Simple Spark client connection eclipse/javais throwing SSL exception

I tried to connect openfire from a simple java spark program but getting the following exception

Can you guys please help me?

AM Dhananjay


%% Invalidated: [Session-1, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA]

Smack Packet Reader (0), SEND TLSv1 ALERT: fatal, description = certificate_unknown

Smack Packet Reader (0), WRITE: TLSv1 Alert, length = 2

Smack Packet Reader (0), called closeSocket()

Smack Packet Reader (0), handling exception: 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

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:1884)

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:1341)

at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)

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:1016)

at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)

at org.jivesoftware.smack.tcp.XMPPTCPConnection.proceedTLSReceived(XMPPTCPConnecti on.java:655)

at org.jivesoftware.smack.tcp.PacketReader.parsePackets(PacketReader.java:221)

at org.jivesoftware.smack.tcp.PacketReader.access$000(PacketReader.java:47)

at org.jivesoftware.smack.tcp.PacketReader$1.run(PacketReader.java:81)

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:23 1)

at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.j ava:126)

at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)

… 11 more

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilde r.java:196)

at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)

at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)

… 17 more

org.jivesoftware.smack.SmackException$NotConnectedException

at org.jivesoftware.smack.tcp.XMPPTCPConnection.login(XMPPTCPConnection.java:233)

at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:442)

at smacktest.XMPPEx.main(XMPPEx.java:42)