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:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Application
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
<?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-name>SessionFilter</filter-name>
<filter-class>uk.co.etc.web.session.filter.SessionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SessionFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SessionFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SessionFilter</filter-name>
<url-pattern>/servlet/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>web-app-init</servlet-name>
<servlet-class>uk.co.etc.web.session.init.WebApplicationInitialisation</servlet-class>
<init-param>
<param-name>mainPageUri</param-name>
<param-value>/web/mainPage.do</param-value>
</init-param>
...
<load-on-startup>0</load-on-startup>
</servlet>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config-main.xml</param-value>
</init-param>
<init-param>
<param-name>config/web</param-name>
<param-value>/WEB-INF/struts-config-web.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
</web-app>
<Server port="12106" shutdown="SHUTDOWN" debug="0">
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"
debug="0"/>
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
debug="0"/>
<!-- Define the Tomcat Stand-Alone Service -->
<Service name="Catalina">
<!-- Define a non-SSL Coyote HTTP/1.1 Connector on port 8080 -->
<Connector port="12180"
maxThreads="100" minSpareThreads="5" maxSpareThreads="10"
enableLookups="false" redirectPort="8443" acceptCount="100"
debug="0" connectionTimeout="20000"
disableUploadTimeout="true" />
<!-- Define a Coyote/JK2 AJP 1.3 Connector on port 8009 -->
<Connector port="12109"
enableLookups="false" redirectPort="8443" debug="0"
protocol="AJP/1.3" />
<!-- Define the top level container in our container hierarchy -->
<Engine name="Catalina" defaultHost="paphdv14" debug="0">
<!-- Global logger unless overridden at lower levels -->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>
<Host name="paphdv14" appBase="webapps">
<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="paphdv14." suffix=".log"
timestamp="true"/>
</Host>
</Engine>
</Service>
</Server>
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