找不到键 'akka.version' 的配置设置

Question

我正在学习 akka-remoting，这就是我的项目的样子

项目结构看起来像

project/pom.xml
project/mymodule/pom.xml
project/mymodule/src/main/resources/application.conf
project/mymodule/src/main/scala/com.harit.akkaio.remote.RemoteApp.scala
project/mymodule/src/main/scala/com.harit.akkaio.remote.ProcessingActor.scala

当我运行我在 command-line 上的项目时，我看到

$ java -jar akkaio-remote/target/akka-remote-jar-with-dependencies.jar com.harit.akkaio.remote.RemoteApp
Hello:com.harit.akkaio.remote.RemoteApp
Exception in thread "main" com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'akka.version'
    at com.typesafe.config.impl.SimpleConfig.findKey(SimpleConfig.java:124)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:145)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:151)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:159)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:164)
    at com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:206)
    at akka.actor.ActorSystem$Settings.<init>(ActorSystem.scala:169)
    at akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:505)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:142)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:119)
    at com.harit.akkaio.remote.RemoteApp$.startProcessingActorSystem(RemoteApp.scala:16)
    at com.harit.akkaio.remote.RemoteApp$.main(RemoteApp.scala:12)
    at com.harit.akkaio.remote.RemoteApp.main(RemoteApp.scala)

RemoteApp.scala

package com.harit.akkaio.remote

import akka.actor.{ActorRef, ActorSystem, Props}
import com.typesafe.config.ConfigFactory

import scala.concurrent.duration._

object RemoteApp {
  def main(args: Array[String]): Unit = {
    println("Hello:" + args.head)
      startProcessingActorSystem()
  }

  def startProcessingActorSystem() = {
    val system = ActorSystem("ProcessingSystem", ConfigFactory.load())
    println("ProcessingActorSystem Started")
  }
}

ProcessingActor.scala

package com.harit.akkaio.remote

import akka.actor.{Actor, ActorLogging}

case object Process

case object Crash

class ProcessingActor extends Actor with ActorLogging {
  def receive = {
    case Process => log.info("processing big things")
    case Crash => log.info("crashing the system")
      context.stop(self)
  }
}

application.conf

akka {
  remote.netty.tcp.port = 2552
}

mymodule.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>akkaio</artifactId>
        <groupId>com.harit</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>akkaio-remote</artifactId>

    <properties>
        <akka-remote_2.11.version>2.3.11</akka-remote_2.11.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-remote_2.11</artifactId>
            <version>${akka-remote_2.11.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <finalName>akka-remote</finalName>
                    <archive>
                        <manifest>
                            <mainClass>com.harit.akkaio.remote.RemoteApp</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id> <!-- this is used for inheritance merges -->
                        <phase>package</phase> <!-- bind to the packaging phase -->
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.harit</groupId>
    <artifactId>akkaio</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>akkaio-remote</module>
    </modules>

    <packaging>pom</packaging>
    <inceptionYear>2015</inceptionYear>
    <properties>
        <scala.version>2.11.6</scala.version>
        <junit.version>4.12</junit.version>
        <scalatest_2.11.version>2.2.5</scalatest_2.11.version>
        <akka-actor_2.11.version>2.3.11</akka-actor_2.11.version>
        <akka-slf4j_2.11.version>2.3.11</akka-slf4j_2.11.version>
        <akka-testkit_2.11.version>2.3.11</akka-testkit_2.11.version>
        <mockito-all.version>1.10.19</mockito-all.version>
        <maven-scala-plugin.scalaCompatVersion>2.11.6</maven-scala-plugin.scalaCompatVersion>
        <scalatest-maven-plugin.version>1.0</scalatest-maven-plugin.version>
    </properties>

    <repositories>
        <repository>
            <id>scala-tools.org</id>
            <name>Scala-Tools Maven2 Repository</name>
            <url>http://scala-tools.org/repo-releases</url>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>scala-tools.org</id>
            <name>Scala-Tools Maven2 Repository</name>
            <url>http://scala-tools.org/repo-releases</url>
        </pluginRepository>
    </pluginRepositories>

    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-actor_2.11</artifactId>
            <version>${akka-actor_2.11.version}</version>
        </dependency>
        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-slf4j_2.11</artifactId>
            <version>${akka-slf4j_2.11.version}</version>
        </dependency>
        <dependency>
            <groupId>org.scalatest</groupId>
            <artifactId>scalatest-maven-plugin</artifactId>
            <version>${scalatest-maven-plugin.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-testkit_2.11</artifactId>
            <version>${akka-testkit_2.11.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.scalatest</groupId>
            <artifactId>scalatest_2.11</artifactId>
            <version>${scalatest_2.11.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <defaultGoal>clean install</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <scalaCompatVersion>${maven-scala-plugin.scalaCompatVersion}</scalaCompatVersion>
                    <scalaVersion>${scala.version}</scalaVersion>
                    <scalaVersion>${scala.version}</scalaVersion>
                    <args>
                        <arg>-target:jvm-1.8</arg>
                    </args>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.7</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.scalatest</groupId>
                <artifactId>scalatest-maven-plugin</artifactId>
                <version>1.0</version>
                <configuration>
                    <reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
                    <junitxml>.</junitxml>
                    <filereports>WDF TestSuite.txt</filereports>
                </configuration>
                <executions>
                    <execution>
                        <id>test</id>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    <reporting>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <configuration>
                    <scalaVersion>${scala.version}</scalaVersion>
                </configuration>
            </plugin>
        </plugins>
    </reporting>
</project>

我错过了什么？谢谢

Answer 1

您的问题似乎是捆绑到一个 jar-with-dependencies 中，这会导致 Akka 出现问题，如 documentation:

中所述

Warning

Akka's configuration approach relies heavily on the notion of every module/jar having its own reference.conf file, all of these will be discovered by the configuration and loaded. Unfortunately this also means that if you put/merge multiple jars into the same jar, you need to merge all the reference.confs as well. Otherwise all defaults will be lost and Akka will not function.

同页提示，可以使用maven-shade-plugin合并所有参考配置：

If you are using Maven to package your application, you can also make use of the Apache Maven Shade Plugin support for Resource Transformers to merge all the reference.confs on the build classpath into one.

另请参阅：Akka: missing akka.version

Answer 2

遇到了类似的问题：

com.typesafe.config.ConfigException$Missing: 
No configuration setting found for key 'akka.persistence.journal-plugin-fallback'

通过添加一个附加转换器解决了这个问题：

<plugin>
  <artifactId>maven-shade-plugin</artifactId>
  <version>2.4.1</version>
  <executions>
    <execution>
      <phase>package</phase>
      <goals>
        <goal>shade</goal>
      </goals>
      <configuration>
        <transformers>
          <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
            <resource>reference.conf</resource>
          </transformer>
        </transformers>
      </configuration>
    </execution>
  </executions>
</plugin>

Answer 3

单独添加 AppendingTransformer 并没有解决我的问题。如果您尝试在 EMR 上部署您的 Spark 应用程序并且仍然面临这个问题，请查看我的解决方案。希望对您有所帮助！

Answer 4

我试过这个插件，它很棒但是由于一些签名的 jar 导致了另一个错误。这是错误：

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes

我建议您使用 spring boot maven 插件。只需将它添加到您的构建中并享受无缝可运行的罐子。这是我喜欢 Spring 框架的一个很好的原因。

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
            <configuration>
                <classifier>final</classifier>
                <mainClass>
                    com.main.PopularHashTags
                </mainClass>
            </configuration>
        </execution>
    </executions>
</plugin>

注意：您无需 Spring 启动应用程序即可使用此插件。只需在任何应用程序中使用它，它就像一个魅力。

Answer 5

所以问题是在制作一个 fat jar 但没有以正确的方式处理 reference.conf 时产生的。

解释来自@Zoltan 的回答：

It seems that your problem is bundling into a jar-with-dependencies, which causes problems with Akka, as described in the documentation:

Warning

Akka's configuration approach relies heavily on the notion of every module/jar having its own reference.conf file, all of these will be discovered by the configuration and loaded. Unfortunately this also means that if you put/merge multiple jars into the same jar, you need to merge all the reference.confs as well. Otherwise all defaults will be lost and Akka will not function.

我有一个不需要插件的 SBT 用户解决方案。

在 build.sbt 中，将 case "reference.conf" => MergeStrategy.concat 添加到您的模块装配配置中。

lazy val module_name = (project in file("module_path"))
  .settings(
    name := "module_name",
    commonSettings,
    assemblyJarName in assembly := "module_name.jar",
    test in assembly := {},
    assemblyMergeStrategy in assembly := {
      case PathList("META-INF", xs @ _*) => MergeStrategy.discard

    #################### The line which needs to be added ###################
      case "reference.conf" => MergeStrategy.concat
      case _ => MergeStrategy.first
    }
  )
  .dependsOn(other_modules, other_modules2)

命令MergeStrategy.concat字面上的功能相同。每当遇到 reference.conf 时，它都会将其连接起来，而不是为每个 akka 模块创建一个单独的文件（这是默认行为）。

有使用maven经验的人(pom.xml)，拜托了！扩展这个答案。

Answer 6

添加以下插件：

<plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-shade-plugin</artifactId>
 <version>1.5</version>
 <executions>
  <execution>
   <phase>package</phase>
   <goals>
    <goal>shade</goal>
   </goals>
   <configuration>
    <shadedArtifactAttached>true</shadedArtifactAttached>
    <shadedClassifierName>allinone</shadedClassifierName>
    <artifactSet>
     <includes>
      <include>*:*</include>
     </includes>
    </artifactSet>
    <transformers>
      <transformer
       implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
       <resource>reference.conf</resource>
      </transformer>
      <transformer
       implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
       <manifestEntries>
        <Main-Class>akka.Main</Main-Class>
       </manifestEntries>
      </transformer>
    </transformers>
   </configuration>
  </execution>
 </executions>
</plugin>

参考：akka—docs enter link description here

Answer 7

很多提交的答案都建议一个通用的解决方案，用于设置合并策略以连接默认的类型安全配置文件（又名 reference.conf）。

这不一定适用于 Akka 库，因为 Akka 的一些配置包含在其他文件的 reference.conf 中。这包括存在于 version.conf 文件中的 akka.version 属性。

####################################
# Akka Actor Reference Config File #
####################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

# Akka version, checked against the runtime version of Akka. Loaded from generated conf file.
include "version"

因此，对于 akka 库，除了 reference.conf 策略之外，您可能还需要将该文件包含在 concat 合并策略中，因为其他第三方库可能也在做类似的事情

assemblyMergeStrategy in assembly := {
  case PathList("META-INF", "MANIFEST.MF") => 
    val log = sLog.value
    log.info("discarding MANIFEST.MF")
    MergeStrategy.discard
  case PathList("reference.conf") => 
    val log = sLog.value
    log.info("concatinating reference.conf")
    MergeStrategy.concat
  case PathList("version.conf") => 
    val log = sLog.value
    log.info("concatinating version.conf")
    MergeStrategy.concat
  case default => 
    val log = sLog.value
    log.debug(s"keeping last $default")
    MergeStrategy.last    
}

这是 alpakka 的一个常见问题，因为你的 uber jar 中的 version.conf 需要连接起来以包含来自两个库的值。所以你的 uber jar 中的 version.conf 需要看起来像这样：

akka.version = "2.6.19"
akka.kafka.version = "2.0.7"

（我的解决方案是使用 scala / sbt 及其汇编插件，但你可以为 java / maven 做类似的事情）

找不到键 'akka.version' 的配置设置

No configuration setting found for key 'akka.version'

scala

maven

akka

typesafe-stack

typesafe-config