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https://issues.apache.org/jira/browse/TAPESTRY-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569174#action_12569174
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Daniel Caldeweyher commented on TAPESTRY-2157:
----------------------------------------------
If i understand correctly OGNL has undergone significant changes and no longer
just evaluates the expression on demand but generates byte code and enhanced
the pageclass during the first loading of the page. If my understanding is
correct, then the problem might be its intregration into tapestry with ognl
possibly generate byte code for a reference to the actual page object instead
of the getPage() method of the component. This would explain the error message
"$Page2_15 cannot be cast to $Page1_14"
Daniel
> ClassCastException in ExpressionBinding.setObject
> -------------------------------------------------
>
> Key: TAPESTRY-2157
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2157
> Project: Tapestry
> Issue Type: Bug
> Components: Framework
> Affects Versions: 4.1.5
> Environment: Win XP, Tomcat 5.5
> Reporter: Paul Stanton
> Assignee: Jesse Kuhnert
> Priority: Critical
> Attachments: Problem.war
>
>
> I've been using this page structure for quite some time and it seems after
> upgrading to 4.1.5 from 4.1.1 something has regressed. It appears my
> BorderTab component is caching the page or page class when it shouldn't?
> essentially, i have a border component which wraps the bodyContent in a
> generic Form component. Inside this form (yet still inside the Border) i have
> some BorderTab components, each with a LinkSubmit component. Clicking these
> links navigates through the tabs, submitting their forms (empty in the
> example).
> Please run the attached example war file, it includes everything.
> 1. click tab 1, tab 2, tab 3 etc - eventually the ClassCastException will be
> shown.
> note: clicking tab 1 recursively without clicking the other tabs does not
> cause the exception
> Exception message:
> Unable to update OGNL expression '<parsed OGNL expression>' of [EMAIL
> PROTECTED]/$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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