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  1. ,
    via Stack Overflow by carlos

    Set the mail.smtp.ssl.trust system property to an smtp host, like smtp.gmail.com.

  2. ,
    Expert tip

    If you're using wiremock, configure your code to accept wiremock self-signed certificate or create a keystore and certificate that are trusted by your HTTP client and configure wiremock to use that

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Exception reading response; 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
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Exception reading response; nested exception is: java.net.SocketException: Connection reset
javax.mail.MessagingException: Exception reading response;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.readServerResponse(SMTPTransport.java:1611) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1369) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412) at javax.mail.Service.connect(Service.java:310) at javax.mail.Service.connect(Service.java:169) at javax.mail.Service.connect(Service.java:118) at javax.mail.Transport.send0(Transport.java:188) at javax.mail.Transport.send(Transport.java:118) at com.demo.MySendMails.sendMail(MySendMails.java:477) at com.demo.MySendMails.BirthDayMail(MySendMails.java:291) at com.demo.MySendMails.main(MySendMails.java:535)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(Alerts.java:174) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1731) at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:241) at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:235) at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1206) at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136) at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593) at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:925) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1170) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:785) at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:75) at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110) at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read(BufferedInputStream.java:237) at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:88) at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589) ... 10 moreCaused 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:323) at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217) at sun.security.validator.Validator.validate(Validator.java:218) at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126) at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209) at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:249) at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1185) ... 22 moreCaused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174) at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238) at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318) ... 28 more