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Subject: AW: Are static vars VM dependend or ClassLoader dependend [offtopic]
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Thread-Topic: Are static vars VM dependend or ClassLoader dependend [offtopic]
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From: "Ralph Einfeldt" <ralph.einfeldt@uptime-isc.de>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
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Haven't tried that, as we just use one context, but as I=20
understand it, it's the following way:

It depends on where you place the class file or the jar file
that holds the class that implements the singleton.

If you place it in <CATALINA_BASE>/webapps/<context>/WEB-INF/lib
or <CATALINA_BASE>/webapps/<context>/WEB-INF/classes then each=20
webapp should have his own singleton.=20

If you place the class outside the webapp (<CATALINA_BASE>/lib
or <CATALINA_BASE>/classes or <CATALINA_HOME>/common/lib or
<CATALINA_HOME>/common/classes) all webapps in the same VM should=20
share the singleton.

Also have a look at
http://jakarta.apache.org/tomcat/tomcat-4.0-doc/class-loader-howto.html
(I think this document says <CATALINA_HOME> at some places where=20
<CATALINA_BASE> would be more correct if they point to different=20
directories)

> -----Urspr=FCngliche Nachricht-----
> Von: Stefan Langer [mailto:mailtolanger@web.de]
> Gesendet: Mittwoch, 19. Juni 2002 13:14
> An: Tomcat-User-Maillist
> Betreff: Are static vars VM dependend or ClassLoader dependend
> [offtopic]
>=20
> Stated differently is the static variable the
> same for each webapplication in the Tomcat instance or does=20
> each Context have its own copy of the static since each=20
> context is loaded by a different classloader. As far as my=20
> testing has gotten I think that the static is only available=20
> once in the Tomcat installation.
>
> Can anybody confirm this or for that deny it??
>=20

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