eclipse java.lang.ClassNotFoundException: javax.mail.MessagingException
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时间：2020-09-19 22:29:52 来源:igfitidea点击:
java.lang.ClassNotFoundException: javax.mail.MessagingException
提问by Aditya
I want to send a email from my gmail account to the another mail account using eclipse.I used apache tomcat 7.0.34 as my web server and use port 8080 for apache server(HTTP/1.1) and use JRE 7 as system library and also include mail.jar and activation.jar in Libraries under Java Resources.
我想使用 eclipse 将一封电子邮件从我的 gmail 帐户发送到另一个邮件帐户。我使用 apache tomcat 7.0.34 作为我的 Web 服务器并使用端口 8080 作为 apache 服务器（HTTP/1.1）并使用 JRE 7 作为系统库，并且在 Java 资源下的库中包含 mail.jar 和 activation.jar。
In the below my jsp page is given,where the recipient address is entered and submit to the server.
在下面给出了我的jsp页面，其中输入了收件人地址并提交给服务器。
SendMail.jsp
发送邮件.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="ControllerMail">
Recipient Address : <input type="email" name="to" ><br/><br/>
<input type="submit" value="Submit"/>
<input type="hidden" name="pageType" value="sendmail"/>
</form>
</body>
</html>
Now, My servlet class is given below.
现在，下面给出了我的 servlet 类。
ControllerMail.java
控制器邮件.java
package com.sendmail.controller;
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ControllerMail extends HttpServlet {
private static final long serialVersionUID = 1L;
public ControllerMail() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request,response);
}
protected void doProcess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
String pageType = request.getParameter("pageType");
if(pageType.equals("SendMail"))
{
String to = request.getParameter("to");
//Get the session object
Properties props = new Properties();
props.put("mail.smtp.host", "localhost");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("********@gmail.com","********");//change accordingly
}
});
//compose message
try {
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("********@gmail.com"));//change accordingly
message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
message.setSubject("Greetings");
message.setContent("Hi,what's up","text/html");
//send message
Transport.send(message);
System.out.println("message sent successfully");
} catch (MessagingException e) {throw new RuntimeException(e);}
}
}
}
But when I run my project on server that mean when I right click on my SendMail.jsp page and click on "run on server",the following errors are occured.
但是当我在服务器上运行我的项目时，这意味着当我右键单击我的 SendMail.jsp 页面并单击“在服务器上运行”时，会发生以下错误。
Mar 17, 2015 7:41:38 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre7/bin/client;C:/Program Files/Java/jre7/bin;C:/Program Files/Java/jre7/lib/i386;C:\Program Files\PC Connectivity Solution\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.7.0_75\bin;F:\Software\JavaMailAPI\activation-jaf1.1.1.jar;F:\Software\JavaMailAPI\java-mail-1.4.4.jar;F:\Software\eclipse-jee-luna-SR1a-win32\eclipse;;.
Mar 17, 2015 7:41:39 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:SendEmail' did not find a matching property.
Mar 17, 2015 7:41:39 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8081"]
Mar 17, 2015 7:41:39 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Mar 17, 2015 7:41:39 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 539 ms
Mar 17, 2015 7:41:39 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Mar 17, 2015 7:41:39 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.34
Mar 17, 2015 7:41:39 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SendEmail]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SendEmail]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 6 more
Caused by: java.lang.NoClassDefFoundError: javax/mail/MessagingException
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:87)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:261)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Caused by: java.lang.ClassNotFoundException: javax.mail.MessagingException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 20 more
Mar 17, 2015 7:41:39 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:451)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Mar 17, 2015 7:41:39 PM org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:451)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
Mar 17, 2015 7:41:39 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 249 ms
After 45 seconds,there will show a dialog box and it displays "Starting Tomcatv7.0 Server at localhost" encountered a problem.
45秒后，会出现一个对话框，显示“Starting Tomcatv7.0 Server at localhost”遇到问题。
回答by MrSimpleMind
java.lang.NoClassDefFoundError: javax/mail/MessagingException
java.lang.NoClassDefFoundError: javax/mail/MessagingException
Add the mail.jarfor example in your tomcat lib (/catalina_home/commons/libs/) or your web application file (see web-inf/lib).
例如，在您的 tomcat 库 (/catalina_home/commons/libs/) 或您的 Web 应用程序文件（请参阅 web-inf/lib）中添加mail.jar。
Also you might need the activation jar.
您也可能需要激活 jar。
For latest javax.mail.jar see https://java.net/projects/javamail/pages/Home
有关最新的 javax.mail.jar，请参阅https://java.net/projects/javamail/pages/Home
回答by Jens
You miss javax.mail-<version>.jarin your classpath. Download it and add it to your classpath. It is possible that you miss also the dependencies of this jar.
你错过javax.mail-<version>.jar了你的类路径。下载它并将其添加到您的类路径中。您也可能错过了这个 jar 的依赖项。
