how to run sending-mime-email-with-thymeleaf-example project

[ltanme]

my project structure

I use intellij idea debug run MimeEmailWithThymeleafApplication.java did not work

├── pom.xml
├── sending-mime-email-with-thymeleaf-example.iml
├── src
│   └── main
│   ├── java
│   │   └── com
│   │   └── test
│   │   ├── MimeEmailWithThymeleafApplication.java
│   │   └── TestService.java
│   └── resources
│   ├── application.yml
│   ├── attachments
│   │   └── Questo\ documento\ xxx\ un\ test.pdf
│   ├── images
│   │   └── galaxy.jpeg
│   └── templates
│   └── subfolder
│   └── emailTemplate.html
└── target
├── classes
│   ├── application.yml
│   ├── attachments
│   │   └── Questo\ documento\ xxx\ un\ test.pdf
│   ├── com
│   │   └── test
│   │   ├── MimeEmailWithThymeleafApplication$1.class
│   │   ├── MimeEmailWithThymeleafApplication.class
│   │   └── TestService.class
│   ├── images
│   │   └── galaxy.jpeg
│   └── templates
│   └── subfolder
│   └── emailTemplate.html
├── generated-sources
│   └── annotations
├── maven-archiver
│   └── pom.properties
├── maven-status
│   └── maven-compiler-plugin
│   └── compile
│   └── default-compile
│   ├── createdFiles.lst
│   └── inputFiles.lst
└── sending-mime-email-with-thymeleaf-example-0.6.3.jar

error:
`
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-12-20 11:48:43.392 ERROR 96985 --- [ main] o.s.boot.SpringApplication : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mimeEmailWithThymeleafApplication': Invocation of init method failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
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. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
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; message exceptions (1) are:
Failed message 1: javax.mail.MessagingException: Could not convert socket to TLS;
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 org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:137) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at com.test.MimeEmailWithThymeleafApplication.main(MimeEmailWithThymeleafApplication.java:30) [classes/:na]
Caused by: org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
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. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
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 org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:432) ~[spring-context-support-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) ~[spring-context-support-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340) ~[spring-context-support-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at it.ozimov.springboot.mail.service.defaultimpl.DefaultEmailService.send(DefaultEmailService.java:125) ~[spring-boot-email-core-0.5.0.jar:0.5.0]
at com.test.TestService.sendMimeEmailWithThymeleaf(TestService.java:54) ~[classes/:na]
at com.test.MimeEmailWithThymeleafApplication.sendEmail(MimeEmailWithThymeleafApplication.java:40) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_20]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_20]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:311) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:134) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
... 18 common frames omitted
Caused by: javax.mail.MessagingException: Could not convert socket to TLS
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2064) ~[javax.mail-1.5.6.jar:1.5.6]
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:724) ~[javax.mail-1.5.6.jar:1.5.6]
at javax.mail.Service.connect(Service.java:366) ~[javax.mail-1.5.6.jar:1.5.6]
at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:501) ~[spring-context-support-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:421) ~[spring-context-support-4.3.10.RELEASE.jar:4.3.10.RELEASE]
... 30 common frames omitted
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(Alerts.java:192) ~[na:1.8.0_20]
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1917) ~[na:1.8.0_20]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:301) ~[na:1.8.0_20]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:295) ~[na:1.8.0_20]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1369) ~[na:1.8.0_20]
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:156) ~[na:1.8.0_20]
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:925) ~[na:1.8.0_20]
at sun.security.ssl.Handshaker.process_record(Handshaker.java:860) ~[na:1.8.0_20]
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1043) ~[na:1.8.0_20]
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1343) ~[na:1.8.0_20]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371) ~[na:1.8.0_20]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355) ~[na:1.8.0_20]
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:598) ~[javax.mail-1.5.6.jar:1.5.6]
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:525) ~[javax.mail-1.5.6.jar:1.5.6]
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2059) ~[javax.mail-1.5.6.jar:1.5.6]
... 34 common frames omitted
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(PKIXValidator.java:387) ~[na:1.8.0_20]
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292) ~[na:1.8.0_20]
at sun.security.validator.Validator.validate(Validator.java:260) ~[na:1.8.0_20]
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324) ~[na:1.8.0_20]
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229) ~[na:1.8.0_20]
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124) ~[na:1.8.0_20]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1351) ~[na:1.8.0_20]
... 44 common frames omitted
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:145) ~[na:1.8.0_20]
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:131) ~[na:1.8.0_20]
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280) ~[na:1.8.0_20]
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382) ~[na:1.8.0_20]
... 50 common frames omitted
`

[robertotru]

It looks like the configuration is wrong.
You probably put something wrong in the spring.mail.* parameters inside the application.properties file.

[ltanme]

@robertotru
#my yml conf :
spring.mail.host: smtp.xx.com
spring.mail.port: 587
spring.mail.username: notify-xx
spring.mail.password: xxx
#spring.mail.properties.mail.smtp.auth: true
#spring.mail.properties.mail.smtp.starttls.enable: true
#spring.mail.properties.mail.smtp.starttls.required: true
#spring.mail.smtp.starttls.enable: true

thank you!
configuration is wrong
now it's work!