Heroku上のPlayから外のMysqlに接続すると、1度目は必ず失敗してしまう問題の解決方法

ありません。

先日scalaの勉強会で見てもらった限りでは、現状(2012/06/19現在)、根本的な解決策は「ない」とのことでした。
2回目はうまくいくので、リトライするようにしましょう。

heroku上の該当のエラーログの抜粋

herokuのエラーログ

2012-06-20T01:49:22+00:00 app[web.1]: [error] application - 
2012-06-20T01:49:22+00:00 app[web.1]: 
2012-06-20T01:49:22+00:00 app[web.1]: ! @zzzzzzzzzz - Internal server error, for request [GET /list_mangas] ->
lay.core.ActionInvoker$$anonfun$receive$1$$anon$1: Execution exception [[SQLException: Timed out waiting for a free available connection.]]
java.sql.SQLException: Timed out waiting for a free available connection.

heroku上の該当のエラーログ

herokuのエラーログ

2012-06-20T01:49:20+00:00 heroku[router]: GET manga-checker.herokuapp.com/assets/js/index.js dyno=web.1 queue=0 wait=0ms service=6ms status=304 bytes=0
2012-06-20T01:49:22+00:00 app[web.1]: [error] application - 
2012-06-20T01:49:22+00:00 app[web.1]: 
2012-06-20T01:49:22+00:00 app[web.1]: ! @zzzzzzzzzz - Internal server error, for request [GET /list_mangas] ->
2012-06-20T01:49:22+00:00 app[web.1]: 
2012-06-20T01:49:22+00:00 app[web.1]: play.core.ActionInvoker$$anonfun$receive$1$$anon$1: Execution exception [[SQLException: Timed out waiting for a free available connection.]]
2012-06-20T01:49:22+00:00 app[web.1]:   at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:82) [play_2.9.1-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 app[web.1]:   at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:63) [play_2.9.1-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 heroku[router]: GET manga-checker.herokuapp.com/list_mangas dyno=web.1 queue=0 wait=0ms service=1016ms status=500 bytes=1930
2012-06-20T01:49:22+00:00 app[web.1]:   at akka.actor.Actor$class.apply(Actor.scala:290) [akka-actor-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 app[web.1]:   at play.core.ActionInvoker.apply(Invoker.scala:61) [play_2.9.1-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 app[web.1]:   at akka.actor.ActorCell.invoke(ActorCell.scala:617) [akka-actor-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 app[web.1]:   at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:179) [akka-actor-2.0.jar:2.0]
2012-06-20T01:49:22+00:00 app[web.1]: Caused by: java.sql.SQLException: Timed out waiting for a free available connection.
2012-06-20T01:49:22+00:00 app[web.1]:   at com.jolbox.bonecp.BoneCP.getConnection(BoneCP.java:503) ~[bonecp-0.7.1.RELEASE.jar:0.7.1.RELEASE]
2012-06-20T01:49:22+00:00 app[web.1]:   at com.jolbox.bonecp.BoneCPDataSource.getConnection(BoneCPDataSource.java:114) ~[bonecp-0.7.1.RELEASE.jar:0.7.1.RELEASE]