I am using Java 1.8.0 and Scala 2.11.8 on Mac OS 10.14.6
$ java -version
openjdk version "1.8.0_192"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_192-b12)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.192-b12, mixed mode)
15:42 $ scala -version
Scala code runner version 2.11.8 -- Copyright 2002-2016, LAMP/EPFL
15:42 $ mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ----------< dataproc-spark-demos:spark-streaming-pubsub-demo >----------
[INFO] Building spark-streaming-pubsub-demo 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ spark-streaming-pubsub-demo ---
[INFO] Deleting /Users/01087872/Documents/dataproc-pubsub-spark-streaming/spark/target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ spark-streaming-pubsub-demo ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/01087872/Documents/dataproc-pubsub-spark-streaming/spark/src/main/resources
[INFO]
[INFO] --- scala-maven-plugin:3.3.2:compile (default) @ spark-streaming-pubsub-demo ---
[WARNING] Expected all dependencies to require Scala version: 2.11.8
[WARNING] com.twitter:chill_2.11:0.8.0 requires scala version: 2.11.7
[WARNING] Multiple versions of scala libraries detected!
[INFO] /Users/01087872/Documents/dataproc-pubsub-spark-streaming/spark/src/main/scala:-1: info: compiling
[INFO] Compiling 3 source files to /Users/01087872/Documents/dataproc-pubsub-spark-streaming/spark/target/classes at 1566718969568
[ERROR] error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
[ERROR] at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:17)
[ERROR] at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:18)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:53)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:66)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getClassByName(Mirrors.scala:102)
[ERROR] at scala.reflect.internal.Mirrors$RootsBase.getRequiredClass(Mirrors.scala:105)
[ERROR] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:257)
[ERROR] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:257)
[ERROR] at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1394)
[ERROR] at scala.tools.nsc.Global$Run.<init>(Global.scala:1215)
[ERROR] at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
[ERROR] at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
[ERROR] at scala.tools.nsc.Driver.process(Driver.scala:51)
[ERROR] at scala.tools.nsc.Driver.main(Driver.scala:64)
[ERROR] at scala.tools.nsc.Main.main(Main.scala)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR] at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
[ERROR] at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.705 s
[INFO] Finished at: 2019-08-25T15:42:50+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.3.2:compile (default) on project spark-streaming-pubsub-demo: wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
mvn clean package
failes on my environment.