Eclipse：java.lang.NoClassDefFoundError：javax / activation / DataHandler [英] Eclipse: java.lang.NoClassDefFoundError: javax/activation/DataHandler
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问题描述
我正在尝试用Java发送电子邮件。
这是代码：
I'm trying to send an email in java. Here's the code:
String mailSmtpHost = "smtp.example.com";
String mailTo = "email@example.com";
String mailFrom = "email@example.com";
String mailSubject = "Email subject";
String mailText = "Some text";
Properties properties = new Properties();
properties.put("mail.smtp.host", mailSmtpHost);
Session emailSession = Session.getDefaultInstance(properties);
try {
Message emailMessage = new MimeMessage(emailSession);
emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
emailMessage.setFrom(new InternetAddress(mailFrom));
emailMessage.setSubject(mailSubject);
emailMessage.setText(mailText);
emailSession.setDebug(true);
Transport.send(emailMessage);
}catch(Exception e) {
System.out.println("Errore email: "+e.toString());
}
编译项目时，在线：
Message emailMessage = new MimeMessage(emailSession);
...出现以下错误：
...the following error comes out:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/activation/DataHandler
注意：我正在使用 java -version：9.0.4
推荐答案
JDK 9默认禁用对许多javax。* API的访问，现已弃用javax激活。
JDK 9 disables access to many of the javax.* APIs by default, javax activation is now deprecated.
但是您可以解决它在运行时添加模块
However you can resolve it with adding the module at run time
"--add-modules java.activation".
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