Question

I have a duplicated configuration file under WEB-INF directory, called configDEV.properties and configPRO.properties (one for development environment, and the other for production environment).

I load the proper file thanks to these Spring declaration and this Tomcat launch parameter:

<context:property-placeholder 
        location="WEB-INF/config${project.environment}.properties" />

-Dproject.environment=PRO
(or –Dproject.environment=DEV)

Then, in a servlet listener (called StartListener) I do the following, in order to allow JSF to access these properties, in the managed beans, and in the jsp views. (In concrete, we are going to play with a property called cfg.skin.richSelector).

public class StartListener implements ServletContextListener {

    public void contextInitialized(ServletContextEvent sce) {
        //Environment properties
        Map<String, String> vblesEntorno = System.getenv();

        //Project properties
        String entorno = vblesEntorno.get("project.environment");
        String ficheroPropiedades = "/WEB-INF/config" + entorno + ".properties";
        try {
            Properties props = new Properties();
            props.load(sc.getResourceAsStream(ficheroPropiedades));

            setSkinRichSelector(sc, props.getProperty("cfg.skin.richSelector"));
        } catch (Exception e) {
            //...
        }
    }

    private void setSkinRichSelector(ServletContext sc, String skinRichSelector) {
        sc.setInitParameter("cfg.skin.richSelector", skinRichSelector); 
    }

    public void contextDestroyed(ServletContextEvent sce) {}

}

In a JSF managed bean:

public class ThemeSwitcher implements Serializable {

    private boolean richSelector;

    public ThemeSwitcher() {

        richSelector = Boolean.parseBoolean(
            FacesContext.getCurrentInstance().getExternalContext().getInitParameter("cfg.skin.richSelector"));

        if (richSelector) {
            //do A
        } else {
            //do B
        }

    }

    //getters & setters

}

In a xhtml page:

<c:choose>
    <c:when test="#{themeSwitcher.richSelector}">
        <ui:include src="/app/comun/includes/themeSwitcherRich.xhtml"/>
    </c:when>
    <c:otherwise>
        <ui:include src="/app/comun/includes/themeSwitcher.xhtml"/>
    </c:otherwise>
</c:choose>

All of this WORKS OK, but I want to ask the experts if it is the most suitable way to do that, or if this could be simplified in some way???

Thanks in advance for your hints and advices

Answer 1

It depends on which version of Spring you are using. If it happens to be newest Spring 3.1, you can take advantage of @Profile:

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