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

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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:281)	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:136)	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1496)	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)	at sun.security.ssl.Handshaker$1.run(Handshaker.java:919)	at sun.security.ssl.Handshaker$1.run(Handshaker.java:916)	at java.security.AccessController.doPrivileged(Native Method)	at sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1369)	at org.apache.tomcat.websocket.AsyncChannelWrapperSecure$WebSocketSslHandshakeThread.run(AsyncChannelWrapperSecure.java:397)