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https://issues.apache.org/jira/browse/TAPESTRY-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569170#action_12569170
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paul.stanton edited comment on TAPESTRY-2157 at 2/14/08 7:52 PM:
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daniel, thanks! this solved it:
"ognl:pageName==page.pageName" -> "ognl:samePage"
"ognl:page.nextPage" -> "ognl:nextPage"
with relevant accessors.
so then the bug is with tapestry or ognl? i think maybe tapestry:
the page.nextPage call is what is causing the problem, when tapestry tries to
resolve the expression in subsequent hits, it is caching the type of the object
described by 'page'. this then throws a ClassCastException because the current
'page' is not of the same type as the cached 'page'.
anyway, it works and obviously no one else is bumping up against it! so i'm
happy.
p.
was (Author: paul.stanton):
daniel, thanks! this solved it:
"ognl:pageName==page.pageName" -> "ognl:samePage"
"ognl:page.nextPage" -> "ognl:nextPage"
with relevant accessors.
> ClassCastException in ExpressionBinding.setObject
> -------------------------------------------------
>
> Key: TAPESTRY-2157
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2157
> Project: Tapestry
> Issue Type: Bug
> Components: Framework
> Affects Versions: 4.1.5
> Environment: Win XP, Tomcat 5.5
> Reporter: Paul Stanton
> Assignee: Jesse Kuhnert
> Priority: Critical
> Attachments: Problem.war
>
>
> I've been using this page structure for quite some time and it seems after
> upgrading to 4.1.5 from 4.1.1 something has regressed. It appears my
> BorderTab component is caching the page or page class when it shouldn't?
> essentially, i have a border component which wraps the bodyContent in a
> generic Form component. Inside this form (yet still inside the Border) i have
> some BorderTab components, each with a LinkSubmit component. Clicking these
> links navigates through the tabs, submitting their forms (empty in the
> example).
> Please run the attached example war file, it includes everything.
> 1. click tab 1, tab 2, tab 3 etc - eventually the ClassCastException will be
> shown.
> note: clicking tab 1 recursively without clicking the other tabs does not
> cause the exception
> Exception message:
> Unable to update OGNL expression '<parsed OGNL expression>' of [EMAIL
> PROTECTED]/$Border.$BorderTab_1] to Page3: $Page2_15 cannot be cast to
> $Page1_14
> stack trace:
> $ASTChain_118168cf864.set($ASTChain_118168cf864.java)
> org.apache.tapestry.services.impl.ExpressionEvaluatorImpl.write(ExpressionEvaluatorImpl.java:179)
>
> $ExpressionEvaluator_118168cf818.write($ExpressionEvaluator_118168cf818.java)
> org.apache.tapestry.binding.ExpressionBinding.setObject(ExpressionBinding.java:224)
>
> $LinkSubmit_9.setSelected($LinkSubmit_9.java)
> org.apache.tapestry.form.AbstractSubmit.handleClick(AbstractSubmit.java:69)
> org.apache.tapestry.form.AbstractSubmit.rewindFormComponent(AbstractSubmit.java:63)
>
> org.apache.tapestry.form.AbstractFormComponent.renderComponent(AbstractFormComponent.java:90)
>
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187)
>
> org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538)
> org.apache.tapestry.components.ElseBean.renderComponent(ElseBean.java:47)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187)
>
> org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:107)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187)
>
> org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538)
> org.apache.tapestry.components.IfBean.renderComponent(IfBean.java:94)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187)
>
> org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:538)
> org.apache.tapestry.form.FormSupportImpl.rewind(FormSupportImpl.java:624)
> org.apache.tapestry.form.Form.renderComponent(Form.java:196)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:724)
> org.apache.tapestry.services.impl.DefaultResponseBuilder.render(DefaultResponseBuilder.java:187)
>
> org.apache.tapestry.form.Form.rewind(Form.java:269)
> org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycle.java:469)
> org.apache.tapestry.form.Form.trigger(Form.java:280)
> org.apache.tapestry.engine.DirectService.triggerComponent(DirectService.java:166)
>
> org.apache.tapestry.engine.DirectService.service(DirectService.java:142)
> $IEngineService_118168cf76b.service($IEngineService_118168cf76b.java)
> org.apache.tapestry.services.impl.EngineServiceOuterProxy.service(EngineServiceOuterProxy.java:72)
>
> org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:241)
> org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:54)
>
> $WebRequestServicer_118168cf742.service($WebRequestServicer_118168cf742.java)
> $WebRequestServicer_118168cf73e.service($WebRequestServicer_118168cf73e.java)
> org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:61)
>
> $ServletRequestServicer_118168cf724.service($ServletRequestServicer_118168cf724.java)
>
> org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55)
>
> $ServletRequestServicerFilter_118168cf720.service($ServletRequestServicerFilter_118168cf720.java)
>
> $ServletRequestServicer_118168cf726.service($ServletRequestServicer_118168cf726.java)
>
> org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:52)
>
> $ServletRequestServicerFilter_118168cf71e.service($ServletRequestServicerFilter_118168cf71e.java)
>
> $ServletRequestServicer_118168cf726.service($ServletRequestServicer_118168cf726.java)
>
> org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53)
>
> $ServletRequestServicerFilter_118168cf722.service($ServletRequestServicerFilter_118168cf722.java)
>
> $ServletRequestServicer_118168cf726.service($ServletRequestServicer_118168cf726.java)
>
> $ServletRequestServicer_118168cf718.service($ServletRequestServicer_118168cf718.java)
>
> org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:126)
> org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:171)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
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