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  1. ,
    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

  2. ,
    via Stack Overflow by carlos

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

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sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target	at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)	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:324)	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)	at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1283)	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1258)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)	at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:77)	at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)	at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:283)	at com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest.execute(GoogleAuthorizationCodeTokenRequest.java:158)	at com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest.execute(GoogleAuthorizationCodeTokenRequest.java:79)	at com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp.authorize(AuthorizationCodeInstalledApp.java:82)	at SheetsQuickstart.authorize(SheetsQuickstart.java:73)	at SheetsQuickstart.getSheetsService(SheetsQuickstart.java:86)	at SheetsQuickstart.main(SheetsQuickstart.java:103)