在Spring Web MVC中发送电子邮件时出现问题

Question

我在spring web mvc中发送电子邮件时遇到问题，这是登录控制台。我正在使用WildFly服务器，并且当用户在数据库中添加新表单时需要发送电子邮件，并且当我单击“提交”按钮时，我在控制台输出中检索到该日志文件时，有人可以帮助我吗？

StandardWrapperValve[dispatcher]: Servlet.service() for servlet dispatcher threw exception
java.lang.NullPointerException
    at controller.AddController.enviarCorreo(AddController.java:127)
    at controller.AddController.form(AddController.java:113)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.glassfish.tyrus.servlet.TyrusServletFilter.doFilter(TyrusServletFilter.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)

这是我的代码

package ejb;

import java.util.Properties;
import javax.ejb.Stateless;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

@Stateless
public class MailSenderBean {

public void sendEmail(String fromEmail, String username, String password, String toEmail, String subject, String message) throws AddressException, MessagingException{

    Properties props = System.getProperties();

    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.fsslback", "false");

    Session mailSession = Session.getDefaultInstance(props, null);

    mailSession.setDebug(true);

    Message mailMessage = new MimeMessage(mailSession);

    mailMessage.setFrom(new InternetAddress(fromEmail));

    mailMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(toEmail));
    mailMessage.setText(message);

    mailMessage.setSubject(subject);

    Transport transport = mailSession.getTransport("smtp");

    transport.connect("smtp.gmail.com", fromEmail, password);

    transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
}
}

这是发送电子邮件的好方法吗？还是存在更好的东西？我正在将Netbeans与Spring Web MVC一起使用。