SSL Server Exception: javax.net.ssl.SSLException - exception

Question

I am creating a SSL Server and Client in Java. The point of the program is to mimic a movie theater program. I can establish the connection but when I attempt to "reserve" a seat the program crashes. I get the following error:
Server aborted: javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
This is my Server Code
// SSL Server
import java.net.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.net.ServerSocketFactory;
import javax.net.ssl.SSLServerSocketFactory;
public class SSL_Server {
public static void main(String[] args) {
int port = 2018;
System.setProperty("javax.net.ssl.keyStore","mySrvKeystore");
System.setProperty("javax.net.ssl.keyStorePassword","123456");
ServerSocketFactory ssocketFactory = SSLServerSocketFactory.getDefault();
ServerSocket ssocket = null;
System.out.println("SSL_Server started");
final ExecutorService threadPool = Executors.newCachedThreadPool();
try {
ssocket = ssocketFactory.createServerSocket(port);
InetAddress myIP =InetAddress.getLocalHost();
System.out.println(myIP.getHostAddress());
while(true){
Socket aClient = ssocket.accept();
//create a new thread for every client
threadPool.submit(new SSL_ClientHandler(aClient));
}
}
catch(Exception e) {
System.err.println("Server aborted:" + e);
} finally {
try{
ssocket.close();
} catch (Exception e){
System.err.println("could not close connection properly" + e);
}
}
System.out.println("connection was closed successfully");
}
}
The following is my client code
//SSL Client
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.StringTokenizer;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;
import javax.net.ssl.SSLServerSocketFactory;
import javax.net.ssl.SSLSocketFactory;
public class TCP_Client {
public static void main(String[] args) throws IOException{
// SSL_Client newClient = new SSL_Client();
// Lock lock = new ReentrantLock();
boolean validInput = false;
BufferedReader din;
PrintStream pout;
int port = 2018;
BufferedReader stdinp = new BufferedReader(new InputStreamReader(System.in));
String line = "done";
StringTokenizer st;
String hostname;
String task = "done";
if(args.length>0)
hostname = args[0];
else
hostname = "localhost";
SocketFactory socketFactory = SSLSocketFactory.getDefault();
//Socket socket = socketFactory.createSocket(hostname, port);
while(true)
{
try{
//read input
while(!validInput)
{
System.out.println("Please enter a valid command or 'done' to finish.");
line = stdinp.readLine();
st = new StringTokenizer(line);
task = st.nextToken();
if(task.equals("reserve") || task.equals("search") || task.equals("delete") || task.equals("getinfo") || task.equals("done"))
{
validInput =true;
break;
}
System.out.println("Invalid command. Please enter another command or 'done' to escape.");
}
if(task.equals("done"))
{
break;
}
validInput = false;//reset for next line read in
//create a new socket every time
//Socket socket = new Socket(hostname, port);
Socket socket = socketFactory.createSocket(hostname, port);
din = new BufferedReader (new InputStreamReader (socket.getInputStream()));
pout = new PrintStream (socket.getOutputStream());
pout.println(line);
pout.flush();
//print out response from server
System.out.println(din.readLine());
} catch (Exception e){
System.err.println("Server aborted: " + e);
}
}
}
}

Answer 1

"Unable to find valid certification path to requested target" means that your truststore doesn't trust the server certificate. Import it into your truststore, or have it signed by a recognized CA.