Hi, I finally took the plunge and I am migrating from 5.0.5 to 5.0.7.
(I also tried 5.0.8-Snapshot with the same issue)
I am using Tapestry Hibernate as well, but I don't think it's a problem.
After following the instructions on Migrating from 5.0.5 to 5.0.6, I
am running into a problem on a page that has many levels of nested
components.
On some pages with nested components, the application works as
expected.  The components that are causing failure are extending an
abstract base class that exists in a base/ directory.

I am running this with Tomcat.
There are a couple of bubble up Tapestry Exceptions before this, but
they don't really add to the issue.

#  org.apache.tapestry.internal.services.TransformationException
com/mycompany/myapp/wui/tapestry/components/setup/SelectDatabase

transformation

    InternalClassTransformation[
    public com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel
extends java.lang.Object
      implements org.apache.tapestry.runtime.Component,
org.apache.tapestry.runtime.RenderCommand

    add default method: public void postRenderCleanup()
    <default>

    add default method: public void
setupRender(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
beginRender(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
beforeRenderTemplate(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
afterRenderTemplate(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
beforeRenderBody(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
afterRenderBody(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
afterRender(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public void
cleanupRender(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.Event $2)
    <default>

    add default method: public boolean
handleComponentEvent(org.apache.tapestry.runtime.ComponentEvent $1)
    <default>

    add default method: public org.apache.tapestry.ComponentResources
getComponentResources()
    <default>

    add default method: public void containingPageDidLoad()
    <default>

    add default method: public void containingPageDidDetach()
    <default>

    add default method: public void containingPageDidAttach()
    <default>

    add field: protected final
org.apache.tapestry.internal.InternalComponentResources _$resources;

    replace method: public final
org.apache.tapestry.ComponentResources getComponentResources()
    return _$resources;

    add field: protected final
org.apache.tapestry.services.ApplicationStateManager
_$applicationStateManager;

    add field: protected final java.lang.Class _$setupRP_type;

    add method: private
com.mycompany.myapp.model.reporting.util.ReportPreferences
_$read_setupRP()
    return (com.mycompany.myapp.model.reporting.util.ReportPreferences)
_$applicationStateManager.get(_$setupRP_type);

    replace read setupRP: _$read_setupRP();

    add method: private void
_$write_setupRP(com.mycompany.myapp.model.reporting.util.ReportPreferences
$1)
    _$applicationStateManager.set(_$setupRP_type, $1);

    replace write setupRP: _$write_setupRP();

    remove field setupRP;

    add method: private boolean _$read_setupRPExists()
    return _$applicationStateManager.exists(_$setupRP_type);

    replace read setupRPExists: _$read_setupRPExists();

    add method: private void _$write_setupRPExists(boolean $1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.setupRPExists
is read-only.");

    replace write setupRPExists: _$write_setupRPExists();

    remove field setupRPExists;

    add field: protected final java.lang.Class _$user_type;

    add method: private
com.mycompany.myapp.accounts.util.security.CustomUser _$read_user()
    return (com.mycompany.myapp.accounts.util.security.CustomUser)
_$applicationStateManager.get(_$user_type);

    replace read user: _$read_user();

    add method: private void
_$write_user(com.mycompany.myapp.accounts.util.security.CustomUser $1)
    _$applicationStateManager.set(_$user_type, $1);

    replace write user: _$write_user();

    remove field user;

    add method: private boolean _$read_userExists()
    return _$applicationStateManager.exists(_$user_type);

    replace read userExists: _$read_userExists();

    add method: private void _$write_userExists(boolean $1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.userExists
is read-only.");

    replace write userExists: _$write_userExists();

    remove field userExists;

    add method: private void
_$write_hsm(org.apache.tapestry.hibernate.HibernateSessionManager $1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.hsm
is read-only.");

    replace write hsm: _$write_hsm();

    add method: private void
_$write_selectdatabase(com.mycompany.myapp.wui.tapestry.components.setup.SelectDatabase
$1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.selectdatabase
is read-only.");

    replace write selectdatabase: _$write_selectdatabase();

    extend method: public void containingPageDidLoad()
    selectdatabase =
(com.mycompany.myapp.wui.tapestry.components.setup.SelectDatabase)
_$resources.getEmbeddedComponent("selectdatabase");

    add method: private void
_$write_selectinstallation(com.mycompany.myapp.wui.tapestry.components.setup.SelectInstallation
$1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.selectinstallation
is read-only.");

    replace write selectinstallation: _$write_selectinstallation();

    extend method: public void containingPageDidLoad()
    selectinstallation =
(com.mycompany.myapp.wui.tapestry.components.setup.SelectInstallation)
_$resources.getEmbeddedComponent("selectinstallation");

    add method: private void
_$write_selectsite(com.mycompany.myapp.wui.tapestry.components.setup.SelectSite
$1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.selectsite
is read-only.");

    replace write selectsite: _$write_selectsite();

    extend method: public void containingPageDidLoad()
    selectsite =
(com.mycompany.myapp.wui.tapestry.components.setup.SelectSite)
_$resources.getEmbeddedComponent("selectsite");

    add method: private void
_$write_selectsiteininstallation(com.mycompany.myapp.wui.tapestry.components.setup.SelectSiteInInstallation
$1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.selectsiteininstallation
is read-only.");

    replace write selectsiteininstallation: _$write_selectsiteininstallation();

    extend method: public void containingPageDidLoad()
    selectsiteininstallation =
(com.mycompany.myapp.wui.tapestry.components.setup.SelectSiteInInstallation)
_$resources.getEmbeddedComponent("selectsiteininstallation");

    add method: private void
_$write_selecttype(com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevelType
$1)
    throw new java.lang.RuntimeException("Field
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.selecttype
is read-only.");

    replace write selecttype: _$write_selecttype();

    extend method: public void containingPageDidLoad()
    selecttype =
(com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevelType)
_$resources.getEmbeddedComponent("selecttype");

    extend method: public boolean
handleComponentEvent(org.apache.tapestry.runtime.ComponentEvent $1)
    {
      if ($1.isAborted()) return $_;
      String methodDescription = null;
      try
      {
        if ($1.matches("Activate", "", 0))
        {
          $_ = true;
          methodDescription =
"com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel.onActivate()
(at SelectSessionLevel.java:84)";
          $1.setSource(this, methodDescription);
          if ($1.storeResult(($w) onActivate())) return true;
        }
      }
      catch (Exception ex)
      {
        throw new
org.apache.tapestry.runtime.ComponentEventException(ex.getMessage(),
methodDescription, ex);
      }
    }


    add default method: public void
render(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.RenderQueue $2)
    <default>

    replace method: public void
render(org.apache.tapestry.MarkupWriter $1,
org.apache.tapestry.runtime.RenderQueue $2)
    _$resources.queueRender($2);

    add field: private
com.mycompany.myapp.model.domain.interfaces.IDisplayable
_$objectClass_default;

    extend method: public void containingPageDidLoad()
    _$objectClass_default = objectClass;

    extend method: public void containingPageDidDetach()
    objectClass = _$objectClass_default;

    Checking field read hsm in method getHsm(): field not transformed
    Checking field read setupRP in method getSetupRP(): replacing with
$_ = $0._$read_setupRP();
    Checking field read userExists in method getStandardUser():
replacing with $_ = $0._$read_userExists();
    Checking field read user in method getStandardUser(): replacing
with $_ = $0._$read_user();
    Checking field read STANDARD in method getStandardUser(): field
not transformed
    Checking field read userExists in method onActivate(): replacing
with $_ = $0._$read_userExists();
    Checking field read user in method onActivate(): replacing with $_
= $0._$read_user();
    Checking field read STANDARD in method onActivate(): field not transformed
    Checking field read user in method getUser(): replacing with $_ =
$0._$read_user();
    Checking field read setupRPExists in method isSetupRPExists():
replacing with $_ = $0._$read_setupRPExists();
    Checking field read userExists in method isUserExists(): replacing
with $_ = $0._$read_userExists();
    Checking field write hsm in method setHsm(): replacing with
$0._$write_hsm($1);
    Checking field write user in method setUser(): replacing with
$0._$write_user($1);
    Checking field write userExists in method setUserExists():
replacing with $0._$write_userExists($1);
    Checking field read objectClass in method getObjectClass(): field
not transformed
    Checking field write objectClass in method setObjectClass(): field
not transformed
    Checking field read selecttype in method checkValidity(): field
not transformed
    Checking field read logger in method checkValidity(): field not transformed
    Checking field read selecttype in method getSelecttype(): field
not transformed
    Checking field read selecttype in method getType(): field not transformed
    Checking field read logger in method getType(): field not transformed
    Checking field read Database in method getType(): field not transformed
    Checking field read selectdatabase in method getType(): field not
transformed
    Checking field read Installation in method getType(): field not transformed
    Checking field read selectinstallation in method getType(): field
not transformed
    Checking field read Site in method getType(): field not transformed
    Checking field read selectsite in method getType(): field not transformed
    Checking field read Site_In_Installation in method getType():
field not transformed
    Checking field read selectsiteininstallation in method getType():
field not transformed
    Checking field read logger in method getType(): field not transformed
    Checking field read _$resources in method containingPageDidLoad():
added method
    Checking field write selectdatabase in method
containingPageDidLoad(): added method
    Checking field read _$resources in method containingPageDidLoad():
added method
    Checking field write selectinstallation in method
containingPageDidLoad(): added method
    Checking field read _$resources in method containingPageDidLoad():
added method
    Checking field write selectsite in method containingPageDidLoad():
added method
    Checking field read _$resources in method containingPageDidLoad():
added method
    Checking field write selectsiteininstallation in method
containingPageDidLoad(): added method
    Checking field read _$resources in method containingPageDidLoad():
added method
    Checking field write selecttype in method containingPageDidLoad():
added method
    Checking field read objectClass in method containingPageDidLoad():
added method
    Checking field write _$objectClass_default in method
containingPageDidLoad(): added method
    Checking field read _$objectClass_default in method
containingPageDidDetach(): added method
    Checking field write objectClass in method
containingPageDidDetach(): added method
    Checking field read _$resources in method getComponentResources():
added method
    Checking field read _$applicationStateManager in method
_$read_setupRP(): added method
    Checking field read _$setupRP_type in method _$read_setupRP(): added method
    Checking field read _$applicationStateManager in method
_$write_setupRP(): added method
    Checking field read _$setupRP_type in method _$write_setupRP(): added method
    Checking field read _$applicationStateManager in method
_$read_setupRPExists(): added method
    Checking field read _$setupRP_type in method
_$read_setupRPExists(): added method
    Checking field read _$applicationStateManager in method
_$read_user(): added method
    Checking field read _$user_type in method _$read_user(): added method
    Checking field read _$applicationStateManager in method
_$write_user(): added method
    Checking field read _$user_type in method _$write_user(): added method
    Checking field read _$applicationStateManager in method
_$read_userExists(): added method
    Checking field read _$user_type in method _$read_userExists(): added method
    Checking field read _$resources in method render(): added method

    convert default constructor: initializer();

    add constructor:
com.mycompany.myapp.wui.tapestry.components.setup.SelectSessionLevel(org.apache.tapestry.internal.InternalComponentResources
$1, org.apache.tapestry.services.ApplicationStateManager $2,
java.lang.Class $3, java.lang.Class $4,
org.apache.tapestry.hibernate.HibernateSessionManager $5)
    {
      _$resources = $1;
      _$applicationStateManager = $2;
      _$setupRP_type = $3;
      _$user_type = $4;
      hsm = $5;
      initializer();

    }

    ]

# java.lang.NoClassDefFoundError
com/mycompany/myapp/wui/tapestry/components/setup/SelectDatabase

Stack trace

        * java.lang.Class.getDeclaredConstructors0(Native Method)
        * java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
        * java.lang.Class.getConstructors(Class.java:1446)
        * 
org.apache.tapestry.internal.services.ReflectiveInstantiator.findConstructor(ReflectiveInstantiator.java:61)
        * 
org.apache.tapestry.internal.services.ReflectiveInstantiator.<init>(ReflectiveInstantiator.java:49)
        * 
org.apache.tapestry.internal.services.InternalClassTransformationImpl.createInstantiator(InternalClassTransformationImpl.java:1209)
        * 
org.apache.tapestry.internal.services.ComponentClassTransformerImpl.createInstantiator(ComponentClassTransformerImpl.java:166)
        * 
org.apache.tapestry.internal.services.ComponentInstantiatorSourceImpl.findInstantiator(ComponentInstantiatorSourceImpl.java:224)
        * 
org.apache.tapestry.internal.services.PageElementFactoryImpl.newComponentElement(PageElementFactoryImpl.java:257)
        * 
org.apache.tapestry.internal.services.PageLoaderProcessor.startComponent(PageLoaderProcessor.java:562)
        * 
org.apache.tapestry.internal.services.PageLoaderProcessor.loadTemplateForComponent(PageLoaderProcessor.java:443)
        * 
org.apache.tapestry.internal.services.PageLoaderProcessor.workComponentQueue(PageLoaderProcessor.java:655)
        * 
org.apache.tapestry.internal.services.PageLoaderProcessor.loadPage(PageLoaderProcessor.java:341)
        * 
org.apache.tapestry.internal.services.PageLoaderImpl.loadPage(PageLoaderImpl.java:60)
        * 
org.apache.tapestry.internal.services.PagePoolImpl.checkout(PagePoolImpl.java:69)
        * 
org.apache.tapestry.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:43)
        * 
org.apache.tapestry.internal.services.LinkFactoryImpl.createPageLink(LinkFactoryImpl.java:223)
        * 
org.apache.tapestry.internal.structure.PageImpl.createPageLink(PageImpl.java:161)
        * 
org.apache.tapestry.internal.structure.ComponentPageElementImpl.createPageLink(ComponentPageElementImpl.java:763)
        * 
org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.createPageLink(InternalComponentResourcesImpl.java:116)
        * 
org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java:78)
        * 
org.apache.tapestry.corelib.components.PageLink.beginRender(PageLink.java)
        * 
org.apache.tapestry.internal.structure.ComponentPageElementImpl$10$1.run(ComponentPageElementImpl.java:330)
        * 
org.apache.tapestry.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:891)
        * 
org.apache.tapestry.internal.structure.ComponentPageElementImpl.access$100(ComponentPageElementImpl.java:56)
        * 
org.apache.tapestry.internal.structure.ComponentPageElementImpl$10.render(ComponentPageElementImpl.java:334)
        * 
org.apache.tapestry.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:58)
        * 
org.apache.tapestry.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:58)
        * 
org.apache.tapestry.internal.services.MarkupRendererPipelineImpl$1.renderMarkup(MarkupRendererPipelineImpl.java:39)
        * 
org.apache.tapestry.services.TapestryModule$20.renderMarkup(TapestryModule.java:1349)
        * 
org.apache.tapestry.services.TapestryModule$19.renderMarkup(TapestryModule.java:1330)
        * 
org.apache.tapestry.services.TapestryModule$18.renderMarkup(TapestryModule.java:1312)
        * 
org.apache.tapestry.services.TapestryModule$17.renderMarkup(TapestryModule.java:1294)
        * 
org.apache.tapestry.internal.services.MarkupRendererPipelineImpl.renderMarkup(MarkupRendererPipelineImpl.java:48)
        * 
org.apache.tapestry.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:55)
        * 
org.apache.tapestry.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:56)
        * 
org.apache.tapestry.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:87)
        * 
org.apache.tapestry.internal.services.RootPathDispatcher.dispatch(RootPathDispatcher.java:52)
        * 
org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:905)
        * 
com.mycompany.myapp.wui.tapestry.services.AppModule$1.service(AppModule.java:85)
        * 
org.apache.tapestry.internal.services.LocalizationFilter.service(LocalizationFilter.java:43)
        * 
org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:487)
        * 
org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
        * 
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:94)
        * 
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:85)
        * 
org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
        * 
org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:107)
        * 
org.apache.tapestry.services.TapestryModule$11.service(TapestryModule.java:888)
        * 
org.apache.tapestry.upload.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:42)
        * org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:164)
        * 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
        * 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
        * 
org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
        * 
org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:229)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.ui.logout.LogoutFilter.doFilter(LogoutFilter.java:106)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:286)
        * 
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        * 
org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
        * 
org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
        * 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
        * 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        * 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
        * 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
        * 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        * 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
        * 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
        * 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
        * 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
        * 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
        * 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
        * 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
        * 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
        * java.lang.Thread.run(Thread.java:595)

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