java - Javamail Could not convert socket to TLS GMail -


i trying send email using javamail through gmails smtp server. code.

final string username = "mygmail@gmail.com";     final string password = "mygmailpassword";      properties props = new properties();     props.put("mail.smtp.auth", true);     props.put("mail.smtp.starttls.enable", true);     props.put("mail.smtp.host", "smtp.gmail.com");     props.put("mail.smtp.port", "587");      session session = session.getinstance(props,             new javax.mail.authenticator() {                 protected passwordauthentication getpasswordauthentication() {                     return new passwordauthentication(username, password);                 }             });      try {          message message = new mimemessage(session);         message.setfrom(new internetaddress("no-reply@gmail.com"));         message.setrecipients(message.recipienttype.to,                 internetaddress.parse("test@gmail.com"));         message.setsubject("testing subject");         message.settext("dear mail crawler,"                 + "\n\n no spam email, please!");          transport.send(message);          system.out.println("done");      } catch (messagingexception e) {         throw new runtimeexception(e);     }

returns error

could not convert socket tls;

the complete stacktrace

exception in thread "main" java.lang.runtimeexception: javax.mail.messagingexception: not convert socket tls;   nested exception is:     javax.net.ssl.sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ test.main(test.java:43) caused by: javax.mail.messagingexception: not convert socket tls;   nested exception is:     javax.net.ssl.sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ com.sun.mail.smtp.smtptransport.starttls(smtptransport.java:1907)     @ com.sun.mail.smtp.smtptransport.protocolconnect(smtptransport.java:666)     @ javax.mail.service.connect(service.java:317)     @ javax.mail.service.connect(service.java:176)     @ javax.mail.service.connect(service.java:125)     @ javax.mail.transport.send0(transport.java:194)     @ javax.mail.transport.send(transport.java:124)     @ test.main(test.java:38) caused by: javax.net.ssl.sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ com.sun.net.ssl.internal.ssl.alerts.getsslexception(alerts.java:174)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.fatal(sslsocketimpl.java:1649)     @ com.sun.net.ssl.internal.ssl.handshaker.fatalse(handshaker.java:241)     @ com.sun.net.ssl.internal.ssl.handshaker.fatalse(handshaker.java:235)     @ com.sun.net.ssl.internal.ssl.clienthandshaker.servercertificate(clienthandshaker.java:1206)     @ com.sun.net.ssl.internal.ssl.clienthandshaker.processmessage(clienthandshaker.java:136)     @ com.sun.net.ssl.internal.ssl.handshaker.processloop(handshaker.java:593)     @ com.sun.net.ssl.internal.ssl.handshaker.process_record(handshaker.java:529)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.readrecord(sslsocketimpl.java:893)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.performinitialhandshake(sslsocketimpl.java:1138)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.starthandshake(sslsocketimpl.java:1165)     @ com.sun.net.ssl.internal.ssl.sslsocketimpl.starthandshake(sslsocketimpl.java:1149)     @ com.sun.mail.util.socketfetcher.configuresslsocket(socketfetcher.java:549)     @ com.sun.mail.util.socketfetcher.starttls(socketfetcher.java:486)     @ com.sun.mail.smtp.smtptransport.starttls(smtptransport.java:1902)     ... 7 more caused by: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ sun.security.validator.pkixvalidator.dobuild(pkixvalidator.java:323)     @ sun.security.validator.pkixvalidator.enginevalidate(pkixvalidator.java:217)     @ sun.security.validator.validator.validate(validator.java:218)     @ com.sun.net.ssl.internal.ssl.x509trustmanagerimpl.validate(x509trustmanagerimpl.java:126)     @ com.sun.net.ssl.internal.ssl.x509trustmanagerimpl.checkservertrusted(x509trustmanagerimpl.java:209)     @ com.sun.net.ssl.internal.ssl.x509trustmanagerimpl.checkservertrusted(x509trustmanagerimpl.java:249)     @ com.sun.net.ssl.internal.ssl.clienthandshaker.servercertificate(clienthandshaker.java:1185)     ... 17 more caused by: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ sun.security.provider.certpath.suncertpathbuilder.enginebuild(suncertpathbuilder.java:174)     @ java.security.cert.certpathbuilder.build(certpathbuilder.java:238)     @ sun.security.validator.pkixvalidator.dobuild(pkixvalidator.java:318)     ... 23 more 

props.put("mail.smtp.ssl.trust", "smtp.gmail.com");

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