为什么使用“Slick”和“PostgreSQL”找不到合适的驱动程序,Play

这是我遇到的错误：

[SQLException: No suitable driver found for postgres://user:password@localhost:5432/postgres]
56  
57  def instance = Action {
58    Database.forURL("postgres://user:password@localhost:5432/postgres",driver = "org.postgresql.Driver") withSession {
59      val q = Retailer.map(_.name)
60      Ok(views.html.instance(q.list,newRForm))
61    }
62  }
63

用户和密码分别是Postgres数据库的用户名和密码。

在java error (No suitable driver found)我发现：

>您需要使用Class.forName(“org.postgresql.Driver”)将驱动程序加载到某个地方;
>您将在程序的类路径中使用PostgreSQL驱动程序的jar文件。

在Application.scala中，我有以下代码块：

{
  println(ConfigFactory.load().getString("db.default.url"))
  println(Class.forName("org.postgresql.Driver"))
}

重播运行编译结果：

(Server started,use Ctrl+D to stop and go back to the console...)

[info] play - database [default] connected at jdbc:postgresql://localhost:5432/postgres
[info] play - Application started (Dev)
postgres://user:password@localhost:5432/postgres
class org.postgresql.Driver
[error] application -

! @6ei1nhkop - Internal server error,for (GET) [/instance] ->

play.api.Application$$anon$1: Execution exception[[SQLException: No suitable driver found for jdbc:postgresql://user:password@localhost:5432/postgres]]
        at play.api.Application$class.handleError(Application.scala:289) ~[play_2.10.jar:2.1.1]
        at play.api.DefaultApplication.handleError(Application.scala:383) [play_2.10.jar:2.1.1]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$17$$anonfun$apply$24.apply(PlayDefaultUpstreamHandler.scala:326) [play_2.10.jar:2.1.1]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$17$$anonfun$apply$24.apply(PlayDefaultUpstreamHandler.scala:324) [play_2.10.jar:2.1.1]
        at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.1]
        at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.1]
java.sql.SQLException: No suitable driver found for jdbc:postgresql://user:password@localhost:5432/postgres
        at java.sql.DriverManager.getConnection(Unknown Source) ~[na:1.7.0_21]
        at java.sql.DriverManager.getConnection(Unknown Source) ~[na:1.7.0_21]
        at scala.slick.session.Database$$anon$2.createConnection(Database.scala:105) ~[slick_2.10-1.0.0.jar:1.0.0]
        at scala.slick.session.BaseSession.conn$lzycompute(Session.scala:207) ~[slick_2.10-1.0.0.jar:1.0.0]
        at scala.slick.session.BaseSession.conn(Session.scala:207) ~[slick_2.10-1.0.0.jar:1.0.0]
        at scala.slick.session.BaseSession.close(Session.scala:221) ~[slick_2.10-1.0.0.jar:1.0.0]

然后我运行播放依赖和postgres .jar解决！

Here are the resolved dependencies of your application:
+--------------------------------------------------------+--------------------------------------------------------+-----------------------------------+
| ←[32mpostgresql:postgresql:9.1-901-1.jdbc4←[0m         | ←[37mats:ats_2.10:1.0-SNAPSHOT←[0m                     | ←[37mAs postgresql-9.1-901-1.jdbc4.jar←[0m |
+--------------------------------------------------------+--------------------------------------------------------+-----------------------------------+

为什么找不到合适的司机？

CONF / application.conf

# Database configuration
db.default.driver=org.postgresql.Driver
db.default.url="jdbc:postgres://user:password@localhost:5432/postgres"
db.default.user=user    
db.default.password=password

项目/ Build.scala

import sbt._
import Keys._
import play.Project._

object ApplicationBuild extends Build {

  val appName    = "ats"
  val appVersion = "1.0-SNAPSHOT"

  val appDependencies = Seq(
    // Add your project dependencies here,jdbc,"com.typesafe.slick" %% "slick"      % "1.0.0","postgresql"         %  "postgresql" % "9.1-901-1.jdbc4"
  )

  val main = play.Project(appName,appVersion,appDependencies).settings(
    // Add your own project settings here    
  )

我的/ lib文件中还有postgresql-9.2-1002.jdbc4.jar和slick_2.10-1.0.1-RC1.jar，我的本地Postgres版本从做一个SELECT version();是9.2.4 Postgres驱动程序的分辨率似乎解决了9.1 .jar，但是当我注释到应用程序的依赖关系让/ lib被包含在自己的位置时，/ lib似乎不在Play的CLASSPATH中。

我知道Postgres url是正确的，当我的应用程序第一次启动时，我可以连接到我的数据库。