Playframework java.lang.ClassNotFoundException:play.core.server.DevServerStart
我正在尝试创建一个包含两个子项目(都是播放应用程序)的项目,这两个子项目都依赖于一个公共库,但我在运行任何一个播放应用程序时遇到了问题 这是我的build.sbt:Playframework java.lang.ClassNotFoundException:play.core.server.DevServerStart,playframework,sbt,Playframework,Sbt,我正在尝试创建一个包含两个子项目(都是播放应用程序)的项目,这两个子项目都依赖于一个公共库,但我在运行任何一个播放应用程序时遇到了问题 这是我的build.sbt: lazy val playDeps = Seq( ws, filters, evolutions, guice, "org.scalatestplus.play" %% "scalatestplus-play" % "3.1.1" % Test ) lazy val slickDeps = Seq(
lazy val playDeps = Seq(
ws,
filters,
evolutions,
guice,
"org.scalatestplus.play" %% "scalatestplus-play" % "3.1.1" % Test
)
lazy val slickDeps = Seq(
"com.typesafe.play" %% "play-slick" % "3.0.1",
"com.typesafe.play" %% "play-slick-evolutions" % "3.0.1",
"org.postgresql" % "postgresql" % "42.1.4"
)
lazy val commonDeps = Seq(
"org.scalatest" %% "scalatest" % "3.0.4" % Test
)
lazy val commonSettings = Seq(
organization := "my-org",
scalaVersion := "2.12.4",
javaOptions += "-Dconfig.file=conf/application.dev.conf"
)
lazy val root = (project in file("."))
.enablePlugins(PlayScala)
.aggregate(server, client)
.dependsOn(server, client)
lazy val common = (project in file("common"))
.settings(
name := "my-common",
version := "1.0.0",
libraryDependencies := commonDeps ++ Seq("com.typesafe.play" %% "play-json" % "2.6.7")
)
lazy val server = (project in file("server"))
.enablePlugins(PlayScala)
.dependsOn(common)
.settings(
commonSettings,
name := "my-server",
version := "1.0.0",
libraryDependencies := commonDeps ++ playDeps ++ slickDeps
)
lazy val client = (project in file("client"))
.enablePlugins(PlayScala)
.dependsOn(common)
.settings(
commonSettings,
name := "my-client",
version := "1.1.13",
libraryDependencies := Seq("org.typelevel" %% "cats" % "0.9.0") ++ commonDeps ++ playDeps ++ slickDeps
)
通过切换到服务器项目projectserver
并运行run
运行应用程序时,我收到以下错误消息:
[error] java.lang.ClassNotFoundException: play.core.server.DevServerStart
[error] at java.base/java.net.URLClassLoader.findClass(Unknown Source)
[error] at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
[error] at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
[error] at play.runsupport.Reloader$.startDevMode(Reloader.scala:227)
[error] at play.sbt.run.PlayRun$.devModeServer$lzycompute$1(PlayRun.scala:95)
[error] at play.sbt.run.PlayRun$.devModeServer$1(PlayRun.scala:79)
[error] at play.sbt.run.PlayRun$.$anonfun$playRunTask$3(PlayRun.scala:102)
[error] at play.sbt.run.PlayRun$.$anonfun$playRunTask$3$adapted(PlayRun.scala:65)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:39)
[error] at sbt.std.Transform$$anon$4.work(System.scala:66)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:262)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] at sbt.Execute.work(Execute.scala:271)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:262)
[error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:174)
[error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:36)
[error] at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
[error] at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[error] at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[error] at java.base/java.lang.Thread.run(Unknown Source)
[accuheat-server] $ [error] (Compile / run) java.lang.ClassNotFoundException: play.core.server.DevServerStart
看起来PlayScala插件没有被使用,这是我第一次尝试在同一个项目中组合两个play应用程序,因此非常感谢您的帮助
谢谢这是因为这样的台词:
libraryDependencies := commonDeps ...
在libraryDependencies上使用
:=
会导致错误。我不知道为什么,但是把它改成++=
行得通 这是因为这样的线条:
libraryDependencies := commonDeps ...
在libraryDependencies上使用
:=
会导致错误。我不知道为什么,但是把它改成++=
行得通 您是否确保没有相互冲突的依赖项ClassNotFound
表明可能存在一些二进制不兼容。感谢@JakubKozłowski,原来这与在库依赖项上使用:=
有关。您是否确保没有冲突的依赖项ClassNotFound
表明可能存在一些二进制不兼容。感谢@JakubKozłowski,原来这与在libraryDependencies
上使用:=
有关。我认为使用:=
可以覆盖原本由Play插件添加的依赖项,因此缺少类/不兼容为什么这个问题/答案没有更多的投票权?我认为通过使用:=
您已经覆盖了原本会由Play插件添加的依赖项,因此缺少类/不兼容为什么这个问题/答案没有更多的投票权?