Error when sending emails

[Migrated From Jforum.net]

Not sure, but my first WAG would be that you might have multiple copies / versions of the mail and activation jars. This can run up against some of the webapp server security rules.

Try removing them from the WEB-INF/lib directory and seeing if these removes the conflict.
[originally posted on jforum.net by monroe]

[Migrated From Jforum.net]

Hi,

I've got the following exception when JForum sends an email (when a moderated message is validated for example) :
09:38:22,187 ERROR [Spammer ] Error while dispatching the message.javax.mail.MessagingException: IOException while sending message;
nested exception is:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type text/plain; charset=us-ascii
javax.mail.MessagingException: IOException while sending message;
nested exception is:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type text/plain; charset=us-ascii
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:625)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:120)
at net.jforum.util.mail.Spammer.dispatchMessages(Spammer.java:192)
at net.jforum.util.mail.EmailSenderTask.run(EmailSenderTask.java:63)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:727)
at java.lang.Thread.run(Thread.java:595)
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type text/plain; charset=us-ascii
at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:851)
at javax.activation.DataHandler.writeTo(DataHandler.java:305)
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1350)
at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1683)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:585)
... 6 more

Here is my configuration in SystemGlobals.properties :

##################
# MAIL SETTINGS
##################
mail.lostPassword.messageFile = mail/lostPassword.txt
mail.lostPassword.subject = [${forum.name}] Password recovery

# If "true", a mail will be send to users when a topic is
# answered. To disable, set to "false"
mail.notify.answers = true

# SMTP config
mail.sender = [e-mail]
mail.smtp.auth =
mail.smtp.host = messagerie-cr

# Non-SSL default port is 25. If SSL, the default por is 465.
mail.smtp.port = 25

mail.smtp.username =
mail.smtp.password =

# the period in milliseconds JForum waits before sending next mail to SMTP server.
# Some SMTP server will response 421 if you sending a lot of mails in a very short time. 
# set it to 0 (zero) to disable it completely
mail.smtp.delay = 2000

# SSL support for SMTP. Set it to "true" if your
# host requires that (GMail does). Don't forget
# to change the mail.smtp.port too
mail.smtp.ssl = false

# If true, allow users to interact to the forum using any
# email client, by just sending a message to a specific address
mail.pop3.integration.enabled = false

# If "false", deletes all messages retrieved from a POP3
# connection. If "true", keep them in the server
mail.pop3.debug.keep.messages = true

# If the mail.smtp.host cannot be resolved, JavaMail sends a HELO 
# without an hostname - which is a violation of the SMTP protocol
# You can set this property to force the hostname
mail.smtp.localhost = 

# If "true", requires all new users to validate their email
# addresses in order to be accepted in the system
mail.user.email.auth = false

# Can be "text" or "html"
mail.messageFormat = text

mail.charset = UTF-8
mail.template.encoding = UTF-8

mail.newAnswer.messageFile = mail/mailNewReply.txt
mail.newAnswer.subject = [${forum.name}] Message posted: {0}

mail.newPm.subject = [${forum.name}] Private Message
mail.newPm.messageFile = mail/newPrivateMessage.txt

mail.newTopic.messageFile = mail/mailNewTopic.txt
mail.newTopic.subject = [${forum.name}] New Topic: {0}

mail.activationKey.subject = [${forum.name}] Activate forum account
mail.activationKey.messageFile = mail/activateAccount.txt

mail.summary.weekly.messageFile = mail/summaryMessage.txt
mail.summary.weekly.subject = [${forum.name}] Weekly Summary

and in jforum-custom.conf :

mail.activationKey.messageFile=mail/activateAccount.txt
mail.activationKey.subject=[My Forum] Activate forum account
mail.charset=UTF-8
mail.lostPassword.messageFile=mail/lostPassword.txt
mail.lostPassword.subject=[My Forum] Password recovery
mail.messageFormat=text
mail.newAnswer.messageFile=mail/mailNewReply.txt
mail.newAnswer.subject=[My Forum] Message posted\: {0}
mail.newPm.messageFile=mail/newPrivateMessage.txt
mail.newPm.subject=[My Forum] Private Message
mail.notify.answers=true
mail.sender=[e-mail]
mail.smtp.auth=false
mail.smtp.host=messagerie-cr
mail.smtp.password=
mail.smtp.port=25
mail.smtp.ssl=false
mail.smtp.username=[e-mail]
mail.user.email.auth=false

[originally posted on jforum.net by toomtooms]

[Migrated From Jforum.net]

I don't have multiple copies or versions of the activation and mail jars in WEB-INF/lib.
[originally posted on jforum.net by toomtooms]

[Migrated From Jforum.net]

But you might have copies in other directories in the class path... e.g. there might be one in the JVM you're using, or in the shared or common directories of your application engine.

For various security reasons, if a class is loaded at a "higher level", it can't dynamically create a class from a "lower level" jar (this would let application people inject code into the system level and do intentional or unintentional "bad things")

So, what may be happening is that a root class from the activation package is being created at a higher level first (maybe by another webapp or the system), then when internally it tries to dynamically load/create a class, the class is being found at a lower level. This is then denied by the security mechanism and generally gets reported as a "class not found" error.
[originally posted on jforum.net by monroe]

[Migrated From Jforum.net]

Thank you for your explanation !

So I tried to remove the 2 jars in WEB-INF/lib but I've got the same exception
[originally posted on jforum.net by toomtooms]