Re: multiple instances of load-on-startup classes
Hi! I think I have the exact same problem as you. I have two servlets, one under /tomcat/webapps/ROOT/ and another under /tomcat/webapps/anotherapp/ For the latter servlet I get four instances(!). But the first only one instance (normal case?) There are no duplicates in the web.xml files either. I really think that this is a serious bug... BR Magnus - Original Message - From: dirk ooms [EMAIL PROTECTED] To: Tomcat Users List users@tomcat.apache.org Sent: Tuesday, June 27, 2006 3:04 PM Subject: Re: multiple instances of load-on-startup classes i had something similar and the reason then was that i had duplicate context definition files. it seems that your context definition is not in server.xml, so you might check whether there are duplicate context files somewhere in tomcat/conf/... dirk On Tuesday 27 June 2006 13:43, Mark Benussi wrote: We have a webapp running within Tomcat 5.0.28 on Linux. The message log indicates that any load-on-startup classes are loaded twice. Also, any singleton objects created by these load-on-startup classes are created twice. This has been confirmed by stepping through the code via a debugger. From what I have gathered from web search it looks like the webapp is being loaded twice - each instance of the webapp uses a seperate class-loader which accounts for seeing multiple instances of singleton objects. Can anyone shed any light on what may is going on here. Is the webapp being loaded twice? Is there a problem with Tomcat's server.xml? I have included the application log, server.xml and web.xml below: +Applic ation Log + DEBUG 10:37:29,411 CpmDigester:CpmDigester(...) - Config file name = '/usr/local/home/paphdv14/.cpm.xml' DEBUG 10:37:29,527 CpmDigester:loadResults() - About to parse config file DEBUG 10:37:29,682 CpmDigester:loadResults() - config file parsed DEBUG 10:37:30,279 Information on the connection pool 'WEBCP'... DEBUG 10:37:30,279 Number of active connections = 1 DEBUG 10:37:30,279 Number of idle connections = 0 INFO 10:37:31,369 Loading validation rules file from '/WEB-INF/validator-rules.xml' INFO 10:37:31,375 Loading validation rules file from '/WEB-INF/validation-web.xml' INFO 10:37:31,705 Tiles definition factory loaded for module '/web'. DEBUG 10:37:31,731 WebLoginInitialiserPlugIn:init() - START INFO 10:37:31,851 Tiles definition factory loaded for module '/imm'. INFO 10:37:31,851 Loading validation rules file from '/WEB-INF/validator-rules.xml' INFO 10:37:31,851 Loading validation rules file from '/WEB-INF/validation-imm.xml' INFO 10:37:32,039 WebApplicationInitialisation:init(...) - Web application initialisation starting... INFO 10:37:32,039 WebApplicationInitialisation:init(...) - Initialising context parameters. DEBUG 10:37:32,039 WebApplicationInitialisation:init(...) - param = ./web/mainPage.do DEBUG 10:37:33,114 CpmDigester:CpmDigester(...) - Config file name = '/usr/local/home/paphdv14/.cpm.xml' DEBUG 10:37:33,154 CpmDigester:loadResults() - About to parse config file DEBUG 10:37:33,279 CpmDigester:loadResults() - config file parsed DEBUG 10:37:33,816 Information on the connection pool 'WEBCP'... DEBUG 10:37:33,817 Number of active connections = 1 DEBUG 10:37:33,817 Number of idle connections = 0 INFO 10:37:34,473 Loading validation rules file from '/WEB-INF/validator-rules.xml' INFO 10:37:34,475 Loading validation rules file from '/WEB-INF/validation-web.xml' INFO 10:37:34,854 Tiles definition factory loaded for module '/web'. DEBUG 10:37:34,866 WebLoginInitialiserPlugIn:init() - START INFO 10:37:34,918 Tiles definition factory loaded for module '/imm'. INFO 10:37:34,918 Loading validation rules file from '/WEB-INF/validator-rules.xml' INFO 10:37:34,918 Loading validation rules file from '/WEB-INF/validation-imm.xml' INFO 10:37:34,982 WebApplicationInitialisation:init(...) - Web application initialisation starting... INFO 10:37:34,982 WebApplicationInitialisation:init(...) - Initialising context parameters. DEBUG 10:37:34,982 WebApplicationInitialisation:init(...) - param = ./web/mainPage.do #65279;?xml version=1.0 encoding=UTF-8? web-app xmlns=http://java.sun.com/xml/ns/j2ee; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xsi:schemaLocation=http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd; version=2.4 description/description filter filter-nameSessionFilter/filter-name filter-classuk.co.etc.web.session.filter.SessionFilter/filter-class /filter filter-mapping filter-nameSessionFilter/filter-name url-pattern*.do/url-pattern /filter-mapping filter-mapping filter-nameSessionFilter/filter-name url-pattern*.jsp/url-pattern /filter-mapping filter-mapping filter-nameSessionFilter/filter-name url-pattern/servlet/*/url-pattern /filter-mapping servlet
Re: Multiple instances of servlets
Hi Len, The SingleThreadModel Interface is _not_ used in the servlet. Maybe I should write a bugreport? Thanks for your help! BR/Magnus - Original Message - From: Len Popp [EMAIL PROTECTED] To: Tomcat Users List users@tomcat.apache.org Sent: Friday, June 16, 2006 6:30 PM Subject: Re: Multiple instances of servlets I don't see anything there that would cause the servlet in mydomain2 to be loaded 4 times. The only thing I can think of is that the servlet might be running in single-thread mode (by implementing the SingleThreadModel interface). -- Len On 6/14/06, Magnus Larsgården [EMAIL PROTECTED] wrote: Hi Len! This is how my two web.xml files look like: /home/web/tomcat/webapps/ROOT/WEB-INF/web.xml !-- ** -- !-- ** -- servlet servlet-namecom.mydomain1.bookingManager.BookingManager/servlet-name servlet-classcom.mydomain1.bookingManager.BookingManager/servlet-class load-on-startup1/load-on-startup /servlet servlet-mapping servlet-namecom.mydomain1.bookingManager.BookingManager/servlet-name url-pattern/servlet/com.mydomain1.bookingManager.BookingManager/url-pattern /servlet-mapping !-- ** -- !-- ** -- servlet -- servlet-namecom.mydomain1.log.Log/servlet-name servlet-classcom.mydomain1.log.Log/servlet-class /servlet servlet-mapping servlet-namecom.mydomain1.log.Log/servlet-name url-pattern/servlet/com.mydomain1.log.Log/url-pattern /servlet-mapping !-- ** -- !-- ** -- servlet -- servlet-namecom.mydomain1.poll.PollMain/servlet-name servlet-classcom.mydomain1.poll.PollMain/servlet-class /servlet servlet-mapping servlet-namecom.mydomain1.poll.PollMain/servlet-name url-pattern/servlet/com.mydomain1.poll.PollMain/url-pattern /servlet-mapping !-- ** -- !-- ** -- servlet -- servlet-namecom.mydomain1.discgolf.bookingManager.BookingManager/servlet-name servlet-classcom.mydomain1.discgolf.bookingManager.BookingManager/servlet-class load-on-startup2/load-on-startup /servlet servlet-mapping servlet-namecom.mydomain1.discgolf.bookingManager.BookingManager/servlet-name url-pattern/servlet/com.mydomain1.discgolf.bookingManager.BookingManager/url-pattern /servlet-mapping !-- ** -- !-- ** -- servlet -- servlet-namecom.mydomain1.discgolf.poll.PollMain/servlet-name servlet-classcom.mydomain1.discgolf.poll.PollMain/servlet-class /servlet servlet-mapping servlet-namecom.mydomain1.discgolf.poll.PollMain/servlet-name url-pattern/servlet/com.mydomain1.discgolf.poll.PollMain/url-pattern /servlet-mapping /home/web/tomcat/webapps/mydomain2/WEB-INF/web.xml !-- ** -- !-- ** -- servlet servlet-namecom.mydomain2.bookingManager.BookingManager/servlet-name servlet-classcom.mydomain2.bookingManager.BookingManager/servlet-class load-on-startup1/load-on-startup !-- load-on-startup1/load-on-startup -- /servlet servlet-mapping servlet-namecom.mydomain2.bookingManager.BookingManager/servlet-name url-pattern/servlet/com.mydomain2.bookingManager.BookingManager/url-pattern /servlet-mapping As I mentioned earlier it is mydomain2 that get four instances of the BookingManager servlet. Comments? Thanks /Magnus - Original Message - From: Len Popp [EMAIL PROTECTED] To: Tomcat Users List users@tomcat.apache.org Sent: Wednesday, June 14, 2006 4:44 PM Subject: Re: Multiple instances of servlets How many web.xml files do you have, and how many servlet declarations are there in those files? Each one of those is a different servlet (even if some of them happen to be implemented by similar Java classes). Normally, Tomcat will create one instance of each of those servlets (or one per JVM in a distributed application). Things are different if you use the single-thread model, but that's not recommended. See the servlet spec for the official details. -- Len On 6/14/06, Magnus Larsgården [EMAIL PROTECTED] wrote: Hi all, Is Tomcat supposed to create multiple instances of my servlet at startup? Or is it a bug? Background: I have two different domains connected to my
Multiple instances of servlets
Hi all, Is Tomcat supposed to create multiple instances of my servlet at startup? Or is it a bug? Background: I have two different domains connected to my Tomcat server (version 5.5.17): http://mydomain1.host.com and http://mydomain2.host.com mydomain1 is directed to /home/web/tomcat/webapps/ROOT/ and mydomain2 is directed to /home/web/tomcat/webapps/mydomain2/ Both domains use a copy of the same servlet except that they belong to different packages. Ex: The .java files under mydomain1 belong to package com.mydomain1.bookingManager and are located under /home/web/tomcat/webapps/ROOT/WEB-INF/classes/com/mydomain1/bookingManager/ The .java files under mydomain2 belong to package com.mydomain2.bookingManager and are located under /home/web/tomcat/webapps/mydomain2/WEB-INF/classes/com/mydomain2/bookingManager/ Problem: == When Tomcat starts it creates only ONE instance of the mydomain1 -servlet, and FOUR instances of the mydomain2 servlet. I would really like to only have ONE instance of each servlet. How can I achieve this? I have searched Google for answers but only found contradicting statements. Some say that Tomcat creates one, and only one instance of each servlet. Other say the opposite. All help is appreciated! Thanks in advance BR/Magnus - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
