我正在建立一个新的多模块项目(sbt / scala / play / IntejjiJ),我想做两件事:
project
|_Dependencies.scala
|_plugin.sbt
modules
|_adapters
|_api (Play REST API)
|_app
|_conf
|_infrastructure (bare bone scala)
|-src/main/scala
|_application (bare bone scala)
|_src/main/scala
|_domain (bare bone scala)
|_src/main/scala
|_query (bare bone scala)
|_src/main/scala
build.sbt
到目前为止,使用Play2的“运行/调试配置”设置运行应用程序时出现以下错误:
[error] java.lang.RuntimeException: No main class detected.
[error] at scala.sys.package$.error(package.scala:26)
[error] (Compile / bgRun) No main class detected.
[error] Total time: 2 s, completed Jun 1, 2019 11:21:31 PM
这是我到目前为止的内容:
build.sbt
import Dependencies._
lazy val commonSettings = Seq(
organization := "com.borkke.rally",
version := "0.1.0-SNAPSHOT",
scalaVersion := "2.12.8",
scalacOptions := Seq(
"-deprecation",
"-feature"
),
libraryDependencies ++= CommonDependencies
)
//PROJECTS
lazy val rally = project
.in(file("."))
.aggregate(domain,application,query,api,infrastructure)
.settings(
name := "rally",
commonSettings,
publishArtifact := false
)
lazy val api = project
.in(file("modules/adapter/api"))
.enablePlugins(PlayScala)
.dependsOn(domain,application,query,infrastructure)
.settings(
name := "api",
commonSettings,
libraryDependencies ++= ApiDependencies
)
lazy val domain = project
.in(file("modules/domain"))
.settings(
name := "domain",
commonSettings
)
lazy val application = project
.in(file("modules/application"))
.dependsOn(domain)
.settings(
name := "application",
commonSettings
)
lazy val query = project
.in(file("modules/query"))
.settings(
name := "query",
commonSettings
)
lazy val infrastructure = project
.in(file("modules/adapter/infrastructure"))
.dependsOn(domain)
.settings(
name := "infrastructure",
commonSettings,
libraryDependencies ++= InfrastructureDependencies
)
Dependencies.scala
import sbt._
import play.sbt.PlayImport._
object Dependencies {
private val scalatest_version = "3.0.5"
private val v2Db_version = "1.4.198"
private val logback_version = "5.3"
private val play_version = "2.7.2"
private val cassandra_driver_version = "3.7.1"
private val postgresql_driver_version = "42.2.5"
private val kafka_client_version = "2.2.0"
private val scalatest = "org.scalatest" %% "scalatest" % scalatest_version
private val scalatic = "org.scalactic" %% "scalactic" % scalatest_version
private val h2Db = "com.h2database" %% "h2" % v2Db_version
private val logback = "net.logstash.logback" % "logstash-logback-encoder" % logback_version
private val play = "com.typesafe.play" %% "play" % play_version
private val cassandra_driver = "com.datastax.cassandra" % "cassandra-driver-extras" % cassandra_driver_version
private val postgresql_driver = "org.postgresql" % "postgresql" % postgresql_driver_version
private val kafka_client = "org.apache.kafka" %% "kafka" % kafka_client_version
lazy val CommonDependencies = Seq(scalatic, scalatest % "test", logback, guice)
lazy val InfrastructureDependencies = Seq(cassandra_driver, postgresql_driver, kafka_client)
lazy val ApiDependencies = Seq(play)
}
plugin.sbt
logLevel := Level.Warn
//wrapper around play console.
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.7.2")
//dependency resolver. parallel downloads
addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.1.0-M11")
//shows available updates. dependencyUpdates || dependencyUpdatesReport
addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.4.0")
//create one jar for application.
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.5")
//linter
addSbtPlugin("org.wartremover" % "sbt-wartremover" % "2.2.1")
考虑更改构建结构,api
以使其变为根项目,如下所示:
lazy val api = project
.in(file("."))
.enablePlugins(PlayScala)
.aggregate(domain,application,query,infrastructure)
.dependsOn(domain,application,query,infrastructure)
.settings(
name := "api",
commonSettings,
publishArtifact := false,
libraryDependencies ++= ApiDependencies
)
这意味着modules/adapters/api
将移至项目根目录,并lazy val root = ...
从中build.sbt
将其删除,以便目录结构变为
.
├── app
│ ├── controllers
│ ├── filters
│ ├── services
│ └── views
├── build.sbt
├── conf
│ ├── application.conf
│ ├── logback.xml
│ └── routes
├── modules
│ ├── adapters
│ │ └── infrastructure
│ ├── application
│ │ ├── src
│ ├── domain
│ │ ├── src
│ └── query
│ ├── src
├── project
│ ├── Dependencies.scala
│ ├── build.properties
│ ├── plugins.sbt
│ ├── project
│ └── target
Play 2 App
尽管可以通过以下方法确保启用了Play编译器,这应该可以使运行配置再次起作用:
Preferences | Languages & Frameworks | Play2 | Compiler | Use Play 2 compiler for this project
如果希望保留原始结构,请尝试定义sbt Task
运行配置,而不是Play 2 App
,如官方文档中所述:
Run | Edit Configurations
+
以添加新配置sbt Task
tasks
输入框中放api/run
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我来说两句