为什么使用Slick和PostgreSQL时，播放操作会失败，并出现“找不到合适的驱动程序”？
为什么使用Slick和PostgreSQL时，播放操作会失败，并出现“找不到合适的驱动程序”？
提问于 2013-06-12 06:02:56
我正在使用本地Postgres数据库和Slick 1.0.0编写一个使用Play Framework 2.1.1的Scala web应用程序，而我在这里遇到了一个似乎矛盾的问题。
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其中user和password分别是Postgres数据库的username和password。
在java error (No suitable driver found)中，我发现：
您需要使用Class.forName("org.postgresql.Driver");
- You'll加载驱动程序，在程序的类路径中需要
- 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"))
} 重新运行play compile将导致：
(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play dependencies，postgres的.jar就被解析了！
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驱动程序？
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=passwordproject/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文件中也有postgresql-9.2-1002.jdbc4.jar和slick_2.10-1.0.1-RC1.jar，我的本地postgres版本的SELECT version();是9.2.4 Postgres驱动程序解析似乎要解析到9.1 .jar，当我注释掉应用程序的依赖性，让/lib独立包含时，/lib似乎不在Play的CLASSPATH上。
我知道Postgres url是正确的，并且当我的应用程序第一次启动时，我能够连接到我的数据库。
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原文链接：
https://stackoverflow.com/questions/17054620
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