Chapter 15 Head First - DailyAdviceClient and DailyAdviceService

[Douglas Carvalho]

Hello!! I just wrote both code of DailyAdvice program and compiled both without errors. But when I try to execute the server I got this:

Exception in thread "main" java.lang.NoClassDefFoundError: DailyAdviceServer/jav
a
Caused by: java.lang.ClassNotFoundException: DailyAdviceServer.java
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: DailyAdviceServer.java. Program will exit.

The same thing happen when I execute my DailyAdviceClient.class

The program works fine on netbeans though...but on prompt ....

The two codes are like this:

 import java.io.*;
import java.net.*;

public class DailyAdviceServer{

   String [] adviceList = {"Morda pedaços menores", "Use o Jeans apertado. Não, ele não faz você parecer gorda",
                            "Só vou dizer uma palavra: inapropriado","Pelo menos hoje, seja honesto. Diga a seu chefe oque realmente pensa", 
"Reconsidere esse corte de cabelo"}; 
//I am Brazilian, so i got a portuguese version of head first.

   public void go(){

      try{

         ServerSocket servSock = new ServerSocket(4242);
         
         while(true){

            Socket sock = servSock.accept();

            PrintWriter writer = new PrintWriter(sock.getOutputStream());
            String advice = getAdvice();
            writer.println(advice);
            writer.close();
            System.out.println(advice);


         }//fim do while


      }
      catch(IOException ex){

         ex.printStackTrace();

      }


   }//fim do método go

   private String getAdvice(){

     int random = (int) (Math.random() * adviceList.length);
     return adviceList[random];


   }//fim do método getAdvice

   public static void main(String[] args)
   {

      DailyAdviceServer server = new DailyAdviceServer();
      server.go();

   }//fim do main


}//fim da classe DailyAdviceServer   

And:

 import java.io.*;
import java.net.*;

public class DailyAdviceClient{

   public void go(){

      try{
     
         Socket s = new Socket("127.0.0.1",4242);

         InputStreamReader input = new InputStreamReader(s.getInputStream());
         BufferedReader reader = new BufferedReader(input);

         String advice = reader.readLine();
         System.out.println("Today you should: " + advice);

         reader.close();


         }
         catch(IOException ex){

            ex.printStackTrace();
         }


   }//fim do método go

  
   public static void main(String[] args){

      DailyAdviceClient client = new DailyAdviceClient();
      client.go();

   }


}   

What am i doing wrong???

[Henry Wong]

Exception in thread "main" java.lang.NoClassDefFoundError: DailyAdviceServer/java
Caused by: java.lang.ClassNotFoundException: DailyAdviceServer.java
at java.net.URLClassLoader$1.run(Unknown Source)

It looks like you ran ....

java DailyAdviceServer.java

Instead of....

java DailyAdviceServer



Henry

[Douglas Carvalho]

Oh, that´s right!!! It just past midnight..... so I was using the arrows of keyboard so the command should turn this:

javac DailyAdviceServer.java

to this

java DailyAdviceServer

but I forgor to delete the .java ..... Thank you very much!! It worked fine now....