java.lang.LinkageError: loader constraint violation:previously initiated loading for a different type with name "javax/mail/Session"

Question

当我尝试使用 javax.mail-api 发送电子邮件时出现以下错误：

Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) previously initiated loading for a different type with name "javax/mail/Session"
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2279)
        at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1501)
        at org.apache.felix.framework.BundleWiringImpl.access0(BundleWiringImpl.java:75)
        at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1955)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at com.sun.mail.util.PropUtil.getBooleanSessionProperty(PropUtil.java:86)
        at javax.mail.internet.MimeMessage.initStrict(MimeMessage.java:320)
        at javax.mail.internet.MimeMessage.<init>(MimeMessage.java:195)
        at sendEmail(manage.java:216)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:408)
        at org.apache.camel.component.bean.MethodInfo.doProceed(MethodInfo.java:279)
        at org.apache.camel.component.bean.MethodInfo.proceed(MethodInfo.java:252)

代码：

Public void sendEmail() {
    String to = "abc@abc.com";
    String from = "efg@efg.com";
    final String username = "abc@abc.com";
    final String password = "password";
    Properties properties = new Properties();
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.host", "smtp.office365.com");
    properties.put("mail.smtp.port", "587");
    Session session = Session.getInstance(properties, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
    });
    try {
        System.out.println("Inside test");
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
        message.setSubject("Testing Subject");
        message.setText("This is message body");
        Transport.send(message);
        System.out.println("Sent message successfully....");
     } catch (MessagingException e) {
         throw new RuntimeException(e);
     }
}

我的 Maven 依赖项：

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>javax.mail-api</artifactId>
    <version>1.5.5</version>
</dependency>

请帮忙。

Answer 1

按照评论中的建议，将您的依赖项添加到 javamail 作为 provided 依赖项：

<dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.5.1</version>
        <scope>provided</scope>
</dependency>

这将跳过添加重复的 jar，然后由不同的类加载器加载。

如果不是因为某种原因被迫使用旧版本的 javamail，您应该更新到当前的最新版本

<dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.5.5</version>
        <scope>provided</scope>
</dependency>

Answer 2

我有一个非常相似的问题（与 org.keycloak.keycloak-saml-adapter-api-public），并通过编辑我的 standalone.xml 和删除这一行解决了这个问题：

<profile>
    <subsystem xmlns="urn:jboss:domain:ee:4.0">
        <global-modules>
            <module name="name.of.offending.package"/><!--REMOVE THIS LINE-->
        </global-modules>
    ...

此更改后您必须重新启动服务器。祝你好运。

java.lang.LinkageError: loader constraint violation:previously initiated loading for a different type with name "javax/mail/Session"

java.lang.LinkageError: loader constraint violation:previously initiated loading for a different type with name "javax/mail/Session"

java

email

jakarta-mail

maven