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Date: Fri, 27 Feb 2009 19:32:59 +0100
From: se08m041@technikum-wien.at
To: dev@myfaces.apache.org
Subject: [ExtVal] + facelets - EL syntax issue?
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Hello,

I'm sorry if this ends up in the wrong place, i'm new to this.
I encountered a problem as i tried to use extval together with facelets

extval 1.1.1
facelets 1.1.14

The Problem concerns the DefaultELHelper and a special case of EL usage=20
in custom facelet tags.

I am using custom composition tags in facelets like shown in this IBM=20
article by Richard Hightower:
http://www.ibm.com/developerworks/java/library/j-facelets/#N102EF

custom tag inside a facelet:

<my:customTag entity=3D"#{viewBean}" fieldName=3D"address" />

(the viewBean has an address property)


custom tag source:

<ui:composition>

=09<h:selectOneMenu id=3D"#{fieldName}_input" value=3D"#{entity[fieldName]}"=
 >
=09=09<f:selectItem ... />
=09=09...
=09</h:selectOneMenu>

</ui:composition>

Problem and StackTrace:

fieldName contains the String "address", which is what we want to be evaluat=
ed
so we cant put the '' around the fieldName

ValueBindingExpression =3D "#{entity[fieldName]}"

result value =3D "entity[address]"

=3D> no '' around address

code line 93:
int index1 =3D expression.lastIndexOf("']");

=09expression does not contain '] but it contains ]
=09therefore index1 and index2 are -1 and the else branch is executed
=09which does not set base, so it remains null
=09finally this leads to an exception

Daemon Thread [http-8080-2] (Suspended (breakpoint at line 93 in=20
ValueBindingExpression))
=09ValueBindingExpression.<init>(String) line: 93
=09DefaultELHelper.getValueBindingExpression(UIComponent, boolean) line: 104
=09DefaultELHelper.getPropertyDetailsOfValueBinding(UIComponent) line: 138
=09DefaultComponentMetaDataExtractor.extract(FacesContext, Object) line: 85
=09ValidationInterceptorWithSkipValidationSupport(ValidationInterceptor).ini=
tComponent(FacesContext, UIComponent) line:=20
74
=09ValidationInterceptorWithSkipValidationSupport(ValidationInterceptor).bef=
oreEncodeBegin(FacesContext, UIComponent, Renderer) line:=20
53
=09ExtValGenericRendererWrapper(ExtValRendererWrapper).encodeBegin(FacesCont=
ext,=20
UIComponent) line: 208
=09ExtValGenericRendererWrapper.intercept(Object, Method, Object[],=20
MethodProxy) line: 71
=09HtmlMenuRenderer$$EnhancerByCGLIB$$ba4b3ba9.encodeBegin(FacesContext,=20
UIComponent) line: not available
=09HtmlSelectOneMenu(UIComponentBase).encodeBegin(FacesContext) line: 746
=09ComponentSupport.encodeRecursive(FacesContext, UIComponent) line: 242
=09ComponentSupport.encodeRecursive(FacesContext, UIComponent) line: 249
=09ComponentSupport.encodeRecursive(FacesContext, UIComponent) line: 249
=09FaceletViewHandler.renderView(FacesContext, UIViewRoot) line: 594
=09AjaxViewHandler(ViewHandlerWrapper).renderView(FacesContext,=20
UIViewRoot) line: 101
=09AjaxViewHandler.renderView(FacesContext, UIViewRoot) line: 222
=09RenderResponseExecutor.execute(FacesContext) line: 41
=09LifecycleImpl.render(FacesContext) line: 146
=09FacesServlet.service(ServletRequest, ServletResponse) line: 147
=09ApplicationFilterChain.internalDoFilter(ServletRequest,=20
ServletResponse) line: 290
=09ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 20=
6
=09AuthorizationFilter.doFilter(ServletRequest, ServletResponse,=20
FilterChain) line: 97
=09ApplicationFilterChain.internalDoFilter(ServletRequest,=20
ServletResponse) line: 235
=09ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 20=
6
=09ExtensionsFilter.doFilter(ServletRequest, ServletResponse,=20
FilterChain) line: 246
=09ApplicationFilterChain.internalDoFilter(ServletRequest,=20
ServletResponse) line: 235
=09ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 20=
6
=09EncodingFilter.doFilter(ServletRequest, ServletResponse, FilterChain)=20
line: 22
=09ApplicationFilterChain.internalDoFilter(ServletRequest,=20
ServletResponse) line: 235
=09ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 20=
6
=09ExtensionsFilter(ExtensionsFilter).doFilter(ServletRequest,=20
ServletResponse, FilterChain) line: 301
=09ApplicationFilterChain.internalDoFilter(ServletRequest,=20
ServletResponse) line: 235
=09ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 20=
6
=09StandardWrapperValve.invoke(Request, Response) line: 233
=09StandardContextValve.invoke(Request, Response) line: 191
=09StandardHostValve.invoke(Request, Response) line: 128
=09ErrorReportValve.invoke(Request, Response) line: 102
=09StandardEngineValve.invoke(Request, Response) line: 109
=09CoyoteAdapter.service(Request, Response) line: 286
=09Http11AprProcessor.process(long) line: 857
=09Http11AprProtocol$Http11ConnectionHandler.process(long) line: 565
=09AprEndpoint$Worker.run() line: 1509
=09Thread.run() line: 619

without extval this expression evaluates and works fine, so i guess=20
this is a lack of facelets/EL support.
please correct me if i am wrong, and feel free to kill me if this is=20
not the right place to report such a problem.

kind regards,
thomas