java.io.FileNotFoundException: <my path> (The system cannot find the file specified). Please guide -

following code throws exception:

java.io.filenotfoundexception: c:\cloud project\resource freeing attacks in cloud performance code , db\ftp\ftp\src\public.key (the system cannot find file specified)     

i not able figure out why key file not found. doubt key files not getting written why system not find them.

package com.util;  import java.net.*; import java.io.*; import java.security.keyfactory; import java.security.keypair; import java.security.keypairgenerator; import java.security.nosuchalgorithmexception; import java.security.privatekey; import java.security.publickey; import java.security.spec.invalidkeyspecexception; import java.security.spec.pkcs8encodedkeyspec; import java.security.spec.x509encodedkeyspec; import javax.crypto.cipher; import javax.crypto.cipherinputstream; import javax.crypto.cipheroutputstream; import javax.crypto.spec.secretkeyspec;  public class simpleftpclient { public static string path = "c:/cloud project/resource freeing attacks in cloud performance code , db/ftp/ftp/src/";  private urlconnection m_client; private string host; private string user; private string password; private string remotefile; private string ermesg; private string succmesg;  public simpleftpclient() { } public void sethost(string host) {     this.host = host; } public void setuser(string user) {     this.user = user; } public void setpassword(string p) {     this.password = p; }  public void setremotefile(string d) {     this.remotefile = d; } public synchronized string getlastsuccessmessage() {     if (succmesg == null) {         return "";     }     return succmesg; } public synchronized string getlasterrormessage() {     if (ermesg == null) {         return "";     }     return ermesg; } public synchronized boolean uploadfile(inputstream is) { try {          bufferedinputstream bis = new bufferedinputstream(is);         outputstream os = m_client.getoutputstream();         bufferedoutputstream bos = new bufferedoutputstream(os);         string algo = "rsa/ecb/pkcs5padding";         simpleftpclient sftpcx = new simpleftpclient();         keypair kpr = sftpcx.loadkeypair(path, algo);         publickey pubkey = kpr.getpublic();         cipher encrypt =  cipher.getinstance(algo);           encrypt.init(cipher.encrypt_mode, pubkey);           cipheroutputstream cout=new cipheroutputstream(bos, encrypt);          byte[] buffer = new byte[1024];         int readcount;          while ((readcount = bis.read(buffer)) != -1) {             cout.write(buffer, 0, readcount);//cout instead of bos         }         cout.close();         bis.close();         bos.flush();         bos.close();          this.succmesg = "uploaded!";          return true;     } catch (exception ex) {         ex.printstacktrace();         stringwriter sw0 = new stringwriter();         printwriter p0 = new printwriter(sw0, true);         ex.printstacktrace(p0);         ermesg = sw0.getbuffer().tostring();          return false;     } } public synchronized boolean downloadfile(string localfilename) {     try {         inputstream = m_client.getinputstream();         bufferedinputstream bis = new bufferedinputstream(is);         system.out.println(">>>>>>>>>>>"+localfilename);         outputstream os = new fileoutputstream(localfilename);         bufferedoutputstream bos = new bufferedoutputstream(os);         string algo = "rsa/ecb/pkcs5padding";         simpleftpclient sftpc = new simpleftpclient();         keypair kpr = sftpc.loadkeypair(path, algo);         privatekey prvkey = kpr.getprivate();         cipher decrypt =  cipher.getinstance(algo);           decrypt.init(cipher.decrypt_mode, prvkey);           cipherinputstream cin=new cipherinputstream(bis, decrypt);         byte[] buffer = new byte[1024];         int readcount;         while ((readcount = cin.read(buffer)) != -1) {             bos.write(buffer, 0, readcount);         }         cin.close();         bis.close();         bos.flush();         bos.close();         this.succmesg = "downloaded!";          return true;     } catch (exception ex) {         ex.printstacktrace();         stringwriter sw0 = new stringwriter();         printwriter p0 = new printwriter(sw0, true);         ex.printstacktrace(p0);         ermesg = sw0.getbuffer().tostring();          return false;     } }  public synchronized boolean connect() {     try {         url url = new url("ftp://" + user + ":" + password + "@" + host + "/" + remotefile + ";type=i");         m_client = url.openconnection();         system.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.."+"ftp://" + user + ":" + password + "@" + host + "/" + remotefile + ";type=i");         return true;      } catch (exception ex) {         ex.printstacktrace();         stringwriter sw0 = new stringwriter();         printwriter p0 = new printwriter(sw0, true);         ex.printstacktrace(p0);         ermesg = sw0.getbuffer().tostring();         return false;     } }  public static void main(string arg[]) throws nosuchalgorithmexception, ioexception, invalidkeyspecexception {     simpleftpclient f = new simpleftpclient();     f.sethost("ftp.drivehq.com");     f.setuser("sabari06");     f.setpassword("sabari06");     f.setremotefile("c.txt");     boolean connected = f.connect();     try{         keypairgenerator keygen = keypairgenerator.getinstance("rsa");     keygen.initialize(1024);         keypair generatedkeypair = keygen.genkeypair();     system.out.println("generated key pair");         f.dumpkeypair(generatedkeypair);     f.savekeypair(path, generatedkeypair);     keypair loadedkeypair = f.loadkeypair(path, "rsa");         system.out.println("loaded key pair");     f.dumpkeypair(loadedkeypair);     }catch (exception e) { e.printstacktrace(); return; } } private void dumpkeypair(keypair keypair) {     publickey pub = keypair.getpublic();     system.out.println("public key: " + gethexstring(pub.getencoded()));     privatekey priv = keypair.getprivate();     system.out.println("private key: " + gethexstring(priv.getencoded())); }  private string gethexstring(byte[] b) {     string result = "";     (int = 0; < b.length; i++) {         result += integer.tostring((b[i] & 0xff) + 0x100, 16).substring(1);     }     return result; }  public void savekeypair(string path, keypair keypair) throws ioexception {     privatekey privatekey = keypair.getprivate();     publickey publickey = keypair.getpublic();      x509encodedkeyspec x509encodedkeyspec = new x509encodedkeyspec(             publickey.getencoded());     fileoutputstream fos = new fileoutputstream(path + "\\public.key");     fos.write(x509encodedkeyspec.getencoded());     fos.close();      pkcs8encodedkeyspec pkcs8encodedkeyspec = new pkcs8encodedkeyspec(             privatekey.getencoded());     fos = new fileoutputstream(path + "\\private.key");     fos.write(pkcs8encodedkeyspec.getencoded());     fos.close(); }   public keypair loadkeypair(string path, string algorithm)         throws ioexception, nosuchalgorithmexception,         invalidkeyspecexception {      file filepublickey = new file(path + "/public.key");     fileinputstream fis = new fileinputstream(path + "/public.key");     byte[] encodedpublickey = new byte[(int) filepublickey.length()];     fis.read(encodedpublickey);     fis.close();      file fileprivatekey = new file(path + "/private.key");     fis = new fileinputstream(path + "/private.key");     byte[] encodedprivatekey = new byte[(int) fileprivatekey.length()];     fis.read(encodedprivatekey);     fis.close();      keyfactory keyfactory = keyfactory.getinstance(algorithm);     x509encodedkeyspec publickeyspec = new x509encodedkeyspec(             encodedpublickey);     publickey publickey = keyfactory.generatepublic(publickeyspec);      pkcs8encodedkeyspec privatekeyspec = new pkcs8encodedkeyspec(             encodedprivatekey);     privatekey privatekey = keyfactory.generateprivate(privatekeyspec);      return new keypair(publickey, privatekey); } } 

open command prompt or ide administrator. don't have appropriate writing rights i've judged. right click on command prompt or ide , choose run administrator , try executing program again.