线程“主”中的异常java.lang.NoClassDefFoundError：javax / activation / DataHandler

Question

嗨，我已经编写了一个代码，可以在Linux中通过javax邮件发送邮件。它正在正确编译，但抛出异常

Exception in thread "main" java.lang.NoClassDefFoundError: javax/activation/DataHandler
    at Mail.JavaMail.preparemessage(JavaMail.java:56)
    at Mail.JavaMail.sendmail(JavaMail.java:46)
    at Mail.JavaMail.main(JavaMail.java:17)
enter code here