On Mon, 18 Nov 2002, Nicholas Orr wrote:
> Date: Mon, 18 Nov 2002 09:13:35 +1000 > From: Nicholas Orr <[EMAIL PROTECTED]> > Reply-To: Tomcat Users List <[EMAIL PROTECTED]> > To: 'Tomcat Users List' <[EMAIL PROTECTED]> > Subject: RE: how many tomcat in a machine? > > Just on this point of multiple Tomcat Instances, how does the JVM fit into > all of this. > ie does Tomcat1 use JVM1 and Tomcat2 use JVM2. Or does Tomcat1 & Tomcat2 use > JVM1? > > Also if you had one Tomcat Instances and 3 apps would they all share the one > instance of Log4j and its static methods or would there be three instances > of Log4j?? > When people talk about running mulitple Tomcat instances, they are talking about multiple JVMs, not one. Out of the box, Tomcat doesn't support multiple "instances" within a single JVM. Within a single JVM, whether things like LogJ are shared or not depends on where the classes are loaded from -- if they're inside the /WEB-INF/lib directories, each webapp will have their own; if they are loaded from some place like the common/lib directory, the classes will be shared. Howver, I understand that Log4J still supports per-webapp configuration of loggers in the shared case if you want it. See the Log4J docs for more info. For more background on class loading in Tomcat, see: http://jakarta.apache.org/tomcat/tomcat-4.1-doc/class-loader-howto.html > Nicholas Orr Craig -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
