não encontra certificação digital ao enviar email

Programação Java
#1

Olá… estou tentando enviar um email pelo gmail… mas esbarro na exceção que diz que não encontra o certificado digital… bem… eu baixei ela do browser e instalei com o keytool e mesmo assim … se eu seto SSL pra true… ele diz que não tenho a chave. . caso não sete SSL para true … ele simplesmente da timeout e não acessa… alguem sabe o que pode estar ocorrendo?

Email email = new SimpleEmail();  

			email.setDebug(true);  
            
            email.setHostName("smtp.gmail.com");
            email.addTo(destinatario);
            email.setFrom("***@gmail.com");
            email.setSubject("assunto");
            email.setMsg("mensagem");
            email.setSSL(true);
//           
            email.setAuthentication("***@gmail.com", "*******");
            email.send();

Vi topicos relacionados mas nenhum resolveu o meu problema… alguem sabe o que pode estar havendo?? (estou tentando fazer isso de casa, não da empresa)

org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:465
	at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
	at org.apache.commons.mail.Email.send(Email.java:1437)
	at br.com.Procedimentos.utils.EmailUtils.enviarEmail(EmailUtils.java:26)
	at br.com.Procedimentos.teste.Teste.main(Teste.java:18)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;
  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.smtp.SMTPTransport.openServer(SMTPTransport.java:2055)
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:697)
	at javax.mail.Service.connect(Service.java:386)
	at javax.mail.Service.connect(Service.java:245)
	at javax.mail.Service.connect(Service.java:194)
	at javax.mail.Transport.send0(Transport.java:253)
	at javax.mail.Transport.send(Transport.java:124)
	at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
	... 3 more
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(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
	at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
	at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
	at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
	at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
	at sun.security.ssl.Handshaker.processLoop(Unknown Source)
	at sun.security.ssl.Handshaker.process_record(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
	at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
	at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:543)
	at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:348)
	at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:215)
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2019)
	... 10 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 sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
	... 22 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)
	... 28 more
#2

Já passei por este erro, no meu caso eu troquei o setSSl para setTLS e a porta para 587

email.setTLS(true);
email.setSmtpPort(587);

pra mim aqui está enviando normalmente assim.

#3