eofexception on the server side of sslsocket while there is data for sure - sockets

Question

I have this dummy program:
package com.company;
import javax.net.ssl.*;
import java.io.*;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;
import java.security.*;
import java.security.cert.CertificateException;
class MyClass implements Serializable
{
private int i,j;
public MyClass(int i, int j)
{
this.i = i;
this.j = j;
}
public int getJ()
{
return j;
}
public void setJ(int j)
{
this.j = j;
}
public int getI()
{
return i;
}
public void setI(int i)
{
this.i = i;
}
}
class SSLContextHelper
{
static SSLContext createSSLContext(String path) throws KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, IOException, KeyManagementException, CertificateException
{
KeyStore keyStore = KeyStore.getInstance("PKCS12");
keyStore.load(new FileInputStream(path),"DSL2137976".toCharArray());
// Create key manager
KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
keyManagerFactory.init(keyStore, "DSL2137976".toCharArray());
KeyManager[] km = keyManagerFactory.getKeyManagers();
// Create trust manager
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance("SunX509");
trustManagerFactory.init(keyStore);
TrustManager[] tm = trustManagerFactory.getTrustManagers();
// Initialize SSLContext
SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
sslContext.init(km, tm, new SecureRandom());
return sslContext;
}
}
class ServerThread extends Thread
{
ServerSocket server;
Socket client;
ObjectOutputStream out;
ObjectInputStream in;
boolean issecure;
SSLContext sslContext;
public ServerThread(int port, boolean issecure) throws IOException, UnrecoverableKeyException, CertificateException, NoSuchAlgorithmException, KeyStoreException, KeyManagementException
{
this.issecure=issecure;
client=null;
if(issecure)
{
sslContext = SSLContextHelper.createSSLContext("/usr/lib/jvm/java-8-openjdk/jre/lib/security/ssltest");
SSLServerSocketFactory sslServerSocketFactory = sslContext.getServerSocketFactory();
server = sslServerSocketFactory.createServerSocket(port);
server.setSoTimeout(200);
}
else
server=new ServerSocket(port);
}
#Override
public void run()
{
while (true)
{
try
{
if(client==null)
{
if (issecure)
{
SSLSocket clientssl = (SSLSocket) server.accept();
clientssl.setEnabledCipherSuites(clientssl.getSupportedCipherSuites());
clientssl.startHandshake();
client = clientssl;
}
else
client = server.accept();
in = new ObjectInputStream(client.getInputStream());
out = new ObjectOutputStream(client.getOutputStream());
client.setSoTimeout(200);
}
String[] req = in.readUTF().split("\n");
out.writeUTF("hello I'm the server");
out.flush();
req = in.readUTF().split("\n");
out.writeUTF("I mean I'll serve you");
out.flush();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
public class Main
{
public static void main(String... args) throws IOException, ClassNotFoundException, UnrecoverableKeyException, CertificateException, NoSuchAlgorithmException, KeyStoreException, KeyManagementException
{
ServerThread serverThread=new ServerThread(14200, true);
serverThread.setDaemon(true);
serverThread.start();
ServerThread mail=new ServerThread(14201, false);
mail.setDaemon(true);
mail.start();
try
{
Thread.sleep(5000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
SSLSocket client=(SSLSocket)SSLContextHelper.createSSLContext("/usr/lib/jvm/java-8-openjdk/jre/lib/security/ssltest").getSocketFactory().createSocket();
client.connect(new InetSocketAddress("localhost",14200),5000);
Socket mailclient = new Socket();
mailclient.connect(new InetSocketAddress("localhost", 14201), 5000);
client.startHandshake();
client.setSoTimeout(5000);
ObjectOutputStream out = new ObjectOutputStream(client.getOutputStream());
ObjectInputStream in = new ObjectInputStream(client.getInputStream());
out.writeUTF("hello\nhow are you");
out.flush();
System.out.println(in.readUTF());
out.writeUTF("what\nI didn't understand");
out.flush();
System.out.println(in.readUTF());
int i=0;
while (i<=1)
{
try
{
try
{
Thread.sleep(10000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
out.writeUTF("hello\nhow are you");
out.flush();
System.out.println(in.readUTF());
out.writeUTF("what\nI didn't understand");
out.flush();
System.out.println(in.readUTF());
i++;
}
catch (SocketTimeoutException ignored)
{
}
}
}
}
It's just a simulation of a real program I have, the Thread.sleep on the client side is a simulation of a user doing some interaction with the system before clicking a button(the first sleep is the simulation of the user putting the sign in information, the second sleep is the user opening tab,clicking link,answers dialogs,etc).
Unfortunately I'm getting EOFException in the server side right after the server.accept succeed(that is when the client connects).
I know that this exception occurs when there is no data to get but this happens even after these two lines(the first ones before the while loop) on the client side:
out.writeUTF("hello\nhow are you");
out.flush();
after these two lines the client waits 5 seconds(the timeout I put) , during this 5 seconds the server keeps on its EOFException, when the timeout finishes the client gets SocketTimeoutException and the program exits.
The original program is getting the same EOFException on the server side, it began when I moved to SSLSockets.
So what's the issue here ?
Edit
I have found that when I remove the timeout(the Read timeout not the Accept timeout) it works perfectly.
Playing with the timeout, setting it to different value gives me strange NullPointerExceptions(that in is null !!!!!!!!!!).
I need the timeout because in my real program the server won't wait the client forever, it has other clients to serve as well .
Why timeout causes this ?