JSF calling method with non String parameters

问题

I have in my JSF:

<h:commandButton value="Add to Cart"
    rendered="#{movieDisplayController.movie.available != 0}"
    action="#{cartController.addMovie(movieDisplayController.movie, '2')}">
</h:commandButton>

The action is underlined in red in eclipse (kepler JEE) and displays:

Method must have signature "String method(), String method(), String method(String), String method(String, String), String method(String, String, String), String method(String, String, String, String), String method(String, String, String, String, String), String method(String, String, String, String, String, String), String method(String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String), String method(String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String, String)" but has signature "String method(Movie, Integer)"

The method is defined as :

public String addMovie(Movie movie, Integer quantity) {
    //...
    return null;
}

It runs correctly when I hit the button - is it a bug in eclipse or am I doing something wrong ?

EDIT: runs also correctly with :

action="#{cartController.addMovie(movieDisplayController.movie, 2)}">

and

action="#{cartController.addMovie(movieDisplayController.movie,
    movieDisplayController.quantity)}">

too so reported

回答1:

Quoting @BalusC in Passing parameter to JSF action

When you're targeting a Servlet 3.0 container (Tomcat 7, Glassfish 3, JBoss AS 6, etc) with a web.xml whose root declaration definies Servlet 3.0, then you should be able to just pass the parameter straight into the action method by EL as that's supported by EL 2.2 (which is part of Servlet 3.0).

your way should be completely right, and I guess it's a bug in eclipse kepler.

来源：https://stackoverflow.com/questions/21938029/jsf-calling-method-with-non-string-parameters