無法從Google App Engine發送電子郵件

Question

我使用GAE版本1.7.3，並使用java郵件api發送電子郵件。 在本地開發服務器上，郵件發送正常。 但是在部署到App Engine之后，出現以下異常

com.google.apphosting.api.ApiProxy$CallNotFoundException: The API package 'remote_socket' or call 'Resolve()' was not found.
    at java.lang.Thread.getStackTrace(Thread.java:1495)
    at com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:240)
    at com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:66)
    at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:183)
    at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:180)

    at java.security.AccessController.doPrivileged(Native Method)

    at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:180)

    at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:66)

    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:107)
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:56)

    at com.google.appengine.api.socket.SocketApiHelper.apiProxyMakeSyncCall(SocketApiHelper.java:90)

    at com.google.appengine.api.socket.SocketApiHelper.makeSyncCall(SocketApiHelper.java:58)

    at com.google.appengine.api.socket.NameServiceImpl.lookupAllHostAddr(NameServiceImpl.java:61)

    at com.google.apphosting.util.ResolverManager$AppEngineNameservice.lookupAllHostAddr(ResolverManager.java:42)

    at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1353)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1303)

    at java.net.InetAddress.getAllByName(InetAddress.java:1232)

    at java.net.InetAddress.getAllByName(InetAddress.java:1163)

    at java.net.InetAddress.getByName(InetAddress.java:1113)

    at javax.mail.Service.connect(Service.java:257)

    at javax.mail.Service.connect(Service.java:91)

    at javax.mail.Service.connect(Service.java:76)

    at javax.mail.Transport.send(Transport.java:94)
    at javax.mail.Transport.send(Transport.java:48)
    at com.test.igreetings.service.impl.EmailImpl.sendEmail(EmailImpl.java:61)

這是我發送電子郵件的代碼：

try {
            // Email is my custom pojo class
            Email email = new Email();
            email.setMailHost("smtp.gmail.com");
            email.setAuth("true");
            email.setFrom("username@gmail.com");
            email.setTo("targetemail@example.com");
            email.setSubject("test);
            email.setMessage("test body");
            email.setPort("25");
            email.setStarttls("true");
            email.setLogin("username@gmail.com");
            email.setPassword("pwd");

            Properties props = new Properties();
            props.setProperty("mail.host", email.getMailHost());
            props.setProperty("mail.smtp.port", email.getPort());
            props.setProperty("mail.smtp.auth", email.getAuth());
            props.setProperty("mail.smtp.starttls.enable", email.getStarttls());

            Authenticator auth = new SMTPAuthenticator(email.getLogin(), email.getPassword());

            Session session = Session.getInstance(props, auth);

            MimeMessage msg = new MimeMessage(session);
            msg.setText(email.getMessage());
            msg.setSubject(email.getSubject());
            msg.setFrom(new InternetAddress(email.getFrom()));
            msg.addRecipient(Message.RecipientType.TO, new InternetAddress(email.getTo()));
            Transport transport = session.getTransport("smtp");
            transport.connect(email.getMailHost(), 25, "username@gmail.com", "pwd");

            transport.sendMessage(msg, msg.getAllRecipients());

            transport.close();
        } catch (AuthenticationFailedException ex) {
            Logging.log("AuthenticationFailedException in sendEmail: " + ex.toString());
            ex.printStackTrace();

        } catch (AddressException ex) {

            Logging.log("AddressException in sendEmail: " + ex.toString());
            ex.printStackTrace();
        } catch (MessagingException ex) {
            Logging.log("MessagingException in sendEmail: " + ex.toString());
            ex.printStackTrace();
        }

編輯：

我已根據您的建議更改了代碼，這是我的更新代碼：

Properties props = new Properties();
                        Session session = Session.getDefaultInstance(props, null);
                        Message msg = new MimeMessage(session);
                        msg.setFrom(new InternetAddress("username@gmail.com"));
                        msg.addRecipient(Message.RecipientType.TO,
                        new InternetAddress("targetemail@example.com"));
                        msg.setSubject("test");
                        msg.setText("test");
                        Transport.send(msg);

而且我也收到類似的異常，未找到API包“ remote_socket”或調用“ CreateSocket（）”。 上述發送者也已注冊為該應用程序的開發者。

Answer 1

正如@Shay指出的，您不能將外部SMTP提供程序與GAE一起使用。 GAE使用它自己的SMTP網關。

相關問題：在GAE上，您只能通過Google帳戶發送來自一位應用程序管理員（GAE管理員->權限）或當前登錄用戶的電子郵件（即來自字段）。 注意：這僅適用於通過Google帳戶登錄的用戶，不適用於通過聯合登錄（例如OpenID）登錄的用戶： 代表Google Apps用戶發送電子郵件 （答案來自Google工程師）

更新：如前所述， username@gmail.com必須是通過Google Apps登錄名登錄到GAE應用程序的用戶的電子郵件，或者該用戶必須是GAE應用程序的管理員。

Update2：這對我有用 ：

Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
try {
    Message msg = new MimeMessage(session);
    msg.setFrom(new InternetAddress("admin@domain.com", "Admin", "UTF-8"));
    msg.addRecipient(Message.RecipientType.TO, new InternetAddress(recipientAddress));
    msg.setSubject(emailSubject);
    msg.setText(emailText);
    Transport.send(msg);

} catch (AddressException e) {
// TO address not valid
} catch (MessagingException e) {
    // other email error
} catch (UnsupportedEncodingException e) {
    // should not happen UTF-8 is always available
}

Answer 2

應用程序無法使用JavaMail界面連接到其他郵件服務以發送或接收電子郵件。 添加到傳輸或會話的SMTP配置將被忽略。

刪除端口，用戶，密碼和郵件主機設置，它應該可以工作。