java.lang.NoClassDefFoundError : Could not initialize class javax. mail.internet.InternetAddress

Question

我正在尝试使用 JavaMail API 发送电子邮件。这是我在 servlet 上的代码:

package com.lsp.web;

import com.lsp.service.Mailer;
import javax.ejb.EJB;
import javax.mail.MessagingException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "contact", urlPatterns = {"/contact"})
public class ContactServlet extends SpringInjectedServlet {
@EJB
private Mailer emailBean;

@Override
public void init() throws ServletException {

}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String customerEmail = req.getParameter("email");
    String subject = req.getParameter("subject");
    String body = req.getParameter("message");

    String error = null;
    String succMess = null;

    try {
        javax.mail.internet.InternetAddress ia = new javax.mail.internet.InternetAddress(customerEmail);
        ia.validate();
        emailBean.send(customerEmail, subject, body);
        req.setAttribute("succMessage", succMess);
        req.getRequestDispatcher("sent.jsp").forward(req, resp);

    } catch (javax.mail.internet.AddressException ae) {
        error = "您指出的邮箱地址不存在";
        req.setAttribute("errorMessage", error);
        req.getRequestDispatcher("contact.jsp").forward(req, resp);
    }
    catch (MessagingException mex) {
        error = "发送失败";
        req.setAttribute("errorMessage", error);
        req.getRequestDispatcher("contact.jsp").forward(req, resp);
    }
}
}

在我检查用户地址的行:

javax.mail.internet.InternetAddress ia = new javax.mail.internet.InternetAddress(customerEmail);
ia.validate();

我遇到了一个异常(exception)。java.lang.NoClassDefFoundError:无法初始化类 javax.mail.internet.InternetAddress

在 pom.xml 中，我添加了这些行:

<!--JavaMail API-->
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>javax.mail-api</artifactId>
        <version>1.5.1</version>
    </dependency>

    <!--EJB-->
    <dependency>
        <groupId>javax.ejb</groupId>
        <artifactId>ejb-api</artifactId>
        <version>3.0</version>
    </dependency>

我正在使用 Tomcat。有人可以告诉我为什么会发生这种情况以及如何解决该问题。

谢谢。

Answer 1

请参阅:https://stackoverflow.com/a/28935760/1128668您已将 mail-api.jar 包含在您的项目中。这只是 API 规范。修复方法是替换此:

<!-- DO NOT USE - it's just the API, not an implementation -->
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>

该 API 的引用实现:

<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>

我知道它的包名称中有 sun，但那是最新版本。