C socket server, Java socket client : BLOCKING!

I am pasting my code for a simple socket server in C and a Java client.

I use write method sending character by character in Java. However after the chunk of characters are sent(here, 'h', 'e', 'y') , the Java client is send blocked as the C server does not reply to it :(

I am assuming there is some problem with sending a null character(from the Java write) that would stop the recv at the C side.

Any help would be greatly appreciated.

C server:

#include <stdio.h>   /* standard in and output*/
#include <sys/socket.h> /* for socket() and socket functions*/
#include <arpa/inet.h>  /* for sockaddr_in and inet_ntoa() */
#include <stdlib.h>    
#include <string.h>     
#include <unistd.h>     /* for close() */


int main(int argc, char *argv[]){
 int sock, connected, bytes_received, true = 1;  
    char recv_data;      
 char replyBuffer[32];

    struct sockaddr_in server_addr,client_addr;    
    int sin_size;       
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("Socket");
        exit(1);
    }

    if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1) {
        perror("Setsockopt");
        exit(1);
    }

    server_addr.sin_family = AF_INET;         
    server_addr.sin_port = htons(2400);     
    server_addr.sin_addr.s_addr = INADDR_ANY; 
    bzero(&(server_addr.sin_zero),8); 

    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("Unable to bind");
            exit(1);
    }

    if (listen(sock, 5) == -1) {
        perror("Listen");
        exit(1);
    }

 printf("\nTCPServer Waiting for client on port 2400");

   while(1){  
        sin_size = sizeof(client_addr);
        connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size);
        printf("\n Got a connection from (%s , %d)",inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));


       while ((bytes_received = recv(connected,&recv_data,1,0)) > 0){
  printf("\nrecv= %c\n", recv_data);
  }
  int success = 1;
  sprintf(replyBuffer, "%d", success); 
  printf("reply buffer = %s\n", replyBuffer);
  if (send(connected, replyBuffer, strlen(replyBuffer), 0) == -1)
    perror("send() failed"); 
    success = 0;
  close(connected);
 }
}

Java Client:

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

public class Client1
{
 public static void main(String[] args) throws IOException {
  if (args.length < 2) {
   System.err.println("Usage: java Client1 <IP address> <Port number>");
   System.exit(0);
  }
  BufferedReader in = null;
  OutputStream out = null;
  Socket sock = null;

  try {
   sock = new Socket(args[0], Integer.parseInt(args[1]));
   out = sock.getOutputStream();
   in = new BufferedReader(new InputStreamReader(sock.getInputStream()));

    String line = "hey";
    String responseline = null;
char[] strArray;
strArray = line.toCharArray();

while (true) {
for( int index = 0; index < strArray.length; index++){
 out.write(strArray[index]);
}
out.flush();
System.out.println("data sent " );
System.out.println("val returned"+in.readLine());
   }
  }
  catch (IOException ioe) {
   System.err.println(ioe);
  }
  finally {
   if (in != null)
    in.close();

   if (out != null)
    out.close();
   if (sock != null)
    sock.close();
  }
 }
}