I'm trying to learn JSF and EL and I am facing the following error:
/index.xhtml @20,120 actionListener="#{contatosController.adicionar(actionEvent)}" Q
What does that mean and how can I solve it?
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It means that your environment does not support the EL 2.2 feature of invoking methods with arguments. The EL syntax #{bean.method(argument)} is unsupported in EL 2.1 and older and therefore unparsable. Just get rid of that argument. JSF fills it in by itself anyway.
actionListener="#{contatosController.adicionar}"
Please note that even if you upgraded to EL 2.2, it would still end up in trouble as you're essentially passing null to it (you don't have a managed bean #{actionEvent}, right?). You should actually never need to specify the default argument of a JSF (action)listener method yourself.
