I have this problem in some situations too.

I have a tomcat instance with multiple Tapestry5 apps, some with 5.3 versions 
and anothers with 5.4 versions. To work fine, when I restart the tomcat, I have 
to start / load first the 5.3 apps, and then the 5.4, it’s the only way to run 
everyone in the same tomcat. I didn´t find any solution, I think I would have 
to install 5.3 apps on a dedicated tomcat and 5.4 into another one.

I hope my experience helps you.

Regards

Carlos Montero

> El 24/5/2018, a las 1:07, Richard Frovarp <rfrov...@apache.org> escribió:
> 
> 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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