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私は奇妙な問題を抱えています。リフトフレームワークを使用したJavaxメール
私はwebappをサーバー（jetty 7.4.3.v20110701）に配備しています。メーラを含むすべてのものが正常に動作しているようです。電子メールを送信するための情報を（-Djavax.activation.debug=trueとなった）デバッグすると、次のようになります。
MailcapCommandMap: createDataContentHandler for text/html
search DB #0
got content-handler
class com.sun.mail.handlers.text_html
INFO [qtp1699297250-32] net.liftweb.util.TimeHelpers.info[195] - Service request (GET) /reservation/276 returned 200, took 264 Milliseconds
INFO [qtp1699297250-34] net.liftweb.util.TimeHelpers.info[195] - Service request (GET) /ajax_request/liftAjax.js returned 200, took 9 Milliseconds
MailcapCommandMap: createDataContentHandler for multipart/alternative
search DB #0
got content-handler
class com.sun.mail.handlers.multipart_mixed
しかし、突然、どこからともなくコードだけで、作業を停止する：
Can't load DCH com.sun.mail.handlers.multipart_mixed; Exception:
java.lang.ClassNotFoundException: com/sun/mail/handlers/multipart_mixed
search DB #1
search DB #2
search DB #3
search fallback DB #0
search fallback DB #1
got content-handler
class com.sun.mail.handlers.multipart_mixed
Can't load DCH com.sun.mail.handlers.multipart_mixed; Exception: java.lang.ClassNotFoundException: com/sun/mail/handlers/multipart_mixed
search fallback DB #2
got content-handler
class com.sun.mail.handlers.multipart_mixed
Can't load DCH com.sun.mail.handlers.multipart_mixed; Exception: java.lang.ClassNotFoundException: com/sun/mail/handlers/multipart_mixed
search fallback DB #3
ERROR [pool-3-thread-13] net.liftweb.util.MailerImpl.error[239] - Couldn't send mail
javax.mail.MessagingException: IOException while sending message
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1141) ~[mail-1.4.4.jar:1.4.4]
at javax.mail.Transport.send0(Transport.java:189) ~[mail-1.4.1.jar:1.4.1]
at javax.mail.Transport.send(Transport.java:118) ~[mail-1.4.1.jar:1.4.1]
at net.liftweb.util.MailerImpl$$anon$1$$anonfun$$init$$1.apply(Mailer.scala:180) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$$anon$1$$anonfun$$init$$1.apply(Mailer.scala:180) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$class.performTransportSend(Mailer.scala:174) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.Mailer$.performTransportSend(Mailer.scala:31) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$class.msgSendImpl(Mailer.scala:276) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.Mailer$.msgSendImpl(Mailer.scala:31) ~[lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$MsgSender$$anonfun$messageHandler$1.apply(Mailer.scala:158) [lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$MsgSender$$anonfun$messageHandler$1.apply(Mailer.scala:155) [lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$class.execTranslate(LiftActor.scala:321) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$MsgSender.execTranslate(Mailer.scala:154) [lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$class.net$liftweb$actor$SpecializedLiftActor$$proc2(LiftActor.scala:289) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$$anonfun$net$liftweb$actor$SpecializedLiftActor$$processMailbox$1.apply(LiftActor.scala:210) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$$anonfun$net$liftweb$actor$SpecializedLiftActor$$processMailbox$1.apply(LiftActor.scala:210) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$class.around(LiftActor.scala:224) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.util.MailerImpl$MsgSender.around(Mailer.scala:154) [lift-util_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$class.net$liftweb$actor$SpecializedLiftActor$$processMailbox(LiftActor.scala:209) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.SpecializedLiftActor$$anonfun$2$$anonfun$apply$mcV$sp$1.apply$mcV$sp(LiftActor.scala:173) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at net.liftweb.actor.LAScheduler$$anonfun$9$$anon$2$$anon$3.run(LiftActor.scala:64) [lift-actor_2.9.0-1-2.4-M1.jar:2.4-M1]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_24]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_24]
at java.lang.Thread.run(Thread.java:662) [na:1.6.0_24]
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/alternative;
boundary="----=_Part_8_877795714.1310372068000"
at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:877) ~[na:1.6.0_24]
at javax.activation.DataHandler.writeTo(DataHandler.java:302) ~[na:1.6.0_24]
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403) ~[mail-1.4.1.jar:1.4.1]
at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1745) ~[mail-1.4.1.jar:1.4.1]
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1099) ~[mail-1.4.4.jar:1.4.4]
... 23 common frames omitted
をいくつかの時間後には、再び作業を開始することができます。
解決策を試しましたが、hereとhereをお勧めします。私はまたjavax.mail 1.4.1と1.4.4の両方を使ってjavax.activationを除いて試しました。いずれのソリューションも機能しませんでした。何が原因だろうか？どんな助けもありがたい。