在实现javamail时无法初始化类sun.security.ssl.sslextension(在webapp中)

嗨，我是java新手，我在尝试javamail功能，它一直给我这个错误，java.lang.noclassdeffounderror:无法初始化类sun.security.ssl.sslextension，当我运行程序时。我在一个不同的项目上运行了它，它运行得很好，直到我将它集成到一个web应用程序中，错误才会弹出
下面是我的servlet，它给出了错误。

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author User
 */
public class SendMail extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet SendMail</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet SendMail at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);

    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);

    String to=request.getParameter("to");  
    String subject=request.getParameter("subject");  
    String msg=request.getParameter("msg");  

    send();  
    System.out.println("message has been sent successfully");  

    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

 public void send(){
     String to = "kezama1231@gmail.com";//change accordingly  
      String from = "kezama1231@gmail.com";  
      String host = "smtp.gmail.com";//or IP address  

     //Get the session object  
      Properties properties = System.getProperties();  
      properties.setProperty("mail.smtp.host", "smtp.gmail.com");
      properties.setProperty("mail.smtp.port", "587");
      properties.put("mail.smtp.auth", "true");
      properties.put("mail.smtp.starttls.enable", "true");
      Session session = Session.getInstance(properties,new javax.mail.Authenticator() {  
      protected PasswordAuthentication getPasswordAuthentication() {  
    return new PasswordAuthentication(from,"123");  
      }  
    });  

     //compose the message  
      try{  
         MimeMessage message = new MimeMessage(session);  
         message.setFrom(new InternetAddress(from));  
         message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));  
         message.setSubject("Ping");  
         message.setText("Hello, this is example of sending email  ");  

         // Send message  
         Transport.send(message);  
         System.out.println("message sent successfully....");  

      }catch (MessagingException mex) {mex.printStackTrace();}
}
}

下面是我使用的javafile

import java.util.*;  
import javax.mail.*;  
import javax.mail.internet.*;  
import javax.activation.*;

public class Mailer {  

public static void main(String[] args){
    String to = "kezama1231@gmail.com";//change accordingly  
      String from = "kezama1231@gmail.com";  
      String host = "localhost";//or IP address  

     //Get the session object  
      Properties properties = System.getProperties();  
      properties.setProperty("mail.smtp.host", "smtp.gmail.com");
      properties.setProperty("mail.smtp.port", "587");
      properties.put("mail.smtp.auth", "true");
      properties.put("mail.smtp.starttls.enable", "true");
      Session session = Session.getInstance(properties,new javax.mail.Authenticator() {  
      protected PasswordAuthentication getPasswordAuthentication() {  
    return new PasswordAuthentication(from,"123");  
      }  
    });  

     //compose the message  
      try{  
         MimeMessage message = new MimeMessage(session);  
         message.setFrom(new InternetAddress(from));  
         message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));  
         message.setSubject("Ping");  
         message.setText("Hello, this is example of sending email  ");  

         // Send message  
         Transport.send(message);  
         System.out.println("message sent successfully....");  

      }catch (MessagingException mex) {mex.printStackTrace();}
}

}

错误消息

java.lang.NoClassDefFoundError: Could not initialize class sun.security.ssl.SSLExtension
    at sun.security.ssl.SSLConfiguration.getEnabledExtensions(SSLConfiguration.java:380)
    at sun.security.ssl.ClientHello$ClientHelloKickstartProducer.produce(ClientHello.java:562)
    at sun.security.ssl.SSLHandshake.kickstart(SSLHandshake.java:509)
    at sun.security.ssl.ClientHandshakeContext.kickstart(ClientHandshakeContext.java:110)
    at sun.security.ssl.TransportContext.kickstart(TransportContext.java:233)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:394)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:602)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:376)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:193)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2151)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:716)
    at javax.mail.Service.connect(Service.java:364)
    at javax.mail.Service.connect(Service.java:222)
    at javax.mail.Service.connect(Service.java:171)
    at javax.mail.Transport.send0(Transport.java:230)
    at javax.mail.Transport.send(Transport.java:100)
    at SendMail.send(SendMail.java:127)
    at SendMail.doPost(SendMail.java:87)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:665)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1540)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:119)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:611)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:550)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:75)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:114)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:199)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:439)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:144)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:182)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:156)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:218)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:95)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:260)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:177)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:109)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:88)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:53)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:515)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:89)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:94)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:33)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:114)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549)
    at java.lang.Thread.run(Thread.java:748)

当我尝试将java文件与servlet链接时，也会出现同样的错误。

在实现javamail时无法初始化类sun.security.ssl.sslextension(在webapp中)

暂无答案！

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