How to use HTTPS to retrieve a set of files from a distant server?

Hi !
i am interested in some samples or links showing how is it possible to use HTTPS in a java code in a standalone application ( could be swing based or whatever) that allows an HTTPS connection to a distant server ( specefic file repository) so that downloading some data files could be possible.i am also interested to know what conditions should be available to make such connection possible ( specefic port number? specefic authentication? login? password? and does the Operating system on the distant server interfere with that ? etc...)
thanks!

in fact i tried to test a sample code by i got this exception :
Exception in thread "main" 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:174)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1591)
     at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:187)
     at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:181)
     at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:975)
     at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:123)
     at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:516)
     at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:454)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:884)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1096)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1123)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1107)
     at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:405)
     at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:166)
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:977)
     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:234)
     at HTTPSConnector.main(HTTPSConnector.java:30)
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:285)
     at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:191)
     at sun.security.validator.Validator.validate(Validator.java:218)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:249)
     at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:954)
     ... 12 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:174)
     at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238)
     at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:280)
     ... 18 moreand here si the sample code:
package foo;
import java.net.URL;
import java.io.*;
import javax.net.ssl.HttpsURLConnection;
public class Test
public static void main(String[] args)
throws Exception
String httpsURL = "https://your.https.url.here/";
URL myurl = new URL(httpsURL);
HttpsURLConnection con = (HttpsURLConnection)myurl.openConnection();
InputStream ins = con.getInputStream();
InputStreamReader isr=new InputStreamReader(ins);
BufferedReader in =new BufferedReader(isr);
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}so what this error is due to? and how to fix it ?.
thanks!

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