How JSF el expression works and when a JSF variabl

问题:

I am in a bit confusion.

That's how a JSF EL will work and how variable resolver involved while evaluating expressions like.

<h:outputlabel value="#{text.value}"/>

or

<h:outputlabel value="#{text['value']}"/>

Text refers to bundle var arg and value is the key in properties file.

Help me in understanding the evaluation of above expression when reading a property value from message properties.

Thanks in advance.

Regards, Ganesh karanam

回答1:

JSF uses Unified EL for evaluating expressions. The specification uses ELResolvers to determine the value of variables referenced in the expression.

The 'text' variable is likely getting stored in a standard scope (page, request, session, or application). The ScopedAttributeELResolver handles looking up objects from these scopes. The object returned by the ELResolver for 'text' variable is then used as the base for resolving the 'value' property.

There is a ResourceBundleELResolver that knows how to access objects contained within a ResourceBundle. The ResourceBundleELResolver will handle the looking up the 'value' property of the 'test' variable.