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Creating API using scala Akka, code is running in IDE but when jar is created not able to run the code:
usind scala 2.11.12 and Below is build.sbt

ThisBuild / version := "0.1.0-SNAPSHOT"
ThisBuild / scalaVersion := "2.11.12"

lazy val root = (project in file("."))
  .settings(
    name := "JNPM_SCALA_DATA_API",
    // Ensure that the IDE-specific settings like 'idePackagePrefix' are necessary or correctly configured.
    idePackagePrefix := Some("org.jio.jnpm"),
    // Adding resolver within project settings
    resolvers += "Typesafe Repo" at "https://repo.typesafe.com/typesafe/releases/",
    // Library dependencies
    libraryDependencies ++= Seq(
      "com.typesafe.akka" %% "akka-http" % "10.0.15",  // Updated to stable version
      "com.typesafe.akka" %% "akka-actor" % "2.4.20",
      "com.typesafe.akka" %% "akka-stream" % "2.4.20",
      "com.typesafe.akka" %% "akka-http-spray-json" % "10.0.15"  // JSON library for Akka HTTP
    ),
    // Assembly settings
//    assembly / assemblyMergeStrategy := {
//      case PathList("META-INF", xs @ _*) => MergeStrategy.discard
//      case "application.conf" => MergeStrategy.concat
//      case _ => MergeStrategy.first
//    }
//  )
    assembly / assemblyMergeStrategy := {
      case PathList("META-INF", xs @ _*) => MergeStrategy.discard
      case "application.conf" => MergeStrategy.concat
      case _ => MergeStrategy.first
    }
  )

Below is application.conf:

akka {
  loglevel = "INFO"
  actor {
    default-dispatcher {
      type = "Dispatcher"
      executor = "fork-join-executor"
      fork-join-executor {
        parallelism-min = 2
        parallelism-factor = 2.0
        parallelism-max = 10
      }
    }
  }
  stream {
    materializer {
      initial-input-buffer-size = 16
      max-input-buffer-size = 128
    }
  }
}

Main method :

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.model.{HttpResponse, StatusCodes}
import akka.http.scaladsl.model.StatusCodes._
import akka.http.scaladsl.server.Route
import models.{JsonSupport, ReportPayload}

import scala.concurrent.ExecutionContextExecutor
import akka.stream.ActorMaterializerSettings
import akka.http.scaladsl.server.RouteResult.route2HandlerFlow
import com.typesafe.config.ConfigFactory

object WebServer extends JsonSupport{
  def main(args: Array[String]): Unit = {

    implicit val system: ActorSystem = ActorSystem("akkaHttpServer", ConfigFactory.load())

    println("Dispatcher Config: " + system.settings.config.getConfig("akka.actor.default-dispatcher"))

    val materializerSettings = ActorMaterializerSettings(system).withDispatcher("akka.actor.default-dispatcher") //default-dispatcher
    implicit val materializer: ActorMaterializer = ActorMaterializer(materializerSettings)(system)

    implicit val executionContext: ExecutionContextExecutor = system.dispatcher

    val route: Route = concat(

      get {
        path("hello") {
          complete(HttpResponse(OK, entity = "Hello from Akka HTTP!"))
        }
      },
      post {
        path("echo") {
          entity(as[String]) { body =>
            complete(HttpResponse(OK, entity = body))  // Echoes back the posted content
          }
        }
      },

      post {
        path("jnpm" / "pm" / "data" / "network_element") {
          entity(as[ReportPayload]) { reportPayload =>
            // Log received report details (simple console output for demonstration).
            println(s"Received report for user: ${reportPayload.user_id}")
            // Responds with a confirmation message.
            complete(StatusCodes.OK, s"Report for ${reportPayload.report_name} received and is being processed.")
          }
        }
      }
    )

    import akka.http.scaladsl.server.RouteResult._
    val bindingFuture = Http().bindAndHandle(route, "0.0.0.0", 8088)
    println(s"Server online at http://localhost:8080/nPress RETURN to stop...")
    scala.io.StdIn.readLine() // Blocks here to keep the app running until the ENTER key is pressed.
    bindingFuture
      .flatMap(_.unbind()) // Disconnects the server from the port.
      .onComplete(_ => system.terminate()) // Shuts down the actor system to clean up resources.
  }
}

Getting below error :

Loading config from properties {java.runtime.name=Java(TM) SE Runtime Environment, sun.boot.library.path=C:Program Files (x86)Javajre-1.8bin, java.vm.version=25.371-b11, java.vm.vendor=Oracle Corporation, java.vendor.url=http://java.oracle.com/, path.separator=;, java.vm.name=Java HotSpot(TM) Client VM, file.encoding.pkg=sun.io, user.script=, user.country=IN, sun.java.launcher=SUN_STANDARD, sun.os.patch.level=, java.vm.specification.name=Java Virtual Machine Specification, user.dir=C:SCALA_SPARKJNPM_SCALA_DATA_APItargetscala-2.11, java.runtime.version=1.8.0_371-b11, java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment, java.endorsed.dirs=C:Program Files (x86)Javajre-1.8libendorsed, os.arch=x86, java.io.tmpdir=C:UsersVIVEKA~1.DESAppDataLocalTemp, line.separator=
, java.vm.specification.vendor=Oracle Corporation, user.variant=, os.name=Windows 11, sun.jnu.encoding=Cp1252, java.library.path=C:Program Files (x86)Common FilesOracleJavajavapath;C:WindowsSunJavabin;C:Windowssystem32;C:Windows;C:Program Files (x86)Common FilesOracleJavajavapath;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:WindowsSystem32OpenSSH;C:Program FilesWindowsPowerShellScripts;C:WindowsCCM;C:WindowsCCM;C:WindowsCCM;C:Program Files (x86)Enterprise VaultEVClientx64;C:WindowsCCM;C:WindowsCCM;C:WindowsCCM;C:UsersVivekanand.DesaiAppDataLocalProgramsPythonPython310Scripts;C:UsersVivekanand.DesaiAppDataLocalProgramsPythonPython310;C:UsersVivekanand.DesaiAppDataLocalProgramsPythonLauncher;C:UsersVivekanand.DesaiAppDataLocalMicrosoftWindowsApps;C:appshadoopbin;C:appsspark-3.5.0-bin-hadoop3spark-3.5.0-bin-hadoop3bin;C:appsspark-3.5.0-bin-hadoop3spark-3.5.0-bin-hadoop3sbin;C:Javajre-8u202-windows-x64jre1.8.0_202bin;;., java.specification.name=Java Platform API Specification, java.class.version=52.0, sun.management.compiler=HotSpot Client Compiler, os.version=10.0, user.home=C:UsersVivekanand.Desai, user.timezone=, java.awt.printerjob=sun.awt.windows.WPrinterJob, file.encoding=Cp1252, java.specification.version=1.8, user.name=Vivekanand.Desai, java.class.path=JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar, java.vm.specification.version=1.8, sun.arch.data.model=32, java.home=C:Program Files (x86)Javajre-1.8, sun.java.command=JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar, java.specification.vendor=Oracle Corporation, user.language=en, awt.toolkit=sun.awt.windows.WToolkit, config.trace=loads, java.vm.info=mixed mode, java.version=1.8.0_371, java.ext.dirs=C:Program Files (x86)Javajre-1.8libext;C:WindowsSunJavalibext, sun.boot.class.path=C:Program Files (x86)Javajre-1.8libresources.jar;C:Program Files (x86)Javajre-1.8librt.jar;C:Program Files (x86)Javajre-1.8libjsse.jar;C:Program Files (x86)Javajre-1.8libjce.jar;C:Program Files (x86)Javajre-1.8libcharsets.jar;C:Program Files (x86)Javajre-1.8libjfr.jar;C:Program Files (x86)Javajre-1.8classes, sun.stderr.encoding=cp437, java.vendor=Oracle Corporation, java.specification.maintenance.version=4, file.separator=, java.vendor.url.bug=http://bugreport.sun.com/bugreport/, sun.cpu.endian=little, sun.io.unicode.encoding=UnicodeLittle, sun.stdout.encoding=cp437, sun.desktop=windows, sun.cpu.isalist=}
Loading config from resource 'application.conf' URL jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/application.conf from class loader sun.misc.Launcher$AppClassLoader@647e05
Loading config from a URL: jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/application.conf
URL sets Content-Type: 'content/unknown'
'content/unknown' isn't a known content type
Loading config from class loader sun.misc.Launcher$AppClassLoader@647e05 but there were no resources called application.json
exception loading application.json: java.io.IOException: resource not found on classpath: application.json
Loading config from class loader sun.misc.Launcher$AppClassLoader@647e05 but there were no resources called application.properties
exception loading application.properties: java.io.IOException: resource not found on classpath: application.properties
Loading config from resource 'reference.conf' URL jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/reference.conf from class loader sun.misc.Launcher$AppClassLoader@647e05
Loading config from a URL: jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/reference.conf
URL sets Content-Type: 'content/unknown'
'content/unknown' isn't a known content type
Looking for 'version.conf' relative to ParseableResourceURL(jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/reference.conf)
Looking for 'version.json' relative to ParseableResourceURL(jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/reference.conf)
Looking for 'version.properties' relative to ParseableResourceURL(jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/reference.conf)
Loading config from resource 'version.conf' URL jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/version.conf from class loader sun.misc.Launcher$AppClassLoader@647e05
Loading config from a URL: jar:file:/C:/SCALA_SPARK/JNPM_SCALA_DATA_API/target/scala-2.11/JNPM_SCALA_DATA_API-assembly-0.1.0-SNAPSHOT.jar!/version.conf
URL sets Content-Type: 'content/unknown'
'content/unknown' isn't a known content type
Loading config from class loader sun.misc.Launcher$AppClassLoader@647e05 but there were no resources called version.json
exception loading version.json: java.io.IOException: resource not found on classpath: version.json
Loading config from class loader sun.misc.Launcher$AppClassLoader@647e05 but there were no resources called version.properties
exception loading version.properties: java.io.IOException: resource not found on classpath: version.properties
Loading config from a String resizer.enabled=on
Dispatcher Config: Config(SimpleConfigObject({"executor":"fork-join-executor","fork-join-executor":{"parallelism-factor":2,"parallelism-max":10,"parallelism-min":2},"type":"Dispatcher"}))
Exception in thread "main" com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'dispatcher'
        at com.typesafe.config.impl.SimpleConfig.findKeyOrNull(SimpleConfig.java:152)
        at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:170)
        at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:184)
        at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:189)
        at com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:246)
        at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:267)
        at akka.stream.ActorMaterializerSettings$.apply(ActorMaterializer.scala:258)
        at org.jio.jnpm.WebServer$.main(WebServer.scala:31)
        at org.jio.jnpm.WebServer.main(WebServer.scala)

Code run fine in IDE but not using jar file. It is looking for keyword dispatcher not sure where its is looking

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Danh mục

Scala Akka Http : com.typesafe.config.ConfigException$Missing: No configuration setting found for key ‘dispatcher’