How can I put a message in a page after an action in another page?

Hi everybody, I know that what I try to explain is a bit difficult to understand without know all the context but I try to do it the same:). I have a datatable that contains a list of student. In another page I insert a new student. When I click on "save" button I save the new student and I return to the page with the datatable. The problem is: when I add a student I must notify the user that the student is added correctly with a message in the 1st page like "The student is added correctly". This message must display only after I added the student not when I see for the first time the page with the datatable. How can i do this? Thanks to all.

I use your suggestion but it doesn't work. I create a bean named MessageHandler with scope request. In its constructor i put an empty value for the variable addStudent_message, and in the page that the message should be I have this line of code:
<h:outputText rendered="#{!empty messageHandler.addStudent_message}" value="#{messageHandler.addStudent_message}"/>
In the bean I used to add a student I have a MessageHandler object and in the method that add a student, before the return statement, I put this:
handler.setAddStudent_message("Studente aggiunto correttamente");
When I run, it gives me this error:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error calling action method of component with id _idJsp1:save
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:152)
root cause
javax.faces.FacesException: Error calling action method of component with id _idJsp1:save
     org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
     javax.faces.component.UICommand.broadcast(UICommand.java:106)
     javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:94)
     javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:168)
     org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
     org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
root cause
javax.faces.el.EvaluationException: Exception while invoking expression #{addStudentBean.save}
     org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:153)
     org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
     javax.faces.component.UICommand.broadcast(UICommand.java:106)
     javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:94)
     javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:168)
     org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
     org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
root cause
java.lang.NullPointerException
     beanDomain.AddStudentBean.save(AddStudentBean.java:68)
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:585)
     org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
     org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
     javax.faces.component.UICommand.broadcast(UICommand.java:106)
     javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:94)
     javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:168)
     org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
     org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.23 logs.
It seems that it doesn't find the MessageHandler object. What do you think?

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