My environment:
. Apache Tomcat/6.0.18
. JDK 1.6.0_12-b04

I got this weird message in tomcat log, too:

Nov 4, 2009 12:13:03 AM org.apache.catalina.startup.HostConfig
checkResources
INFO: Reloading context [/acm]
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[AppServlet]
has not been started
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[jsp]
has not been started
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[default]
has not been started
Nov 4, 2009 12:13:03 AM
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor
processChildren
SEVERE: Exception invoking periodic operation: 
java.lang.NoClassDefFoundError: org/apache/wicket/util/lang/PropertyResolver
        at org.apache.wicket.Application.internalDestroy(Application.java:887)
        at
org.apache.wicket.protocol.http.WebApplication.internalDestroy(WebApplication.java:448)
        at
org.apache.wicket.protocol.http.WicketFilter.destroy(WicketFilter.java:143)
        at
org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:332)
        at
org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:3744)
        at 
org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)
        at
org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1108)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1214)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at
org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.StandardContext reload
INFO: Reloading this Context has started
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[AppServlet]
has not been started
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[jsp]
has not been started
Nov 4, 2009 12:13:03 AM org.apache.catalina.core.ContainerBase stop
INFO: Container
org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/acm].[default]
has not been started
Nov 4, 2009 12:13:03 AM
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor
processChildren
SEVERE: Exception invoking periodic operation: 
java.lang.NoClassDefFoundError: org/apache/wicket/util/lang/PropertyResolver
        at org.apache.wicket.Application.internalDestroy(Application.java:887)
        at
org.apache.wicket.protocol.http.WebApplication.internalDestroy(WebApplication.java:448)
        at
org.apache.wicket.protocol.http.WicketFilter.destroy(WicketFilter.java:143)
        at
org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:332)
        at
org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:3744)
        at 
org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)
        at
org.apache.catalina.core.StandardContext.reload(StandardContext.java:3093)
        at
org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:404)
        at
org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1309)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
        at java.lang.Thread.run(Thread.java:619)

I checked wicket jar file, and org/apache/wicket/util/lang/PropertyResolver
class does exist.
Is it tomcat bug or wicket bug?
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