.
You did not say which Tomcat version you are using, but if you are using 4.0 or higher you should be able to use a listener that can
do whatever you want at startup.
Check the web.xml docs or the servlet spec.
- Richard
-----Original Message-----
From: Benjamin Swanson [mailto:baswanson@yahoo.com]
Sent: Monday, October 06, 2003 2:43 PM
To: tomcat-user@jakarta.apache.org
Subject: Instantiate a bean on startup
Hello all. Is there an easy way to instantiate a bean
as soon as tomcat starts? Basically, I want a bean to
be instantiated and available to all sessions as soon
tomcat starts. Any ideas?
ben
__________________________________
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http://shopping.yahoo.com
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