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Subject: RE: contextInitialized being called exactly twice
Date: Thu, 10 Jun 2004 14:06:21 -0400
Message-ID: <9C5166762F311146951505C6790A9CF80229BAF8@US-VS1.corp.mpi.com>
Thread-Topic: contextInitialized being called exactly twice
thread-index: AcRPCGd4WJga0wgPQdygaRShNOfbJAADQj+Q
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>


H=
i
I bet it's being called once for each time the context is deployed, an=
d
the context is deployed twice because you have autoDeploy on AND an
explicit context declaration in your server.xml/conf directory/WAR.
Turn autoDeploy off and see what happens.

(This would explain the static counter being 1: the counter is static
once per classloader repository, you have two of the same context at
different paths with different classloader repositories).

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Graham Smith [mailto:graham@crazysquirrel.com]
>Sent: Thursday, June 10, 2004 12:32 PM
>To: tomcat-user@jakarta.apache.org
>Subject: contextInitialized being called exactly twice
>
>Hi,
>
>I am absolutely stumped by this problem. For some reason that I can't=

>fathom the contextInitialized method on a ServletContextListener I ha=
ve
>in one of my web applications is being called twice. Normally this
isn't
>a problem since it only causes the load process to take longer but I
>have recently added a new section that starts a daemon thread and it
>this double call is causing two threads to be created. What is even
more
>bizarre is that I have tried using a static int to count the number o=
f
>times the method is called but it always returns one. I suspected tha=
t
>it therefore must be created by a different class loader but a call t=
o
>getClass().getClassLoader and a dump (see below) of information would=

>seem to indicate that it is in fact the same class loader loading the=

>class. I am using tomcat 5.0.25 on Linux with Java 1.4.2_04. I have
also
>performed a thread dump in order to check that it is _really_ being r=
un
>twice and sure enough there are two copies of my thread running (agai=
n
>see extract below).
>
>Any help would be greatly appreciated.
>
>Graham
>
>ClassLoader dump:
>----------------------------------------------------
>First time it is loaded
>----------------------------------------------------
>ClassLoader: WebappClassLoader
>   delegate: false
>   repositories:
>----------> Parent Classloader:
>StandardClassLoader
>   delegate: true
>   repositories:
>     file:/home/gms/dump/tomcat/shared/classes/
>----------> Parent Classloader:
>StandardClassLoader
>   delegate: true
>   repositories:
>     file:/home/gms/dump/tomcat/common/classes/
>     file:/home/gms/dump/tomcat/common/endorsed/xercesImpl.jar
>     file:/home/gms/dump/tomcat/common/endorsed/xmlParserAPIs.jar
>     file:/home/gms/dump/tomcat/common/lib/ant.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-collections.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-dbcp-1.1.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-el.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-pool-1.1.jar
>     file:/home/gms/dump/tomcat/common/lib/jasper-compiler.jar
>     file:/home/gms/dump/tomcat/common/lib/jasper-runtime.jar
>     file:/home/gms/dump/tomcat/common/lib/jsp-api.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-common.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-factory.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-java.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-resources.jar
>     file:/home/gms/dump/tomcat/common/lib/servlet-api.jar
>----------> Parent Classloader:
>sun.misc.Launcher$AppClassLoader@136228
>
>
>----------------------------------------------------
>Second time it is loaded
>----------------------------------------------------
>
>ClassLoader: WebappClassLoader
>   delegate: false
>   repositories:
>----------> Parent Classloader:
>StandardClassLoader
>   delegate: true
>   repositories:
>     file:/home/gms/dump/tomcat/shared/classes/
>----------> Parent Classloader:
>StandardClassLoader
>   delegate: true
>   repositories:
>     file:/home/gms/dump/tomcat/common/classes/
>     file:/home/gms/dump/tomcat/common/endorsed/xercesImpl.jar
>     file:/home/gms/dump/tomcat/common/endorsed/xmlParserAPIs.jar
>     file:/home/gms/dump/tomcat/common/lib/ant.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-collections.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-dbcp-1.1.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-el.jar
>     file:/home/gms/dump/tomcat/common/lib/commons-pool-1.1.jar
>     file:/home/gms/dump/tomcat/common/lib/jasper-compiler.jar
>     file:/home/gms/dump/tomcat/common/lib/jasper-runtime.jar
>     file:/home/gms/dump/tomcat/common/lib/jsp-api.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-common.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-factory.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-java.jar
>     file:/home/gms/dump/tomcat/common/lib/naming-resources.jar
>     file:/home/gms/dump/tomcat/common/lib/servlet-api.jar
>----------> Parent Classloader:
>sun.misc.Launcher$AppClassLoader@136228
>
>
>
>----------------------------------------------------
>Extract of thread dump
>----------------------------------------------------
>
>......
>
>
>"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=3D=
1
>tid=3D0x0848eb98 nid=3D0x7d54 waiting on condition [4d90d000..4d90d85=
4]
>         at java.lang.Thread.sleep(Native Method)
>         at
>org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r=
un
(Con
>tainerBase.java:1597)
>         at java.lang.Thread.run(Thread.java:534)
>
>"category statistics generator" daemon prio=3D1 tid=3D0x082e6960 nid=3D=
0x7d54
>waiting on condition [4e1de000..4e1de854]
>         at java.lang.Thread.sleep(Native Method)
>         at
>com.crazysquirrel.xfly.category.CategoryStats.run(CategoryStats.java:=
73
)
>         at java.lang.Thread.run(Thread.java:534)
>
>"directory cleaner" daemon prio=3D1 tid=3D0x0852dd30 nid=3D0x7d54 wai=
ting on
>condition [4e15d000..4e15d854]
>         at java.lang.Thread.sleep(Native Method)
>         at
>com.crazysquirrel.xfly.web.DirectoryCleaner.run(DirectoryCleaner.java=
:8
0)
>         at java.lang.Thread.run(Thread.java:534)
>
>"category statistics generator" daemon prio=3D1 tid=3D0x085072f8 nid=3D=
0x7d54
>waiting on condition [4e0dc000..4e0dc854]
>         at java.lang.Thread.sleep(Native Method)
>         at
>com.crazysquirrel.xfly.category.CategoryStats.run(CategoryStats.java:=
73
)
>         at java.lang.Thread.run(Thread.java:534)
>
>"directory cleaner" daemon prio=3D1 tid=3D0x084e7ea8 nid=3D0x7d54 wai=
ting on
>condition [4e05b000..4e05b854]
>         at java.lang.Thread.sleep(Native Method)
>         at
>com.crazysquirrel.xfly.web.DirectoryCleaner.run(DirectoryCleaner.java=
:8
0)
>         at java.lang.Thread.run(Thread.java:534)
>
>"Signal Dispatcher" daemon prio=3D1 tid=3D0x08096a50 nid=3D0x7d54 wai=
ting on
>condition [0..0]
>
>........
>
>---------------------------------------------------------------------=

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