Executing cgi-bin from a java program

I am trying to develop a Java HTTP server that also includes support for CGI-BIN but the last weeks i am stack at the same point ! I am trying to execute the cgi and then give it an argument but i never have an output ! Please help cause the deadline is coming near !!!
//Set environment variables
String[] setVar = {"REQUEST_METHOD=POST","CONTENT_LENGTH="+extra.length};
String[] cgi = {"/bin/bash","./home/pap/jhttp"+Petition_Analysis.pt.uri.path,"/n"};
//Execute the cgi-bin with the appropriate input
Process cgiOut = Runtime.getRuntime().exec(cgi,setVar);
// get its output (your input) stream
DataOutputStream put = new DataOutputStream(cgiOut.getOutputStream());
put.writeBytes(Petition_Analysis.pt.Pet_Body);
DataInputStream in = new DataInputStream(cgiOut.getInputStream());
// Read and print the output
String line;
StringBuffer page = new StringBuffer();
while ((line = in.readLine()) != null) {
page.append(line);
//Send page to client
out.print("HTTP/1.1 200 OK\r\n");
out.print("Content-Length: " + page.toString().length() +"\r\n\r\n");
System.out.print(page);
Cgi call is like that:
./post_from.cgi
first_operand=342&second_operand=32&operation=-
Note that there is a blank line !

Well no, the script works perfectly, here is the output of the console in Linux system and this exactly what i want to do in the program:
[pap@laptop pap]$ export CONTENT_LENGTH=11
[pap@laptop pap]$ export REQUEST_METHOD=POST
[pap@laptop pap]$ /home/pap/jhttp/cgi-bin/post_form.cgi
op1=1&op2=2
Content-Type: text/html
<html><head><title>Script results</title></head>
<body>
Number of sent fields: 2

Field: op1 
Valor: 1


Field: op2 
Valor: 2

</body></html>
So the question is how to this inside a Java program and better forget my code which is erroneous
also forgive my english :)

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