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recurring ServiceLocatorSessionProviderSpec failure in Scala 2.12 community build

See original GitHub issue

at e.g. https://scala-ci.typesafe.com/view/scala-2.12.x/job/scala-2.12.x-integrate-community-build/3048/consoleFull I’m seeing:

[lagom] [info] ServiceLocatorSessionProviderSpec:
[lagom] [info] com.lightbend.lagom.internal.persistence.cassandra.ServiceLocatorSessionProviderSpec *** ABORTED *** (1 millisecond)
[lagom] [info]   com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'max-queue-size'
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.findKeyOrNull(SimpleConfig.java:156)
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.findOrNull(SimpleConfig.java:174)
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:188)
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:193)
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.getConfigNumber(SimpleConfig.java:223)
[lagom] [info]   at com.typesafe.config.impl.SimpleConfig.getInt(SimpleConfig.java:234)
[lagom] [info]   at akka.persistence.cassandra.ConfigSessionProvider.<init>(ConfigSessionProvider.scala:99)
[lagom] [info]   at com.lightbend.lagom.internal.persistence.cassandra.ServiceLocatorSessionProvider.<init>(ServiceLocatorSessionProvider.scala:23)
[lagom] [info]   at com.lightbend.lagom.internal.persistence.cassandra.ServiceLocatorSessionProviderSpec.<init>(ServiceLocatorSessionProviderSpec.scala:33)
[lagom] [info]   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[lagom] [info]   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[lagom] [info]   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[lagom] [info]   at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
[lagom] [info]   at java.lang.Class.newInstance(Class.java:442)
[lagom] [info]   at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:435)
[lagom] [info]   at sbt.TestRunner.runTest$1(TestFramework.scala:76)
[lagom] [info]   at sbt.TestRunner.run(TestFramework.scala:85)
[lagom] [info]   at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202)
[lagom] [info]   at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:202)
[lagom] [info]   at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:185)
[lagom] [info]   at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202)
[lagom] [info]   at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:202)
[lagom] [info]   at sbt.TestFunction.apply(TestFramework.scala:207)
[lagom] [info]   at sbt.Tests$$anonfun$9.apply(Tests.scala:216)
[lagom] [info]   at sbt.Tests$$anonfun$9.apply(Tests.scala:216)
[lagom] [info]   at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44)
[lagom] [info]   at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:44)
[lagom] [info]   at sbt.std.Transform$$anon$4.work(System.scala:63)
[lagom] [info]   at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
[lagom] [info]   at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
[lagom] [info]   at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
[lagom] [info]   at sbt.Execute.work(Execute.scala:237)
[lagom] [info]   at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
[lagom] [info]   at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
[lagom] [info]   at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
[lagom] [info]   at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
[lagom] [info]   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[lagom] [info]   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[lagom] [info]   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[lagom] [info]   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[lagom] [info]   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[lagom] [info]   at java.lang.Thread.run(Thread.java:748)