Slick和bonecp：org.postgresql.util.PSQLException：致命：对不

我喜欢如何更改代码,然后重新加载浏览器以查看我的更改.

大约10次代码更改后,我得到一个postgresql太多的连接错误(见下文).

我的数据库连接使用下面的DatabaseAccess.scala类.

我猜测每次重新加载它都会创建一堆连接到postgresql.在我的全球目前正在做的事情：

override def onStart(app: Application) {
    Logger.info("Global.onStart")

    DatabaseAccess.loadConfiguration()
  }

在生产中我也担心如果我在短时间内进行多次部署,或者启动/停止我的服务,我也可能遇到这个问题.

如何确保所有连接都被破坏？我知道我可以在onStart或OnStop上放一些东西,但我不确定如何清除以前可能存在的连接. (假设这不是一个bug)

我确实创建了一个我在onStop上调用的release()方法,但这似乎不起作用：

def release() {
    configs = Map[String,BoneCPConfig]()
    dataSources = Map[String,BoneCPDataSource]()
    databases = dataSources.map { case(key,value) => (key,Database.forDataSource(value)) }
  }

我所做的只是重新启动变量,所以我想这不是我真正需要做的.

我的数据访问模式如下：

def getById(userId: Int): Option[User] = {
    db.withSession { implicit session =>
      return userDao.getById(userId)
    }
  }

我的数据库访问类看起来像：

https://github.com/TechEmpower/FrameworkBenchmarks/blob/master/unfiltered/src/main/scala/DatabaseAccess.scala

我的application.conf连接如下所示：

#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

在大约10次代码更改之后开发本地时,并且做了很好的部分类重新加载我得到了这个错误：

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)

环境

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