Server to Server communication help required.

[hiteshnaika]

Hi Everybody,

I want to establish a communication between Server A to Server B using Server to Server call.

Server A: is apache and holds a website. I am using cURL to initiate a call and to transmit the data.

Server B: is based on Java communication protocol.

Now, my trouble is, even though I am sending the data using cURL with POST method (data is completely secure as its a backend call and cannot be tampered), but Java server is not able to retrieve the data I am sending. Following is the log I received from server which states about the error.

MerchantsLog merchantsLog=new MerchantsLog();
ObjectOutputStream objectoutputstream1 = null;
strHost = request.getRemoteAddr();
strReferer = request.getHeader("Referer")==null?"":request.getH eader("Referer").trim();
try
{
ObjectInputStream inputStream = new ObjectInputStream(request.getInputStream());
VERIFICATION_INPUT = (String)inputStream.readObject();
}


This is the sting we get from your end. VERIFICATION_INPUT

Current Exception :
2012/01/25 15:02:39 | 15:02:39,779 INFO [AllLogs] [----------VERIFICATION_INPUT ENCRYPT----]
2012/01/25 15:02:39 | 15:02:39,779 ERROR [AllLogs] java.io.StreamCorruptedException: invalid stream header
2012/01/25 15:02:39 | java.io.StreamCorruptedException: invalid stream header
2012/01/25 15:02:39 | at java.io.ObjectInputStream.readStreamHeader(ObjectI nputStream.java:764)
2012/01/25 15:02:39 | at java.io.ObjectInputStream.<init>(ObjectInputStream .java:277)
2012/01/25 15:02:39 | at org.apache.jsp.TpslMB_jsp._jspService(TpslMB_jsp.j ava:164)
2012/01/25 15:02:39 | at org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
2012/01/25 15:02:39 | at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
2012/01/25 15:02:39 | at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.jav

I need to get rib of this as this is an urgent matter. Can anybody give me some hints/suggestions to solve this problem. I will be very thankful to you all.

Awaiting your valuable response.

[ander]

My suggestion: Come up with a custom protocol and use raw sockets. Works like a charm.

Here's some simplified code that I wrote for a very similar system: A PHP application communicates with a Java server using sockets.
It's multi-threaded too, and can accept as many connections as you want it to.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;

public class CustomServer {
	public static void main(String[] args) throws Exception {
		ServerSocket m_ServerSocket = new ServerSocket(54321);
		while (true) {
			Socket clientSocket = m_ServerSocket.accept();
			ClientServiceThread cliThread = new ClientServiceThread(clientSocket);
			cliThread.start();
		}
	}
}

class ClientServiceThread extends Thread {
	Socket clientSocket;
	boolean running = true;

	ClientServiceThread(Socket s) {
		clientSocket = s;
	}

	public void run() {
		try {
			BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
			PrintWriter out = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
			while (running) {
				String clientCommand = in.readLine();
				if (clientCommand != null) {
					// Use a switch-case or nested if-else'es with 'clientCommand' to determine what operation needs to be done.
					// Do the magic
					// Send output

					// Example:
					if (clientCommand.equalsIgnoreCase("quit")) {
						running = false; // Stops the current thread and closes the socket
					} else if (clientCommand.equalsIgnoreCase("some-other-command")) {
						// <Insert code for magic here>
						out.println("<Your output goes here>");
						out.flush(); // Just to be sure            
					}
				}
			}
			clientSocket.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

The original program works perfectly, but I didn't test the code that I posted above, so there might be some bugs left.

Credits: I borrowed bits and pieces of code and logic from many sources, so I haven't been able to document or give credit to all of them. But I believe I didn't violate the conditions of fair use, so there shouldn't be any serious infringement.

[ksg91]

Problem has to be with headers you set in cURL, at least I think so.