Why is it not working?

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JSF

I am learning JSF and i decided to do a login with the help of a text file, now i am faced with this problem. when i click the login button on the JSF page, nothing happens.... i would like to know why

THIS IS MY JSF LOGIN PAGE

<pre lang="HTML"> <h:form>
    <p>Please type your user name: 
    <h:inputText size="15" value="#{register.username}"/> </p>
    <p>Please type your password: 
    <h:inputText size="15" value="#{register.password}" />
<pre lang="xml"><h:outputLabel value="#{register.Error}"/></p>
    <p>
        <h:commandButton action="#{register.read()}" value="Submit"/>
    <h:commandButton type="reset" value="Reset"/></p>
        </h:form>     

<pre lang="text">HERE IS MY METHOD FROM THE "register" MANAGED BEAN

public void read(){

        try{

                FileInputStream fstream = new FileInputStream(filepath);
                DataInputStream in = new DataInputStream(fstream);
                BufferedReader br = new BufferedReader(new InputStreamReader(in));
                String strLine;
                String strLine2;
                strLine = br.readLine();
                user=strLine;

      while ((strLine2 = br.readLine()) != null)   {

               pass=strLine2;

  }

  in.close();

    }catch (Exception e){
  System.err.println("Error: " + e.getMessage());
  }

  }


AND THIS MY VALIDATION METHOD

public void validateUser(){

       if(user == null ? username == null : user.equals(username)) {

           validatePass();

       }
       else{

            Error="incorrect username";
       }

    }

    public void validatePass(){

    if( pass.equals(password)){

                    success();
           }
           else{
               Error= "incorrect password"
           }
}