java.lang.NoClassDefFoundError: javax/mail/Authenticator答案

【问题标题】：java.lang.NoClassDefFoundError: javax/mail/Authenticatorjava.lang.NoClassDefFoundError: javax/mail/Authenticator
【发布时间】：2013-11-07 09:34:22
【问题描述】：

将war部署到tomcat服务器时遇到异常

java.lang.NoClassDefFoundError: javax/mail/Authenticator
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2398)
at java.lang.Class.getDeclaredConstructors(Class.java:1838)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:229)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:962)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:935)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:607)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518)

谁能帮我解决这个异常。

【问题讨论】：

javax/mail/Authenticator 不在类路径中 captainObvious docs.oracle.com/javase/tutorial/essential/environment/…
@hovanessyan stackoverflow.com/a/1631901/985949。 “ 在类路径中找不到类” => 不是“显而易见的”，但可能。不同于 ClassNotFoundException
您需要 JavaMail API - 看看 oracle.com/technetwork/java/javamail/index.html 。将 mail-x.y.z.jar 放入 Tomcats lib/ 文件夹中。
@GyroGearless 你认为他为什么使用 Tomcat？
@m0skit0 因为问题被标记为“Tomcat”？

标签： java tomcat jakarta-mail

【解决方案1】：

您必须在 pom.xml 中添加新的依赖项

 <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4.5</version>
    </dependency>

    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>

【讨论】：

假设他有一个 pom.xml。问题中没有提到。