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https://issues.apache.org/jira/browse/MYFACES-3168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736805#comment-13736805
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Ludovic Pénet commented on MYFACES-3168:
----------------------------------------
I also request a reopening of this issue. Without this issue solved (or a work
around provided), one can not easily forge EL expressions for dynamic controls.
I mean, controls dynamically instantiated on a PreRenderViewEvent.
To be able to forge "complex" EL expressions involving a variable passed as a
parameter, I today use a klude that recursively resolve this variable to its
"real" value :
public static String getValueExpressionExpression(ValueExpression
valueExpression) {
return valueExpression.getExpressionString().replace("#{",
"").replace("}", "");
}
public static String getMappedValueExpression(ValueExpression
valueExpression) {
ContextAwareTagValueExpression ctxAware =
(ContextAwareTagValueExpression)valueExpression;
if(ctxAware != null) {
return
getMappedValueExpression((WrappedValueExpression)ctxAware.getWrapped());
}
return getValueExpressionExpression(valueExpression);
}
public static String getMappedValueExpression(WrappedValueExpression
wrappedExpression) {
String exprString =
wrappedExpression.getExpressionString().replace("#{", "").replace("}", "");
String ret = exprString;
try {
Field valueExpression =
WrappedValueExpression.class.getDeclaredField("valueExpression");
valueExpression.setAccessible(true);
ValueExpressionImpl vei = (ValueExpressionImpl)
valueExpression.get(wrappedExpression);
Field varMapper =
ValueExpressionImpl.class.getDeclaredField("varMapper");
varMapper.setAccessible(true);
VariableMapperImpl vmi = (VariableMapperImpl)
varMapper.get(vei);
if(vmi != null) {
String[] components = exprString.split("\\.");
components[0] =
getMappedValueExpression(vmi.resolveVariable(components[0]));
//.getExpressionString().replace("#{", "").replace("}", "");
ret = "";
for(int i = 0 ; i < components.length ; i++) {
if(i != 0) {
ret += ".";
}
ret += components[i];
}
}
} catch (Exception ex) {
logger.error("Exception lors du mapping de l'expression EL " +
exprString, ex);
} finally {
return ret;
}
}
It would be great to have such functionnality available without naughty kludges
like introspection... Maybe a myfaces extension would fit ?
Thanks in advance for your attention.
> Bound attribute values resolve to NULL during PreRenderViewEvent for nested
> composite components
> ------------------------------------------------------------------------------------------------
>
> Key: MYFACES-3168
> URL: https://issues.apache.org/jira/browse/MYFACES-3168
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.0.6, 2.1.0
> Environment: Windows 7 x64 Enterprise.
> JDK 1.6.0_25.
> Eclipse Version: Helios Service Release 2
> Build id: 20110218-0911
> Reporter: MAtthew Sweeney
> Assignee: Leonardo Uribe
> Attachments: ASF.LICENSE.NOT.GRANTED--screenshot-1.jpg,
> jsf-testing-2.zip, jsf-testing-myfaces.zip
>
>
> When nesting custom composite components, any data bound attributes (eg
> #{someValueExpression} ) will resolve to null during the PreRenderViewEvent.
> This only occurs on the second level or deeper nested component (the
> top-level component in the page works fine).
> This same issue occurs on JSF RI 2.0.4, 2.1.x, 2.2.x
> I have an eclipse project for upload that reproduces the problem.
> I have no cause for the issue at this time.
> Cheers,
> Matt
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