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https://issues.jboss.org/browse/RF-10170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575694#comment-12575694
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Martin Kočí commented on RF-10170:
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As I can remember, we have similiar problem in Trinidad renderkit. There was a
long discussion about this problem and the result is that EL is a litte
schizoid in way of handling expression evaluations:
ValueExpression.getValue() throws PropertyNotFoundException only if the last
part of expression does not exist: #{bean.firstProperty.secondProperty} throws
PNFE only if bean.firstProperty resolves to not-null and secondProperty is not
present at resolved object. If bean.firstProperty resolves to null, it returns
null
ValueExpression.getType() throws PNFE even if #{bean} exists, has property
'firstProperty', but this property value is null.
But JavaDoc for both methods says: "PropertyNotFoundException - if one of the
property resolutions failed because a specified variable or property does not
exist or is not readable."
It can also depend on EL implementation used: I used implementation from
http://java.net/projects/uel/.
> Improve Converter finding if EL expression is semi-resolvable
> -------------------------------------------------------------
>
> Key: RF-10170
> URL: https://issues.jboss.org/browse/RF-10170
> Project: RichFaces
> Issue Type: Enhancement
> Security Level: Public(Everyone can see)
> Components: compatibility
> Affects Versions: Future_4.X
> Environment: RichFaces 4 svn rev. 20933
> Reporter: Martin Kočí
> Assignee: Konstantin Mishin
> Fix For: Future_4.X
>
>
> example (#{bean.propertyNull} resolves to null):
> <h:inputText value="#{bean.propertyNull.zeitangabe}" /> outputs a input field
> <r:calendar value="#{bean.propertyNull.zeitangabe}" /> throws
> value="#{bean.propertyNull.zeitangabe}": Target Unreachable, 'propertyNull'
> returned null
> Problem is in org.richfaces.component.util.SelectUtils.findConverter: method
> tries to locate a Converter even if informations for this are "uknown".
> Simple solution can be: find converter only for ValueExpression which leads
> to not null value, because if no value for "value" ValueExpression :), then
> no conversion getAsString is necessary (at least is is true if spec does not
> mandates conversion for null value).
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