How to retrieve FacesContext with Java 17, Spring 6, Jakarta Server Faces 4.x and PrimeFaces 12?

Question

I am trying to migrate my JSF + PrimeFaces (UI) + Spring application from Java 8 to Java 17, whilst also migrating Spring version to 6. For this to work, there is a need to move from the javax libraries to jakarta libraries. jsf-api and jsf-impl of com.sun.faces are removed. Keeping only org.glassfish:jakarta.faces. Did add required libraries from different sources available on the internet.

The problem where I am stuck is that FacesContext facesContext = FacesContext.getCurrentInstance(); was used in a @PostConstruct annotated method of a bean that is @ViewScoped and is used with @Named annotation.

I am getting the exception since facesContext is null, the object of facesContext is not getting initialised.

FacesConfig.xml

<?xml version="1.0" encoding="UTF-8"?>

<faces-config xmlns="https://jakarta.ee/xml/ns/jakartaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-facesconfig_4_0.xsd"
              version="4.0">



    <application>

        <locale-config>
            <default-locale>en</default-locale>
            <supported-locale>en</supported-locale>
        </locale-config>
        <resource-bundle>
            <base-name>messages</base-name>
            <var>msg</var>
        </resource-bundle>

        <el-resolver>
            org.springframework.web.jsf.el.SpringBeanFacesELResolver
        </el-resolver>
    </application>

</faces-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="6.0"
         xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd">

    <display-name>controlfwk</display-name>
    <description>controlfwk</description>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath*:spring-context.xml
        </param-value>
    </context-param>

    <context-param>
        <param-name>spring.profiles.default</param-name>
        <!--<param-value>${spring.profile}</param-value>-->
        <param-value>prod</param-value>
    </context-param>

    <context-param>
        <param-name>resteasy.scan</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <param-name>resteasy.resources</param-name>
        <param-value>
            com.abc.def.cfk.web.service.rest.RestService
        </param-value>
    </context-param>

    <context-param>
        <param-name>resteasy.servlet.mapping.prefix</param-name>
        <param-value>/rest</param-value>
    </context-param>

    <context-param>
        <param-name>primefaces.FONT_AWESOME</param-name>
        <param-value>true </param-value>
    </context-param>

    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>smoothness</param-value>
    </context-param>

    <session-config>
        <session-timeout>360</session-timeout>
        <cookie-config>
            <path>/</path>
        </cookie-config>
    </session-config>

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>jakarta.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>0</load-on-startup>
    </servlet>


    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <listener>
        <listener-class>
            org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>


    <servlet>
        <servlet-name>resteasy-servlet</servlet-name>
        <servlet-class>
            org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>


    <servlet-mapping>
        <servlet-name>resteasy-servlet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>home.xhtml</welcome-file>
        <welcome-file>index.htm</welcome-file>
    </welcome-file-list>

</web-app>

I tried removing FacesContext as in commented, UI does come up with that but that's not a solution.

I added all Jakarta EE jars that were suggested in different forums but could not make any difference. Replaced ManagedBean with Named and ManagedProperty with Inject annotations.

I am expecting to get FacesContext object for something like:

FacesContext facesContext = FacesContext.getCurrentInstance();
Map<String, String> parameterMap = facesContext.getExternalContext().getRequestParameterMap();

This is just one example of I need FacesContext.

Note: Things did work with Java 8, PrimeFaces 6, JSF 2.2.8-02, Spring 4.x.

Edit: As per the comment given by BalusC, I have removed jakarta.faces-api and added org.glassfish:jakarta.faces.

I am still not getting the FacesContext object. I followed everything mentioned in the duplicate link How to properly install and configure JSF libraries via Maven? provided.