Hi

Thanks for the demo, it helps a lot. I tried th with myfaces and it throws the same exception:

javax.faces.FacesException: java.lang.NullPointerException: name can not be null at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.wrap(ExceptionHandlerImpl.java:241)

at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:156) at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:169) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:96)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.NullPointerException: name can not be null at javax.faces.component.UIComponent.getValueExpression(UIComponent.java:543) at org.apache.myfaces.el.unified.resolver.CompositeComponentELResolver$CompositeComponentAttributesMapWrapper.getExpression(CompositeComponentELResolver.java:208)

at org.apache.myfaces.extensions.validator.core.el.ExtValELResolver.getCompositeComponentExpression(ExtValELResolver.java:277) at org.apache.myfaces.extensions.validator.core.el.DefaultELHelper.getPropertyDetailsOfValueBinding(DefaultELHelper.java:169)

at org.apache.myfaces.extensions.validator.core.metadata.extractor.DefaultComponentMetaDataExtractor.extract(DefaultComponentMetaDataExtractor.java:77) at org.apache.myfaces.extensions.validator.util.ExtValUtils$1.extract(ExtValUtils.java:233)

at org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.getPropertyInformation(AbstractValidationInterceptor.java:176) at org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.processAfterValidation(AbstractValidationInterceptor.java:166)

at org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.beforeGetConvertedValue(AbstractValidationInterceptor.java:153) at org.apache.myfaces.extensions.validator.core.renderkit.ExtValRendererWrapper.getConvertedValue(ExtValRendererWrapper.java:369)

at javax.faces.component.UIInput.getConvertedValue(UIInput.java:578) at javax.faces.component.UIInput.validate(UIInput.java:510) at javax.faces.component.UIInput.processValidators(UIInput.java:240) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1218)

at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1218) at javax.faces.component.UIForm.processValidators(UIForm.java:137) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1218)

at javax.faces.component.UIViewRoot._processValidatorsDefault(UIViewRoot.java:1251) at javax.faces.component.UIViewRoot.access$500(UIViewRoot.java:77) at javax.faces.component.UIViewRoot$ProcessValidatorPhaseProcessor.process(UIViewRoot.java:1298)

at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1207) at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:683) at org.apache.myfaces.lifecycle.ProcessValidationsExecutor.execute(ProcessValidationsExecutor.java:34)

at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:149)

The problem resides in how CompositeComponentELResolver works. In few words, it returns a Map that points to composite component attributes, but this map is traversed by default MapELResolver, not the same CompositeComponentELResolver, so ExtValELResolver wrapper does not receive the control before evaluate and compositeComponentExpressionBase is never set.

The solution should be do something similar to the hack done in FlashELResolver. In that case, the resolver checks if the base is instanceof the map (in myfaces case CompositeComponentAttributesMapWrapper) and if so return the value as MapELResolver does (or in other words as FlashELResolver does).

I have not tested this solution yet but I think it will work. The behavior proposed is not described on jsf 2.0 spec section 5.6.2.2, but I think we can consider it an implementation detail and create a fix on myfaces. Please create an issue on myfaces issue tracker and I'll propose a patch for this one.

regards,