Slick and bonecp: org.postgresql.util.PSQLException: FATAL: sorry, too many clients already error

Locally when I am developing my application I launch my play2 application using `sbt run` I love how I can make code changes, and then reload my browser to see my changes. After about roughly 10 code changes or so, I get a postgresql too many connection error (see below). My db connection is using the below DatabaseAccess.scala class. I'm guessing on each reload it is creating a bunch of connections to postgresql. In my Global am currently doing: ``` override def onStart(app: Application) { Logger.info("Global.onStart") DatabaseAccess.loadConfiguration() } ``` In production I am also worried that if I make multiple deploys in a short period of time, or start/stop my service I might run into this problem also. How can I ensure all connections are destroyed? I know I can either put something in the onStart or OnStop but I'm not really sure how to clear the connections that might have existed previously. (assuming this isn't a bug) I did create a release() method that I was calling on onStop but that didn't seem to work: ``` def release() { configs = Map[String, BoneCPConfig]() dataSources = Map[String, BoneCPDataSource]() databases = dataSources.map { case(key, value) => (key, Database.forDataSource(value)) } } ``` All I did was re-init the vars so I guess that wasn't really what I needed to do. My data access pattern is as follows: ``` def getById(userId: Int): Option[User] = { db.withSession { implicit session => return userDao.getById(userId) } } ``` My database access class looks like: https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/unfiltered/src/main/scala/DatabaseAccess.scala My application.conf connection looks like: ``` #postgresql db.default.driver="org.postgresql.Driver" db.default.url = "jdbc:postgresql://localhost/testweb_development" db.default.user = "testdbuser" db.default.password = "" db.default.minConnections = 4 db.default.maxConnections = 24 db.default.maxThreads = 2 ``` Locally when developing after about approximately 10 code changes and sbt doing it's nice partial class reloads I get this error: ``` play.api.Application$$anon$1: Execution exception[[SQLException: Unable to open a test connection to the given database. JDBC url = jdbc:postgresql://localhost/testweb_development, username = testdbuser. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------ org.postgresql.util.PSQLException: FATAL: sorry, too many clients already at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66) at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:125) at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30) at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22) at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:30) at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24) at org.postgresql.Driver.makeConnection(Driver.java:393) at org.postgresql.Driver.connect(Driver.java:267) at java.sql.DriverManager.getConnection(DriverManager.java:582) at java.sql.DriverManager.getConnection(DriverManager.java:185) at com.jolbox.bonecp.BoneCP.obtainRawInternalConnection(BoneCP.java:363) at com.jolbox.bonecp.BoneCP.<init>(BoneCP.java:416) at com.jolbox.bonecp.BoneCPDataSource.getConnection(BoneCPDataSource.java:120) at scala.slick.jdbc.JdbcBackend$DatabaseFactoryDef$$anon$4.createConnection(JdbcBackend.scala:47) at scala.slick.jdbc.JdbcBackend$BaseSession.conn$lzycompute(JdbcBackend.scala:302) at scala.slick.jdbc.JdbcBackend$BaseSession.conn(JdbcBackend.scala:302) at scala.slick.jdbc.JdbcBackend$BaseSession.close(JdbcBackend.scala:316) at scala.slick.backend.DatabaseComponent$DatabaseDef$class.withSession(DatabaseComponent.scala:31) at scala.slick.jdbc.JdbcBackend$DatabaseFactoryDef$$anon$4.withSession(JdbcBackend.scala:46) at com.exampleapp.services.UserServiceImpl.getById(UserService.scala:37) at controllers.UsersController$$anonfun$show$1.apply(UsersController.scala:84) at controllers.UsersController$$anonfun$show$1.apply(UsersController.scala:76) at play.api.mvc.ActionBuilder$$anonfun$apply$10.apply(Action.scala:221) at play.api.mvc.ActionBuilder$$anonfun$apply$10.apply(Action.scala:220) at controllers.ActionWithContext$.invokeBlock(BaseController.scala:42) at play.api.mvc.ActionBuilder$$anon$1.apply(Action.scala:309) at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:109) at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:109) at play.utils.Threads$.withContextClassLoader(Threads.scala:18) at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:108) at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:107) at scala.Option.map(Option.scala:145) at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:107) at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:100) at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:481) at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:481) at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:517) at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:517) at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:493) at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:493) at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:42) at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386) at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) ``` Environment ``` I am running scala 2.10.3, play 2.2.3 I am launching my app using sbt run. Postgresql driver version: 9.1-901.jdbc4 slick version: 2.0.1 bonecp version: 0.8.0.RELEASE ```