title: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection
body: <p>I am trying to send a mail from spring application. I have included all the jar files but it is showing this exception:</p>
  
  <pre><code>javax.mail.MessagingException: Exception reading response;
    nested exception is:
      javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
      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 org.symb.leavemanagement.mail.SampleMail.sentMail(SampleMail.java:65)
      at org.symb.leavemanagement.controller.AdminController.processRegistratingUser(AdminController.java:196)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:601)
      at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
      at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:421)
      at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:409)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
      at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
      at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
      at java.lang.Thread.run(Thread.java:722)
  Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
      at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:541)
      at sun.security.ssl.InputRecord.read(InputRecord.java:374)
      at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:893)
      at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1294)
      at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:848)
      at sun.security.ssl.AppInputStream.read(AppInputStream.java:102)
      at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
      at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:88)
      at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589)
      ... 38 more
  </code></pre>