java.lang.AbstractMethodError: io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.getScheduledExecutorService()Ljava/util/concurrent/ScheduledExecutorService;

I encountered the following stacktrace after I included "com.google.cloud" % "google-cloud-pubsub" % "1.37.1" in my project:

Caused by: java.lang.NoSuchMethodError: io.grpc.okhttp.OkHttpChannelProvider.isAndroid()Z
	at io.grpc.okhttp.OkHttpChannelProvider.priority(OkHttpChannelProvider.java:47) ~[grpc-okhttp-1.0.1.jar:1.0.1]
	at io.grpc.ManagedChannelProvider$1.getPriority(ManagedChannelProvider.java:49) ~[grpc-core-1.13.1.jar:1.13.1]
	at io.grpc.ManagedChannelProvider$1.getPriority(ManagedChannelProvider.java:41) ~[grpc-core-1.13.1.jar:1.13.1]
	at io.grpc.ServiceProviders$1.compare(ServiceProviders.java:78) ~[grpc-core-1.13.1.jar:1.13.1]
	at java.util.Collections$ReverseComparator2.compare(Collections.java:5178) ~[na:1.8.0_131]
	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:360) ~[na:1.8.0_131]
	at java.util.TimSort.sort(TimSort.java:220) ~[na:1.8.0_131]
	at java.util.Arrays.sort(Arrays.java:1512) ~[na:1.8.0_131]
	at java.util.ArrayList.sort(ArrayList.java:1454) ~[na:1.8.0_131]
	at java.util.Collections.sort(Collections.java:175) ~[na:1.8.0_131]

I then thought that the grpc-okhttp perhaps needed an upgrade, since it did not match the version of grpc-core, but upgrading resulted in another stacktrace:

Caused by: java.lang.AbstractMethodError: io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.getScheduledExecutorService()Ljava/util/concurrent/ScheduledExecutorService;
	at io.grpc.internal.CallCredentialsApplyingTransportFactory.getScheduledExecutorService(CallCredentialsApplyingTransportFactory.java:54) ~[grpc-core-1.13.1.jar:1.13.1]
	at io.grpc.internal.ManagedChannelImpl.<init>(ManagedChannelImpl.java:576) ~[grpc-core-1.13.1.jar:1.13.1]
	at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:410) ~[grpc-core-1.13.1.jar:1.13.1]
	at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createSingleChannel(InstantiatingGrpcChannelProvider.java:206) ~[gax-grpc-1.29.0.jar:1.29.0]
	at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createChannel(InstantiatingGrpcChannelProvider.java:157) ~[gax-grpc-1.29.0.jar:1.29.0]
	at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.getTransportChannel(InstantiatingGrpcChannelProvider.java:149) ~[gax-grpc-1.29.0.jar:1.29.0]
	at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:151) ~[gax-1.29.0.jar:1.29.0]
	at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:116) ~[gax-1.29.0.jar:1.29.0]
	at com.google.cloud.logging.spi.v2.GrpcLoggingRpc.<init>(GrpcLoggingRpc.java:127) ~[google-cloud-logging-1.37.1.jar:1.37.1]
	at com.google.cloud.logging.LoggingOptions$DefaultLoggingRpcFactory.create(LoggingOptions.java:64) ~[google-cloud-logging-1.37.1.jar:1.37.1]

The dependencies in build.sbt currently look like this:

libraryDependencies ++= Seq(
  "com.google.cloud" % "google-cloud-core" % "1.37.1",
  jdbc,
  cache,
  ws,
  evolutions,
  "mysql" % "mysql-connector-java" % "5.1.28",
  "com.google.cloud.sql" % "mysql-socket-factory" % "1.0.2",
  "com.roundeights" %% "hasher" % "1.2.0",
  "io.intercom" % "intercom-java" % "2.3.3",
  "com.mixpanel" % "mixpanel-java" % "1.4.2",
  "eu.inn" %% "fluentd-scala" % "0.1.13",
  "com.typesafe.play" %% "anorm" % "2.4.0",
  "com.google.firebase" % "firebase-admin" % "4.0.3",
  "org.specs2" %% "specs2-core" % "3.6.2" % "test",
  "us.raudi.pushraven" % "Pushraven" % "1.0.2",
  "com.google.cloud" % "google-cloud-speech" % "0.20.1-alpha",
  "com.google.auth" % "google-auth-library-oauth2-http" % "0.6.0",
  "com.google.cloud" % "google-cloud-logging" % "1.37.1",
  "com.google.guava" % "guava" % "25.1-jre",
  "com.github.rishabh9" %% "mdc-propagation-dispatcher" % "0.0.5",
  "com.github.nscala-time" %% "nscala-time" % "2.18.0",
  "com.google.cloud" % "google-cloud-datastore" % "1.14.0",
  "com.github.davidmoten" % "geo" % "0.7.1",
  "com.danielasfregola" %% "twitter4s" % "3.0",
  "com.google.cloud" % "google-cloud-pubsub" % "1.37.1"
)

libraryDependencies += specs2 % Test

Any idea what might be wrong?

[snthibaud]

I see. So in this case, since excludeAll is applied to google-cloud-speech and google-cloud-datastore a failure would be expected in one of those if these libraries would be incompatible by a dependency version chosen by other libraries, right?

[mmziyad]

Try this:

  // Exclusion rules
  val exclusionRules = Seq(
    ExclusionRule("io.grpc", "grpc-okhttp"),
    ExclusionRule("io.grpc", "grpc-netty"),
    ExclusionRule( "io.grpc", "grpc-core")
  )

  libraryDependencies ++= Seq(
    "com.google.cloud" % "google-cloud-core" % "1.37.1",
    jdbc,
    cache,
    ws,
    evolutions,
    "mysql" % "mysql-connector-java" % "5.1.28",
    "com.google.cloud.sql" % "mysql-socket-factory" % "1.0.2" excludeAll(exclusionRules:_*), 
    "com.roundeights" %% "hasher" % "1.2.0",
    "io.intercom" % "intercom-java" % "2.3.3",
    "com.mixpanel" % "mixpanel-java" % "1.4.2",
    "eu.inn" %% "fluentd-scala" % "0.1.13",
    "com.typesafe.play" %% "anorm" % "2.4.0",
    "com.google.firebase" % "firebase-admin" % "4.0.3" excludeAll(exclusionRules:_*),
    "org.specs2" %% "specs2-core" % "3.6.2" % "test",
    "us.raudi.pushraven" % "Pushraven" % "1.0.2",
    "com.google.cloud" % "google-cloud-speech" % "0.20.1-alpha" excludeAll(exclusionRules:_*),
    "com.google.auth" % "google-auth-library-oauth2-http" % "0.6.0" excludeAll(exclusionRules:_*),
    "com.google.cloud" % "google-cloud-logging" % "1.37.1" excludeAll(exclusionRules:_*),
    "com.google.guava" % "guava" % "25.1-jre" excludeAll(exclusionRules:_*),
    "com.github.rishabh9" %% "mdc-propagation-dispatcher" % "0.0.5",
    "com.github.nscala-time" %% "nscala-time" % "2.18.0",
    "com.google.cloud" % "google-cloud-datastore" % "1.14.0" excludeAll(exclusionRules:_*),
    "com.github.davidmoten" % "geo" % "0.7.1",
    "com.danielasfregola" %% "twitter4s" % "3.0",
    "com.google.cloud" % "google-cloud-pubsub" % "1.37.1"
  )

  libraryDependencies += specs2 % Test

I have added exclusion rules to all google-cloud dependency. You may try to remove one by one to see which dependency is injecting the conflicting io.grpc.netty version.