Odd breaking exception in 5.4

I'm having some very odd problems with Tapestry 5.4.3. Most of my stuff 
is on 5.3, so I haven't been able to dig very deep on this, and I'm not 
quite sure what I'm missing. I'm running Tomcat 8.5.x. Now, it appears 
that might be from 
classpath:org/apache/tapestry5/corelib/pages/ExceptionReport.tml. But 
something else must be generating the error. I've been able to make it 
go away with a restart of Tomcat, but not of just the app itself. I'm 
fairly confused. I think that the exception being reported isn't the 
actual root cause, but rather the exception that is reported due to an 
error with reporting the actual exception.

2018-05-23 17:57:10,697 [ERROR] ioc.Registry java.lang.NullPointerException
2018-05-23 17:57:10,698 [ERROR] ioc.Registry Operations trace:
2018-05-23 17:57:10,698 [ERROR] ioc.Registry [ 1] Handling page render 
request for page Index
2018-05-23 17:57:10,698 [ERROR] ioc.Registry [ 2] Constructing instance 
of page class edu.ndsu.eci.international_capstone_exchange.pages.Index
2018-05-23 17:57:10,698 [ERROR] ioc.Registry [ 3] Creating 
ComponentAssembler for 
edu.ndsu.eci.international_capstone_exchange.pages.Index
2018-05-23 17:57:10,698 [ERROR] ioc.Registry [ 4] Parsing component 
template 
classpath:edu/ndsu/eci/international_capstone_exchange/pages/Index.tml
2018-05-23 17:57:10,712 [ERROR] TapestryModule.RequestExceptionHandler 
Processing of request failed with uncaught exception: 
org.apache.tapestry5.ioc.internal.OperationException
org.apache.tapestry5.ioc.internal.OperationException
         at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:186)
         at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:90)
         at 
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
         at 
org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
         at 
org.apache.tapestry5.internal.services.TemplateParserImpl.parseTemplate(TemplateParserImpl.java:57)
         at $TemplateParser_95423bef7.parseTemplate(Unknown Source)
         at 
org.apache.tapestry5.internal.services.ComponentTemplateSourceImpl.parseTemplate(ComponentTemplateSourceImpl.java:190)
         at 
org.apache.tapestry5.internal.services.ComponentTemplateSourceImpl.getTemplate(ComponentTemplateSourceImpl.java:162)
         at $ComponentTemplateSource_95423bef6.getTemplate(Unknown Source)
         at 
org.apache.tapestry5.internal.pageload.PageLoaderImpl$4.invoke(PageLoaderImpl.java:258)
         at 
org.apache.tapestry5.internal.pageload.PageLoaderImpl$4.invoke(PageLoaderImpl.java:251)
         at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
         at 
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
         at 
org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)

snip

Caused by: java.lang.NullPointerException
         at 
org.apache.tapestry5.internal.services.XMLTokenStream.getLocation(XMLTokenStream.java:487)
         at 
org.apache.tapestry5.internal.services.SaxTemplateParser.parse(SaxTemplateParser.java:181)
         at 
org.apache.tapestry5.internal.services.TemplateParserImpl$1.invoke(TemplateParserImpl.java:61)
         at 
org.apache.tapestry5.internal.services.TemplateParserImpl$1.invoke(TemplateParserImpl.java:58)
         at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
         ... 102 more
2018-05-23 17:57:10,804 [ERROR] ioc.Registry java.lang.NullPointerException
2018-05-23 17:57:10,804 [ERROR] ioc.Registry Operations trace:
2018-05-23 17:57:10,804 [ERROR] ioc.Registry [ 1] Constructing instance 
of page class org.apache.tapestry5.corelib.pages.ExceptionReport
2018-05-23 17:57:10,804 [ERROR] ioc.Registry [ 2] Creating 
ComponentAssembler for org.apache.tapestry5.corelib.pages.ExceptionReport
2018-05-23 17:57:10,804 [ERROR] ioc.Registry [ 3] Parsing component 
template classpath:org/apache/tapestry5/corelib/pages/ExceptionReport.tml


To add to the confusion, I've never had the error trigger when running 
on my workstation using Tomcat, just as installed on our server. Almost 
makes me think that it is trying to write somewhere that is causing 
problems. I just restarted Tomcat, and it now loads. How do I find root 
cause? I've turned logging all the way up, and then there is too much 
noise. Since I can't get it to trigger on my workstation, I can't get a 
debugger connected to figure it out from there.

Thanks,

Richard


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