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Connect failed
javax.mail.MessagingException: Connect failed;
  nested 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.mail.pop3.POP3Store.protocolConnect(POP3Store.java:210)
	at javax.mail.Service.connect(Service.java:295)
	at javax.mail.Service.connect(Service.java:176)
	at com.bms.mailchecker.MailReciver.fetchNewMessages(MailReciver.java:765)
	at com.bms.mailchecker.MailEngine.fetchNewMessages(MailEngine.java:106)
	at com.bms.mailchecker.mailchecker.main(mailchecker.java:147)
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 com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
	at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
	at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
	at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:507)
	at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
	at com.sun.mail.pop3.Protocol.<init>(Protocol.java:107)
	at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:261)
	at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:206)
	... 5 more
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(Unknown Source)
	at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
	at sun.security.validator.Validator.validate(Unknown Source)
	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
	at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
	... 18 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
	at java.security.cert.CertPathBuilder.build(Unknown Source)
	... 24 more
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