He escrito el siguiente bean para autenticar mi correo.

public class Mail_Authenticator {

   public Session Get_Auth() {
        // sets SMTP server properties
        ResourceBundle rs_mail = ResourceBundle.getBundle("mail");
        final String userName=rs_mail.getString("username");
        final String password=rs_mail.getString("password");
        Properties properties = new Properties();
        properties.put("mail.smtp.host", "smtp.gmail.com");
        properties.put("mail.smtp.port", "587");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
        properties.put("mail.user", userName);   

        //creates a new session with an authenticator
        Authenticator auth = new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };
        return (Session.getInstance(properties, auth));

    }
}

El problema es con la configuración de smtp, cuando ejecuto la aplicación en mi servidor local, funciona bien. Pero cuando ejecuto la aplicación en el servidor openshift se produce una excepción en

Transport.send(msg);

¿Podría alguien indicar el problema en la configuración anterior y por qué están trabajando en mi máquina local?

La siguiente es la excepción que tengo

javax.mail.AuthenticationFailedException: 534-5.7.14 <https://accounts.google.com/ContinueSignIn?sarp=1&scc=1&plt=AKgnsbsWq 534-5.7.14 JJjb_c-FzrtUAccdDqOCMtsPAOL1AwIDSCoireBRoI5X-avznrYbparV84O_zkAvrHXMB9 534-5.7.14 T0Zj8zXP1g1woaWHnTzJQ3vWFn3lwTNl9Kn8Ma9-d9FPD_xB-bMBSh5FEPdaMqID4WljXW 534-5.7.14 v67IfQzXHolKlY48pEiZF-cpGc6CEgknkET1ciEQf51vQuETuMrrzeC7EDcM7s89Njtm5e 534-5.7.14 crMNRLw> Please log in via your web browser and then try again. 534-5.7.14 Learn more at https://support.google.com/mail/bin/answer.py?answer=787 534 5.7.14 54 e7sm180653184qag.7 - gsmtp

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:823)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:756)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:673)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at Servlet.Mail.sendEmail(Mail.java:72)
at Servlet.Mail.doGet(Mail.java:206)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)