Java EE (Java Enterprise Edition) General Discussion

I am trying to pass a parameter through a command link from JSF to backing beans. But when I am trying to get that parameter in my bean it is returning a null value. Please refer the code below.

JSF Coding:

<h:commandLink value="#{searchResults.netid}" action="#{managebean.DeleteConfirmation}">
        <f:param name="netid" value="#{searchResults.netid}" />
  </h:commandLink>

Coding in my bean:

String userid=(String) FacesContext.getCurrentInstance().getExternalContext()
        .getSessionMap().get("netid");

faces-config.xml

<managed-bean>
    <managed-bean-name>managebean</managed-bean-name>
   <managed-bean-class>com.worker.Manager</managed-bean-class>
   <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

When i print the string userid it is showing as null.
Please help me with this issue,