title: How to solve an error: unable to find valid certification path to requested target error in Java?
body: <p>I have a problem with java mail. I configured my code like this:</p>
  
  <pre><code>    JavaMailSenderImpl mailSenderImpl = new JavaMailSenderImpl();
      mailSenderImpl.setHost(env.getProperty("smtp.host"));
      mailSenderImpl.setPort(env.getProperty("smtp.port", Integer.class));
      mailSenderImpl.setProtocol(env.getProperty("smtp.protocol"));
      mailSenderImpl.setUsername(env.getProperty("smtp.username"));
      mailSenderImpl.setPassword(env.getProperty("smtp.password"));
  
      Properties javaMailProps = new Properties();
      javaMailProps.put("mail.smtp.auth", true);
      javaMailProps.put("mail.smtp.starttls.enable", true);
  </code></pre>
  
  <p>And this are the properties:</p>
  
  <pre><code>    smtp.host= email.server.com
  
      smtp.port=587
  
      smtp.protocol=smtp
  
      smtp.username=email@server.com
  
      smtp.password=mypassword
  </code></pre>
  
  <p>Then I run the code. I got this exception:</p>
  
  <pre><code>    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
      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 exception details (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 com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1918)
      at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:652)
      at javax.mail.Service.connect(Service.java:295)
      at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:397)
      at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:308)
      at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:297)
      at com.sivalabs.springapp.UserServiceTest.testMail(UserServiceTest.java:111)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
      at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
      at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
      at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
      at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
      at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
      at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
      at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
      at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
      at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
      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)
      at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1884)
      at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)
      at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)
      at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1341)
      at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)
      at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
      at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)
      at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1016)
      at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)
      at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)
      at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)
      at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:548)
      at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:485)
      at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1913)
      ... 37 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(PKIXValidator.java:385)
      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:326)
      at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
      at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
      at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)
      ... 47 more
      Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
      at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
      at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
      at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
      ... 53 more
  </code></pre>
  
  <p>I read titles like this, I understand that java needs ca certificate then I install it by keytool.... for my environmental %JAVA_HOME% path and also for my jdk.1.7.0 path but I'm still getting the same error. So where do i still make a mistake?
  Thank you in advance for your help.</p>