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https://issues.apache.org/jira/browse/TAP5-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799206#action_12799206
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Stephan Windmüller commented on TAP5-311:
-----------------------------------------
Same problem here with Tapestry 5.1.0. The Stacktracke:
org.apache.tapestry5.runtime.ComponentEventException: Failure reading parameter
'source' of component MyComponent:beandisplay.loop: Property 'model' (within
property expression 'model.propertyNames', of
org.apache.tapestry5.corelib.components.beandisp...@10290442) is null. [at
context:MyComponent.tml, line 19]
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1098)
at
org.apache.tapestry5.internal.services.ComponentEventRequestHandlerImpl.handle(ComponentEventRequestHandlerImpl.java:75)
at
org.apache.tapestry5.internal.services.ImmediateActionRenderResponseFilter.handle(ImmediateActionRenderResponseFilter.java:42)
at
$ComponentEventRequestHandler_12622d29109.handle($ComponentEventRequestHandler_12622d29109.java)
at
org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
at
$ComponentEventRequestHandler_12622d29109.handle($ComponentEventRequestHandler_12622d29109.java)
at
org.apache.tapestry5.upload.internal.services.UploadExceptionFilter.handle(UploadExceptionFilter.java:75)
at
$ComponentEventRequestHandler_12622d29109.handle($ComponentEventRequestHandler_12622d29109.java)
at
org.apache.tapestry5.services.TapestryModule$36.handle(TapestryModule.java:2164)
at
$ComponentEventRequestHandler_12622d29109.handle($ComponentEventRequestHandler_12622d29109.java)
at
$ComponentEventRequestHandler_12622d28fbb.handle($ComponentEventRequestHandler_12622d28fbb.java)
at
org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
at
$ComponentRequestHandler_12622d28faf.handleComponentEvent($ComponentRequestHandler_12622d28faf.java)
at
org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:46)
at $Dispatcher_12622d28fb2.dispatch($Dispatcher_12622d28fb2.java)
at $Dispatcher_12622d28fa8.dispatch($Dispatcher_12622d28fa8.java)
at
org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:245)
at
org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
at $RequestHandler_12622d28fa9.service($RequestHandler_12622d28fa9.java)
at
org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:778)
at $RequestHandler_12622d28fa9.service($RequestHandler_12622d28fa9.java)
at
org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:767)
at $RequestHandler_12622d28fa9.service($RequestHandler_12622d28fa9.java)
at
org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:85)
at $RequestHandler_12622d28fa9.service($RequestHandler_12622d28fa9.java)
at
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90)
at
org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:81)
at
org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
at
org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103)
at $RequestHandler_12622d28fa9.service($RequestHandler_12622d28fa9.java)
at $RequestHandler_12622d28fa0.service($RequestHandler_12622d28fa0.java)
at
org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:197)
at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
at
$HttpServletRequestHandler_12622d28fa2.service($HttpServletRequestHandler_12622d28fa2.java)
at
org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
at
$HttpServletRequestHandler_12622d28fa2.service($HttpServletRequestHandler_12622d28fa2.java)
at
org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
at
$HttpServletRequestFilter_12622d28f9f.service($HttpServletRequestFilter_12622d28f9f.java)
at
$HttpServletRequestHandler_12622d28fa2.service($HttpServletRequestHandler_12622d28fa2.java)
at
org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:726)
at
$HttpServletRequestHandler_12622d28fa2.service($HttpServletRequestHandler_12622d28fa2.java)
at
$HttpServletRequestHandler_12622d28f9c.service($HttpServletRequestHandler_12622d28f9c.java)
at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:127)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
reading parameter 'source' of component MyComponent:beandisplay.loop: Property
'model' (within property expression 'model.propertyNames', of
org.apache.tapestry5.corelib.components.beandisp...@10290442) is null. [at
classpath:org/apache/tapestry5/corelib/components/BeanDisplay.tml, line 4]
at
org.apache.tapestry5.corelib.components.Form.executeStoredActions(Form.java:495)
at
org.apache.tapestry5.corelib.components.Form._$advised$onAction(Form.java:378)
at
org.apache.tapestry5.corelib.components.Form$onAction$invocation_12622de686b.invokeAdvisedMethod(Form$onAction$invocation_12622de686b.java)
at
org.apache.tapestry5.internal.services.AbstractComponentMethodInvocation.proceed(AbstractComponentMethodInvocation.java:71)
at
org.apache.tapestry5.ioc.internal.services.LoggingAdvice.advise(LoggingAdvice.java:37)
at
org.apache.tapestry5.internal.transform.LogWorker$1.advise(LogWorker.java:54)
at
org.apache.tapestry5.internal.services.AbstractComponentMethodInvocation.proceed(AbstractComponentMethodInvocation.java:80)
at org.apache.tapestry5.corelib.components.Form.onAction(Form.java)
at
org.apache.tapestry5.corelib.components.Form.dispatchComponentEvent(Form.java)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:910)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1081)
... 63 more
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
reading parameter 'source' of component MyComponent:beandisplay.loop: Property
'model' (within property expression 'model.propertyNames', of
org.apache.tapestry5.corelib.components.beandisp...@10290442) is null. [at
classpath:org/apache/tapestry5/corelib/components/BeanDisplay.tml, line 4]
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:516)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:496)
at
org.apache.tapestry5.corelib.components.Loop._$read_parameter_source(Loop.java)
at
org.apache.tapestry5.corelib.components.Loop.setupForVolatile(Loop.java:358)
at org.apache.tapestry5.corelib.components.Loop.access$100(Loop.java:44)
at org.apache.tapestry5.corelib.components.Loop$2.execute(Loop.java:75)
at org.apache.tapestry5.corelib.components.Loop$2.execute(Loop.java:79)
at
org.apache.tapestry5.corelib.components.Form.executeStoredActions(Form.java:480)
... 73 more
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Property
'model' (within property expression 'model.propertyNames', of
org.apache.tapestry5.corelib.components.beandisp...@10290442) is null. [at
classpath:org/apache/tapestry5/corelib/components/BeanDisplay.tml, line 4]
at
org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:62)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:510)
... 80 more
Caused by: java.lang.NullPointerException: Property 'model' (within property
expression 'model.propertyNames', of
org.apache.tapestry5.corelib.components.beandisp...@10290442) is null.
at
org.apache.tapestry5.internal.services.PropertyConduitSourceImpl.nullTerm(PropertyConduitSourceImpl.java:1256)
at $PropertyConduit_12622d290ec.navigate($PropertyConduit_12622d290ec.java)
at $PropertyConduit_12622d290ec.get($PropertyConduit_12622d290ec.java)
at
org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:58)
... 81 more
> NPE in BeanDisplay if used in a form with a default model
> ---------------------------------------------------------
>
> Key: TAP5-311
> URL: https://issues.apache.org/jira/browse/TAP5-311
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.0.15
> Reporter: Dan Adams
> Priority: Minor
>
> Create something like this:
> <t:form>
> <t:beandisplay object="foo" include="bar" />
> </t:form>
> and submit the form. You get a NPE in beandisplay. The workaround is to
> create the model yourself.
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