mvn clean package

java -jar <jar-file-name> <https://address.server.edu> [timeout]

[INFO]  Received host address https://www.google.com
[INFO]  Setting connection timeout to 5 second(s).
[INFO]  Trying to connect to https://www.google.com
[INFO]  Great! It worked.

[INFO]  Received host address https://registry.npmjs.org/sailthru-client
[INFO]  Setting connection timeout to 5 second(s).
[INFO]  Trying to connect to https://registry.npmjs.org/sailthru-client
[INFO]  Could not connect to the host address https://registry.npmjs.org/sailthru-client
[INFO]  The error is: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[INFO]  Here are the details:
[SEVERE]        sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Exception in thread "main" java.lang.RuntimeException: 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 Test.main(Test.java:61)
Caused by: 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 sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1868)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)
        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1338)
        at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:154)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:998)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1294)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1321)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1305)
        at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:515)
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
        at Test.main(Test.java:45)
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:385)
        at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
        at sun.security.validator.Validator.validate(Validator.java:260)
        at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
        at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
        at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1320)
        ... 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:196)
        at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
        ... 18 more