Thanks for the replies, I think I understand what is happening now, I think for safety's sake I will use a separate config file for each web app instead of trying to share one between them all and load separate copies.
Thank you. -----Original Message----- From: Mark Thomas [mailto:[EMAIL PROTECTED] Sent: 09 May 2008 13:41 To: Tomcat Users List Subject: Re: Possible to assign different class loader for each web app with tomcat [EMAIL PROTECTED] wrote: > Ok thanks, it's starting to become clearer now. > The class file is in > a jar file that lives in tomcat\shared\lib. I am guessing that these > classes are loaded by a class loader further up the hierarchy > described in the tomcat docs. I suppose in this instance there would > only be one class loaded? Correct. The class would be loaded once but that doesn't prevent multiple instances of the class being created. However, I suspect the class in question uses the singleton pattern so there is also only once instance. This instance will be shared between all webapps. > I guess if this is the case the only thing confusing me is why this > class is actually loaded by tomcat when it doesn't have to be? Does > the <load-on-startup>1</load-on-startup> tag not load a class > specifically for this web app regardless of where the class file might be? No. load-on-startup requires Tomcat to load the servlet when the context starts and the number dictates the order (as per the spec). The class loaders will be searched in the order described in the docs and the first instance found of the class will be used. If (as it appears from your description) you have webapp specific information being held in a singleton class then you *must* place that class in WEB-INF/classes or the jar containing it in WEB-INF/lib shared/lib is for classes that can be safely shared between multiple webapps. Personally I never used it. It generally caused more problems than it solved - one of the reasons it is removed by default in 6.0.x onwards. > Thanks for the help by the way. No problem. Mark --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ********************************************************************** This message may contain confidential and privileged information. If you are not the intended recipient please accept our apologies. Please do not disclose, copy or distribute information in this e-mail or take any action in reliance on its contents: to do so is strictly prohibited and may be unlawful. Please inform us that this message has gone astray before deleting it. Thank you for your co-operation. NHSmail is used daily by over 100,000 staff in the NHS. Over a million messages are sent every day by the system. To find out why more and more NHS personnel are switching to this NHS Connecting for Health system please visit www.connectingforhealth.nhs.uk/nhsmail ********************************************************************** --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
