email sending UnsupportedOperationException

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exception stack is as follows

 java.lang.UnsupportedOperationException: Method not yet implemented
     at javax.mail.internet.MimeMultipart.<init>(MimeMultipart.java:37)
     at org.apache.commons.mail.MultiPartEmail.createMimeMultipart(MultiPartEmail.java:505)
     at org.apache.commons.mail.MultiPartEmail.init(MultiPartEmail.java:176)
     at org.apache.commons.mail.MultiPartEmail.getContainer(MultiPartEmail.java:482)
     at org.apache.commons.mail.HtmlEmail.build(HtmlEmail.java:523)
     at org.apache.commons.mail.HtmlEmail.buildMimeMessage(HtmlEmail.java:508)
     at org.apache.commons.mail.Email.send(Email.java:1162)

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find the problem

javax.mail.internet.MimeMultipart has been loaded but it's implementation may be out-of-date according to the exception stack mentioned above. so, search the target class javax.mail.internet.MimeMultipart by CTRL+SHIFT+T in Eclipse, we found two classes named the same name.

fix it

one is in resin-embed.jar and the other in geronimo-spec-javamail-1.3.1-rc3.jar. it is very likely that one of them is out-of-date. kick off one of them from classpath, see the result. if not ok, kick off the other one.

finally, geronimo-spec-javamail-1.3.1-rc3.jar is out-of-date.

by the way, javax.mail.internet.MimeMultipart is the mail specification in J2EE. Resin is a web container compliance with J2EE, it provides javax.mail implenmetation.

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a better way

to avoid depending on concrete web containers such as Resin or Tomcat, i decide to find an independent implementation and put it in $classpath. search javax.mail.internet.MimeMultipart in http://www.findjar.com and get mail-1.4.jar