The stack trace states that the class org.postgresql.Driver could not be found. This does not indicate a bug in logback, in particualr I do not see the relation with the title of this issue "DBAppender can't partipate in a container managed transaction".

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira