error

[felix-laofan]

Start cluster on port(s) [2551, 2552, 0]
Exception in thread "main" com.typesafe.config.ConfigException$UnresolvedSubstitution: reference.conf @ jar:file:/C:/Users/Administrator/.m2/repository/com/typesafe/akka/akka-remote_2.12/2.5.9/akka-remote_2.12-2.5.9.jar!/reference.conf: 846: Could not resolve substitution to a value: ${akka.stream.materializer}
at com.typesafe.config.impl.ConfigReference.resolveSubstitutions(ConfigReference.java:111)
at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)

[raboof]

Which sample are you running and how are you starting it?

[felix-laofan]

akka-sample-cluster-java. in eclipse Meavn project! run
public class SimpleClusterApp {

public static void main(String[] args) {
if (args.length == 0)
startup(new String[] { "2551", "2552", "0" });
else
startup(args);
}

public static void startup(String[] ports) {
for (String port : ports) {
// Override the configuration of the port
Config config = ConfigFactory.parseString(
"akka.remote.netty.tcp.port=" + port + "\n" +
"akka.remote.artery.canonical.port=" + port)
.withFallback(ConfigFactory.load());

  // Create an Akka system
  ActorSystem system = ActorSystem.create("ClusterSystem", config);

  // Create an actor that handles cluster domain events
  system.actorOf(Props.create(SimpleClusterListener.class),
      "clusterListener");

}

}
}

[felix-laofan]

UTF-8 1.8 2.5.9 com.typesafe.akka akka-actor_2.12 ${akka.version} com.typesafe.akka akka-cluster_2.12 ${akka.version} com.typesafe.akka akka-cluster-metrics_2.12 ${akka.version} com.typesafe.akka akka-slf4j_2.12 ${akka.version} ch.qos.logback logback-classic 1.2.3 com.typesafe.akka akka-testkit_2.12 ${akka.version} test

[raboof]

I suspect you are missing the akka-stream dependency.

akka-sample-cluster-java does not have a pom.xml, if we add that that would have prevented this problem, right?

[felix-laofan]

    <dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-stream_2.12</artifactId>
<version>2.5.9</version>

add akka-stream,But the problem still exists

[raboof]

Hmm, are you sure eclipse picked up the new dependency?

[felix-laofan]

[raboof]

That indeed looks good - and the error message is still exactly the same ("akka-remote_2.12-2.5.9.jar!/reference.conf: 846: Could not resolve substitution to a value: ${akka.stream.materializer}")?

[felix-laofan]

so what should i do.

[felix-laofan]

send project email to you?

[raboof]

I'm afraid I don't have time to go into such depth right now - could you post the exact error message you're getting now though?

[felix-laofan]

Exception in thread "main" com.typesafe.config.ConfigException$UnresolvedSubstitution: reference.conf @ jar:file:/C:/Users/Administrator/.m2/repository/com/typesafe/akka/akka-remote_2.12/2.5.9/akka-remote_2.12-2.5.9.jar!/reference.conf: 846: Could not resolve substitution to a value: ${akka.stream.materializer}
	at com.typesafe.config.impl.ConfigReference.resolveSubstitutions(ConfigReference.java:111)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
	at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
	at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
	at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
	at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
	at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
	at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
	at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
	at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.SimpleConfigObject$ResolveModifier.modifyChildMayThrow(SimpleConfigObject.java:379)
	at com.typesafe.config.impl.SimpleConfigObject.modifyMayThrow(SimpleConfigObject.java:312)
	at com.typesafe.config.impl.SimpleConfigObject.resolveSubstitutions(SimpleConfigObject.java:398)
	at com.typesafe.config.impl.ResolveContext.realResolve(ResolveContext.java:179)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:142)
	at com.typesafe.config.impl.ResolveContext.resolve(ResolveContext.java:231)
	at com.typesafe.config.impl.SimpleConfig.resolveWith(SimpleConfig.java:78)
	at com.typesafe.config.impl.SimpleConfig.resolve(SimpleConfig.java:68)
	at com.typesafe.config.impl.SimpleConfig.resolve(SimpleConfig.java:63)
	at com.typesafe.config.impl.SimpleConfig.resolve(SimpleConfig.java:41)
	at com.typesafe.config.impl.ConfigImpl$1.call(ConfigImpl.java:371)
	at com.typesafe.config.impl.ConfigImpl$1.call(ConfigImpl.java:364)
	at com.typesafe.config.impl.ConfigImpl$LoaderCache.getOrElseUpdate(ConfigImpl.java:65)
	at com.typesafe.config.impl.ConfigImpl.computeCachedConfig(ConfigImpl.java:92)
	at com.typesafe.config.impl.ConfigImpl.defaultReference(ConfigImpl.java:364)
	at com.typesafe.config.ConfigFactory.defaultReference(ConfigFactory.java:367)
	at com.typesafe.config.ConfigFactory.load(ConfigFactory.java:213)
	at com.typesafe.config.ConfigFactory.load(ConfigFactory.java:182)
	at com.typesafe.config.ConfigFactory$1.call(ConfigFactory.java:259)
	at com.typesafe.config.ConfigFactory$1.call(ConfigFactory.java:256)
	at com.typesafe.config.impl.ConfigImpl$LoaderCache.getOrElseUpdate(ConfigImpl.java:65)
	at com.typesafe.config.impl.ConfigImpl.computeCachedConfig(ConfigImpl.java:92)
	at com.typesafe.config.ConfigFactory.load(ConfigFactory.java:256)
	at com.typesafe.config.ConfigFactory.load(ConfigFactory.java:232)
	at sample.cluster.simple.SimpleClusterApp.startup(SimpleClusterApp.java:24)
	at sample.cluster.simple.SimpleClusterApp.main(SimpleClusterApp.java:13)

[romass12]

I am facing the same issue,what is the exact problem

[lakhanpandya]

Please help us resolve this issue, still facing it in 2019.

[johanandren]

The cause is likely that not all reference.conf files from the jars end up on the classpath, or that they are incorrectly concatenated into a single reference.conf. You will have to dig into however you are trying to run (eclipse, intellij or some build tool?) and what it does when you trigger run.

Running directly from maven or sbt, depending on which sample, in a terminal is probably a workaround.

[johanandren]

I downloaded Eclipse 2020-03 (4.15.0), opened the akka-sample-cluster-java project and was able to run each of the samples on Java 8 without any extra configuration of Eclipse or the project.

Closing this for now, we can re-open if someone still has a problem and can provide more details.