Writing with Server in C++

I am programming a server-client service, the client is in Java and the Server is in C++, but when I try to write by the Server to the Client, he does not sends the message, only when i close the socket, the server sends the message and the client reads it. Here is the Server Code:

#include<stdio.h>
#include<stdlib.h>
#include<sstream>
#include<string>
#include<netdb.h>
#include<netinet/in.h>
#include<string.h>
#include<iostream>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<unistd.h>


using namespace std;

void doprocessing (int sock, int cliente);
void sendM(int socket,int client);

int main(int argc, char *argv[]) {
   int sockfd, newsockfd, portno,cliente;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int n, pid;
   socklen_t clilen;


   sockfd = socket(AF_INET, SOCK_STREAM, 0);

   if (sockfd < 0) {
      perror("ERROR opening socket");
      exit(1);
   }

   bzero((char *) &serv_addr, sizeof(serv_addr));
   portno = 8080;

   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);

   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
      perror("ERROR on binding");
      exit(1);
   }


   listen(sockfd,5);
   clilen = sizeof(cli_addr);
   cout<<"Servidor Iniciado1..."<<endl;

   while (1) {
      newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
      cliente=cliente+1;
      if (newsockfd < 0) {
         perror("ERROR aceptando conexion");
         exit(1);
      }
      /* Create child process */
           pid = fork();

           if (pid < 0) {
              perror("ERROR on fork");
              exit(1);
           }

           if (pid == 0) {

             cout<<"Nueva conexion "<<cliente<<endl;
              close(sockfd);
              doprocessing(newsockfd,cliente);
              exit(0);
           }
           else {
              close(newsockfd);
           }

   }
}

void doprocessing (int sock, int cliente1) {
   int n;
   char buffer1[256];
   bzero(buffer1,256);
   n = read(sock,buffer1,255);
   n=1;
   if (n < 0) {
      perror("ERROR leyendo el socket");
      exit(1);
   }
   cout<<"Mensaje de cliente "<<cliente1<<":"<<buffer1<<endl;
   sendM(sock,cliente1);
   if (n < 0) {
      perror("ERROR escribiendo al socket");
      exit(1);
   }

}

void sendM(int socket, int client){
    std :: string buff;
    int n;
    cout << "\nServidor: ";
    cin >> buff;
    n=send(socket, buff.data(), buff.length(),0);
    cout<<buff.data()<<"\n";
    cout<<n<<endl;
    if(n<0){
            cout<<"Error enviando respuesta"<<endl;
        }
    doprocessing(socket,client);
}

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