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From Kent SĂžlvsten Rasmussen <k...@aarhusmail.dk>
Subject Re: Struts PlugIn Interface Mystery: Where does the second classcome from?
Date Sat, 29 Mar 2003 10:48:47 GMT
It sounds like a Tomcat-Users question, please post it there.

If I were you, I would check my server.xml first, the same webapp might be there twice.


Micael <caraunltd@harbornet.com> wrote:
> I have created a daemon which I want to startup when Tomcat
> is started 
> up.  If I configure the daemon to be started with a servlet
> in web.xml or 
> by using a PlugIn interface and struts-config.xml, I get two
> daemons 
> running.  How I don't know.  If I don't start the daemon at
> startup but by 
> tweaking a servlet after startup, where the servlet calls
> the daemon, then 
> I don't get two daemons.  Does anyone have any idea how this
> is 
> happening?  I am getting two classloaders of the same type,
> i.e. same type 
> but different hashcodes.  Anyone know what is going on.  I
> am running 
> Struts 1.1 and Tomcat 1.1.18.  I have asked this question in
> a few ways 
> with no responses.  I can find nothing relevant in the
> archives.  They are 
> both coming from the WebappClassLoader which has as a parent
> 
> sun.misc.Launcher$AppClassLoader@17172ea.
> 
> Hopefully someone has some assistance, because I am somewhat
> at a 
> loss.  This must have something to do with the launcher, but
> I don't know 
> what.  I have tried to get some information for a week out
> of this 
> list.  Not sure if no one is doing PlugIns, or why there is
> so little 
> interest in this.
> 
> The hashcodes I get for the classloaders are as follows:
> 
> 
> LOOP: ClassLoader.hashCode(): 728272 Class.hashCode():
> 15612583   Check 
> No.: 657) Fri Mar 28 22:47:17 PST 2003 END
> 
> 
> LOOP: ClassLoader.hashCode(): 20632381 Class.hashCode():
> 10973446  Check 
> No.: 659) Fri Mar 28 22:47:19 PST 2003 END
> 
> The details on the classloaders are:
> 
> LOOP: ClassLoader.toString(): WebappClassLoader
>    available:
>      Extension[org.apache.commons.beanutils,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.4-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.collections,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=2.0,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.dbcp,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.digester,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.3-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[commons-lang, implementationVendor=Apache
> Software 
> Foundation, implementationVersion=1.0-dev,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.logging,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.pool,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.resources,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=0.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.services,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[Struts Framework, implementationVendor=Apache
> Software 
> Foundation, implementationVendorId=org.apache,
> implementationVersion=1.0, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[Components Framework,
> implementationVendor=Apache Software 
> Foundation, implementationVendorId=org.apache,
> implementationVersion=0.7, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>    delegate: false
>    repositories:
>      /WEB-INF/classes/
>    required:
> ----------> Parent Classloader:
> StandardClassLoader
>    available:
>    delegate: true
>    repositories:
>    required:
> ----------> Parent Classloader:
> StandardClassLoader
>    available:
>      Extension[org.apache.tools.ant,
> implementationVendor=Apache Software 
> Foundation, implementationVersion=1.5.1,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.5.1]
>      Extension[org.apache.commons.collections,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.logging,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0.2, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>    delegate: true
>    repositories:
>      file:C:\michaelmcgrady\tomcat\common\lib\ant.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\commons-collections
> .jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\commons-logging-api
> .jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jasper-compiler.jar
> 
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jasper-runtime.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jdbc2_0-stdext.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-common.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-factory.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-resources.ja
> r
>      file:C:\michaelmcgrady\tomcat\common\lib\servlet.jar
>    required:
> ----------> Parent Classloader:
> sun.misc.Launcher$AppClassLoader@17172ea
> 
> 
>   Class.toString(): class 
> com.michaelmcgrady.util.message.messages.ip_address.IpDaemon
> /No.: 0) Fri 
> Mar 28 22:57:36 PST 2003 END
> 
> 
> LOOP: ClassLoader.hashCode(): 12864392 Class.hashCode():
> 32915800/No.: 0) 
> Fri Mar 28 22:57:36 PST 2003 END
> 
> 
> LOOP: ClassLoader.toString(): WebappClassLoader
>    available:
>      Extension[org.apache.commons.beanutils,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.4-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.collections,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=2.0,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.dbcp,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.digester,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.3-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[commons-lang, implementationVendor=Apache
> Software 
> Foundation, implementationVersion=1.0-dev,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.logging,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.pool,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.0]
>      Extension[org.apache.commons.resources,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=0.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.services,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[Struts Framework, implementationVendor=Apache
> Software 
> Foundation, implementationVendorId=org.apache,
> implementationVersion=1.0, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[Components Framework,
> implementationVendor=Apache Software 
> Foundation, implementationVendorId=org.apache,
> implementationVersion=0.7, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>    delegate: false
>    repositories:
>      /WEB-INF/classes/
>    required:
> ----------> Parent Classloader:
> StandardClassLoader
>    available:
>    delegate: true
>    repositories:
>    required:
> ----------> Parent Classloader:
> StandardClassLoader
>    available:
>      Extension[org.apache.tools.ant,
> implementationVendor=Apache Software 
> Foundation, implementationVersion=1.5.1,
> specificationVendor=Apache 
> Software Foundation, specificationVersion=1.5.1]
>      Extension[org.apache.commons.collections,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.1-dev, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>      Extension[org.apache.commons.logging,
> implementationVendor=Apache 
> Software Foundation, implementationVersion=1.0.2, 
> specificationVendor=Apache Software Foundation,
> specificationVersion=1.0]
>    delegate: true
>    repositories:
>      file:C:\michaelmcgrady\tomcat\common\lib\ant.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\commons-collections
> .jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\commons-logging-api
> .jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jasper-compiler.jar
> 
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jasper-runtime.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\jdbc2_0-stdext.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-common.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-factory.jar
>     
> file:C:\michaelmcgrady\tomcat\common\lib\naming-resources.ja
> r
>      file:C:\michaelmcgrady\tomcat\common\lib\servlet.jar
>    required:
> ----------> Parent Classloader:
> sun.misc.Launcher$AppClassLoader@17172ea 
> 
> 
> 
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