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From "Tony Fountain" <tfount...@benefitconcepts.com>
Subject RE: Class loading issue
Date Fri, 26 Oct 2007 15:11:38 GMT
The exact error is this:

java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
	at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl not found
	at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown
Source)
	at
org.apache.commons.modeler.util.DomUtil.readXml(DomUtil.java:241)
	at
org.apache.commons.modeler.modules.MbeansDescriptorsDOMSource.execute(Mb
eansDescriptorsDOMSource.java:87)
	at
org.apache.commons.modeler.modules.MbeansDescriptorsDOMSource.loadDescri
ptors(MbeansDescriptorsDOMSource.java:77)
	at org.apache.commons.modeler.Registry.load(Registry.java:791)
	at
org.apache.commons.modeler.Registry.loadDescriptors(Registry.java:900)
	at
org.apache.commons.modeler.Registry.loadMetadata(Registry.java:267)
	at
org.apache.catalina.storeconfig.StoreConfigLifecycleListener.createMBean
(StoreConfigLifecycleListener.java:93)
	at
org.apache.catalina.storeconfig.StoreConfigLifecycleListener.lifecycleEv
ent(StoreConfigLifecycleListener.java:58)
	at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSu
pport.java:120)
	at
org.apache.catalina.core.StandardServer.start(StandardServer.java:705)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
	... 6 more

That's the entire contents of the stdout log file.  I don't mind moving
the vendor specific jar files to the \common\lib folder, but I would
like to make sense of why it happens as well.  Note that implementing
this product is my first exposure in 15 years of programming to Java /
Apache technologies :).  Not that they (.NET / IIS vs Java / Apache) are
too dissimilar, rather it's the implementation topics like this I
struggle with at the moment.

Thanks,
Tony

-----Original Message-----
From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com] 
Sent: Friday, October 26, 2007 9:51 AM
To: Tomcat Users List
Subject: RE: Class loading issue

> From: Tony Fountain [mailto:tfountain@benefitconcepts.com]
> Subject: Class loading issue
> 
> but when the webapp loads, one of the classes it requires generates an

> error the first time the webapp is accessed via the browser.

What error?  Do you have an associated stack trace?  Is there anything
in the logs?

Note that common/lib is visible not only to the webapp, but also to the
container classes.  Just speculating, but if the classes in question are
used somehow for something like container-managed connection pooling,
they must be visible to Tomcat as well as the webapp.

 - Chuck


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