YES, about link works, with errors in logs, both in Tomcat 7 and 5, (and the
index page continues to barf in Tomcat 7).  Here is the corresponding 
stacktrace: 

First [ERROR] is from About page (renders fine though).  Second, now
familiar, [ERROR] is generated by clicking on Index link from About page


Application 'app' (version 1.0-SNAPSHOT) startup time: 234 ms to build IoC
Regis
try, 780 ms overall.

 ______                  __             ____
/_  __/__ ____  ___ ___ / /_______ __  / __/
 / / / _ `/ _ \/ -_|_-</ __/ __/ // / /__ \
/_/  \_,_/ .__/\__/___/\__/_/  \_, / /____/
        /_/                   /___/  5.3.2


Apr 12, 2012 11:39:37 PM org.apache.catalina.startup.HostConfig
deployDirectory
INFO: Deploying web application directory ROOT
Apr 12, 2012 11:39:37 PM org.apache.coyote.http11.Http11AprProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Apr 12, 2012 11:39:37 PM org.apache.coyote.ajp.AjpAprProtocol start
INFO: Starting Coyote AJP/1.3 on ajp-8009
Apr 12, 2012 11:39:37 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1434 ms
[INFO] AppModule.TimingFilter Request time: 1092 ms
[INFO] AppModule.TimingFilter Request time: 46 ms
[INFO] AppModule.TimingFilter Request time: 46 ms
[INFO] AppModule.TimingFilter Request time: 46 ms
[INFO] AppModule.TimingFilter Request time: 46 ms
[ERROR] AssetsModule.ResourceMinimizer Exception minimizing 'core'
JavaScript st
ack, for locale en,
resources=classpath:org/apache/tapestry5/underscore_1_1_7.js
, classpath:org/apache/tapestry5/scriptaculous_1_9_0/prototype.js,
classpath:org
/apache/tapestry5/scriptaculous_1_9_0/scriptaculous.js,
classpath:org/apache/tap
estry5/scriptaculous_1_9_0/effects.js,
classpath:org/apache/tapestry5/t5-core.js
, classpath:org/apache/tapestry5/t5-spi.js,
classpath:org/apache/tapestry5/t5-pr
ototype.js, classpath:org/apache/tapestry5/t5-init.js,
classpath:org/apache/tape
stry5/t5-pubsub.js, classpath:org/apache/tapestry5/t5-events.js,
classpath:org/a
pache/tapestry5/t5-dom.js, classpath:org/apache/tapestry5/t5-console.js,
classpa
th:org/apache/tapestry5/t5-ajax.js,
classpath:org/apache/tapestry5/t5-formfragme
nt.js, classpath:org/apache/tapestry5/t5-alerts.js,
classpath:org/apache/tapestr
y5/tapestry.js, classpath:org/apache/tapestry5/tapestry-console.js,
classpath:or
g/apache/tapestry5/tree.js,
classpath:org/apache/tapestry5/tapestry-messages.js:
 java.util.EmptyStackException
java.util.EmptyStackException
        at java.util.Stack.peek(Stack.java:85)
        at
com.yahoo.platform.yui.compressor.JavaScriptCompressor.getCurrentScop
e(JavaScriptCompressor.java:559)
        at
com.yahoo.platform.yui.compressor.JavaScriptCompressor.printSymbolTre
e(JavaScriptCompressor.java:1105)
        at
com.yahoo.platform.yui.compressor.JavaScriptCompressor.compress(JavaS
criptCompressor.java:553)
        at
org.apache.tapestry5.internal.yuicompressor.JavaScriptResourceMinimiz
er.doMinimize(JavaScriptResourceMinimizer.java:99)
        at
org.apache.tapestry5.internal.yuicompressor.AbstractMinimizer$1.perfo
rm(AbstractMinimizer.java:67)
        at
org.apache.tapestry5.internal.TapestryInternalUtils$5.run(TapestryInt
ernalUtils.java:582)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(Opera
tionTrackerImpl.java:51)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(Opera
tionTrackerImpl.java:48)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(Operati
onTrackerImpl.java:74)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationT
rackerImpl.java:47)
        at
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerTh
readOperationTracker.java:76)
        at
org.apache.tapestry5.ioc.internal.RegistryImpl.run(RegistryImpl.java:
1116)
        at
org.apache.tapestry5.internal.TapestryInternalUtils.performIO(Tapestr
yInternalUtils.java:576)
        at
org.apache.tapestry5.internal.yuicompressor.AbstractMinimizer.minimiz
e(AbstractMinimizer.java:61)
        at
org.apache.tapestry5.internal.services.assets.MasterResourceMinimizer
.minimize(MasterResourceMinimizer.java:44)
        at $ResourceMinimizer_2584ccfdb20b.minimize(Unknown Source)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.assembleStackContent(StackAssetRequestHandler.java:175)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.assembleStackContent(StackAssetRequestHandler.java:163)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.getUncompressedResource(StackAssetRequestHandler.java:146)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.getCompressedResource(StackAssetRequestHandler.java:132)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.getResource(StackAssetRequestHandler.java:123)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.access$100(StackAssetRequestHandler.java:40)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r$1.perform(StackAssetRequestHandler.java:103)
        at
org.apache.tapestry5.internal.TapestryInternalUtils$5.run(TapestryInt
ernalUtils.java:582)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(Opera
tionTrackerImpl.java:51)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl$1.invoke(Opera
tionTrackerImpl.java:48)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(Operati
onTrackerImpl.java:74)
        at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationT
rackerImpl.java:47)
        at
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerTh
readOperationTracker.java:76)
        at
org.apache.tapestry5.ioc.internal.RegistryImpl.run(RegistryImpl.java:
1116)
        at
org.apache.tapestry5.internal.TapestryInternalUtils.performIO(Tapestr
yInternalUtils.java:576)
        at
org.apache.tapestry5.internal.services.assets.StackAssetRequestHandle
r.handleAssetRequest(StackAssetRequestHandler.java:96)
        at
org.apache.tapestry5.internal.services.AssetDispatcher.dispatch(Asset
Dispatcher.java:114)
        at $Dispatcher_2584ccfdb200.dispatch(Unknown Source)
        at $Dispatcher_2584ccfdb204.dispatch(Unknown Source)
        at $Dispatcher_2584ccfdb1fe.dispatch(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator
.service(TapestryModule.java:302)
        at org.ideademo.piko.services.AppModule$1.service(AppModule.java:89)
        at $RequestFilter_2584ccfdb1fd.service(Unknown Source)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.RequestErrorFilter.service(Req
uestErrorFilter.java:26)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule
.java:902)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule
.java:892)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.StaticFilesFilter.service(Stat
icFilesFilter.java:90)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at $RequestHandler_2584ccfdb1f3.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandle
rTerminator.service(TapestryModule.java:253)
        at
org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java
:53)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(Ign
oredPathsFilter.java:62)
        at $HttpServletRequestFilter_2584ccfdb1f1.service(Unknown Source)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule
.java:852)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at $HttpServletRequestHandler_2584ccfdb1f0.service(Unknown Source)
        at
org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)

        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:242)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:208)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:240)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:203)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:164)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:108)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
558)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:118)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:379)
        at
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcesso
r.java:281)
        at
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.pr
ocess(Http11AprProtocol.java:357)
        at
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoin
t.java:1671)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:908)
        at java.lang.Thread.run(Thread.java:662)
[INFO] AppModule.TimingFilter Request time: 390 ms
[INFO] AppModule.TimingFilter Request time: 0 ms
[INFO] AppModule.TimingFilter Request time: 0 ms
[INFO] AppModule.TimingFilter Request time: 0 ms
[INFO] AppModule.TimingFilter Request time: 109 ms
[ERROR] TapestryModule.RequestExceptionHandler Processing of request failed
with
 uncaught exception: Component Index does not contain embedded component
'jsp'.
org.apache.tapestry5.ioc.util.UnknownValueException: Component Index does
not co
ntain embedded component 'jsp'.
        at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.getE
mbeddedElement(ComponentPageElementImpl.java:860)
        at
org.apache.tapestry5.internal.structure.PageImpl.getComponentElementB
yNestedId(PageImpl.java:116)
        at
org.apache.tapestry5.internal.services.ComponentEventRequestHandlerIm
pl.handle(ComponentEventRequestHandlerImpl.java:79)
        at
org.apache.tapestry5.internal.services.ImmediateActionRenderResponseF
ilter.handle(ImmediateActionRenderResponseFilter.java:42)
        at $ComponentEventRequestHandler_2584ccfdb293.handle(Unknown Source)
        at
org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.j
ava:42)
        at $ComponentEventRequestHandler_2584ccfdb293.handle(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$40.handle(TapestryModule
.java:2456)
        at $ComponentEventRequestHandler_2584ccfdb293.handle(Unknown Source)
        at $ComponentEventRequestHandler_2584ccfdb22c.handle(Unknown Source)
        at
org.apache.tapestry5.internal.services.ComponentRequestHandlerTermina
tor.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
        at
org.apache.tapestry5.services.InitializeActivePageName.handleComponen
tEvent(InitializeActivePageName.java:39)
        at
$ComponentRequestHandler_2584ccfdb22e.handleComponentEvent(Unknown So
urce)
        at
$ComponentRequestHandler_2584ccfdb201.handleComponentEvent(Unknown So
urce)
        at
org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispa
tch(ComponentEventDispatcher.java:46)
        at $Dispatcher_2584ccfdb204.dispatch(Unknown Source)
        at $Dispatcher_2584ccfdb1fe.dispatch(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator
.service(TapestryModule.java:302)
        at org.ideademo.piko.services.AppModule$1.service(AppModule.java:89)
        at $RequestFilter_2584ccfdb1fd.service(Unknown Source)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.RequestErrorFilter.service(Req
uestErrorFilter.java:26)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule
.java:902)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule
.java:892)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.StaticFilesFilter.service(Stat
icFilesFilter.java:90)
        at $RequestHandler_2584ccfdb1ff.service(Unknown Source)
        at $RequestHandler_2584ccfdb1f3.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandle
rTerminator.service(TapestryModule.java:253)
        at
org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java
:53)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at
org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(Ign
oredPathsFilter.java:62)
        at $HttpServletRequestFilter_2584ccfdb1f1.service(Unknown Source)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at
org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule
.java:852)
        at $HttpServletRequestHandler_2584ccfdb1f5.service(Unknown Source)
        at $HttpServletRequestHandler_2584ccfdb1f0.service(Unknown Source)
        at
org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)

        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:242)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:208)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:240)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:203)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:164)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:108)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
558)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:118)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:379)
        at
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcesso
r.java:281)
        at
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.pr
ocess(Http11AprProtocol.java:357)
        at
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoin
t.java:1671)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:908)
        at java.lang.Thread.run(Thread.java:662)


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