Github user dltc commented on the issue:
https://github.com/apache/tomcat/pull/107
mysql-drive close the connection while IOException occur. if testOnReturn
is false the connection will have been returned to the pool and may have been
borrowed by another thread
GitHub user dltc opened a pull request:
https://github.com/apache/tomcat/pull/107
underlying connection closed unexpectedly, so we must destroy this proxy
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dltc/tomcat trunk