not able to open url connection in java and getting certification error

[dhaval thakor]

This is my code .

In which i am doing connection with payment gateway and check payment of particular order is completed or not.?
This url will return string .
but i am getting below exception..

Please tell me what to do..?

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

/**
 *
 * A complete Java class that shows how to open a URL, then read data (text) from that URL,
 * HttpURLConnection class (in combination with an InputStreamReader and BufferedReader).
 *
 * @author alvin alexander, devdaily.com.
 *
 */
public class JavaHttpUrlConnectionReader
{
  public static void main(String[] args)
  throws Exception
  {
    new JavaHttpUrlConnectionReader();
  }
  
  public JavaHttpUrlConnectionReader()
  {
    try
    {
      String myUrl = "https://www.ccavenue.com/servlet/new_txn.OrderStatusTracker?Merchant_Id=ans2xxxx&Order_Id=sfsdfskldfj";
      // if your url can contain weird characters you will want to 
      // encode it here, something like this:
      // myUrl = URLEncoder.encode(myUrl, "UTF-8");

      String results = doHttpUrlConnectionAction(myUrl);
      System.out.println(results);
    }
    catch (Exception e)
    {
      // deal with the exception in your "controller"
    }
  }

  /**
   * Returns the output from the given URL.
   * 
   * I tried to hide some of the ugliness of the exception-handling
   * in this method, and just return a high level Exception from here.
   * Modify this behavior as desired.
   * 
   * @param desiredUrl
   * @return
   * @throws Exception
   */
  private String doHttpUrlConnectionAction(String desiredUrl)
  throws Exception
  {
    URL url = null;
    BufferedReader reader = null;
    StringBuilder stringBuilder;

    try
    {
      // create the HttpURLConnection
      url = new URL(desiredUrl);
      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
      
      // just want to do an HTTP GET here
      connection.setRequestMethod("GET");
      
      // uncomment this if you want to write output to this url
      //connection.setDoOutput(true);
      
      // give it 15 seconds to respond
      connection.setReadTimeout(10*1000);
      connection.connect();

      // read the output from the server
      reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
      stringBuilder = new StringBuilder();

      String line = null;
      while ((line = reader.readLine()) != null)
      {
        stringBuilder.append(line + "\n");
      }
      return stringBuilder.toString();
    }
    catch (Exception e)
    {
      e.printStackTrace();
      throw e;
    }
    finally
    {
      // close the reader; this can throw an exception too, so
      // wrap it in another try/catch block.
      if (reader != null)
      {
        try
        {
          reader.close();
        }
        catch (IOException ioe)
        {
          ioe.printStackTrace();
        }
      }
    }
  }
}

Exception is :

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:150)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1518)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:174)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:168)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:848)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:106)
	at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:495)
	at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:433)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:818)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1030)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1057)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1041)
	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:402)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:170)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:133)
	at JavaHttpUrlConnectionReader.doHttpUrlConnectionAction(JavaHttpUrlConnectionReader.java:74)
	at JavaHttpUrlConnectionReader.<init>(JavaHttpUrlConnectionReader.java:33)
	at JavaHttpUrlConnectionReader.main(JavaHttpUrlConnectionReader.java:21)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:221)
	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:145)
	at sun.security.validator.Validator.validate(Validator.java:203)
	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:172)
	at com.sun.net.ssl.internal.ssl.JsseX509TrustManager.checkServerTrusted(SSLContextImpl.java:320)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:841)
	... 13 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:236)
	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:194)
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:216)
	... 18 more