Classloading Mysteries: WHATSUP?

Micael Fri, 28 Mar 2003 23:51:44 -0800

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 [EMAIL PROTECTED]

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.jar file:C:\michaelmcgrady\tomcat\common\lib\servlet.jar required: ----------> Parent Classloader: [EMAIL PROTECTED]

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.jar file:C:\michaelmcgrady\tomcat\common\lib\servlet.jar required: ----------> Parent Classloader: [EMAIL PROTECTED]

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Classloading Mysteries: WHATSUP?

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