add support for JDK 11

[kai-chi]

mvn package crashes on JDK 11 with error

Caused by: java.lang.NoClassDefFoundError: javax/tools/ToolProvider

full log:

[INFO] --------------------< io.hops:hops-examples-spark >---------------------
[INFO] Building hops-examples-spark 0.10.0-SNAPSHOT [2/4]
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ hops-examples-spark ---
[INFO] Deleting /home/kaichi/Projects/hops-examples/spark/target
[INFO]
[INFO] --- maven-checkstyle-plugin:2.16:check (validate) @ hops-examples-spark ---
[INFO] Starting audit...
Audit done.
[INFO]
[INFO] --- build-helper-maven-plugin:3.0.0:add-source (add-source) @ hops-examples-spark ---
[INFO] Source directory: /home/kaichi/Projects/hops-examples/spark/src/main/scala added.
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ hops-examples-spark ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/kaichi/Projects/hops-examples/spark/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ hops-examples-spark ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /home/kaichi/Projects/hops-examples/spark/target/classes
[WARNING] /home/kaichi/Projects/hops-examples/spark/src/main/java/io/hops/examples/spark/WorkflowExample.java: /home/kaichi/Projects/hops-examples/spark/src/main/java/io/hops/examples/spark/WorkflowExample.java uses or overrides a deprecated API.
[WARNING] /home/kaichi/Projects/hops-examples/spark/src/main/java/io/hops/examples/spark/WorkflowExample.java: Recompile with -Xlint:deprecation for details.
[INFO]
[INFO] --- scala-maven-plugin:3.2.2:compile (default) @ hops-examples-spark ---
Downloading from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-project-dist/2.8.2.8-SNAPSHOT/maven-metadata.xml
Downloaded from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-project-dist/2.8.2.8-SNAPSHOT/maven-metadata.xml (366 B at 1.2 kB/s)
Downloading from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-project/2.8.2.8-SNAPSHOT/maven-metadata.xml
Downloaded from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-project/2.8.2.8-SNAPSHOT/maven-metadata.xml (361 B at 3.1 kB/s)
Downloading from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-main/2.8.2.8-SNAPSHOT/maven-metadata.xml
Downloaded from hops-snapshot-repository: https://bbc1.sics.se/archiva/repository/Hops/io/hops/hadoop-main/2.8.2.8-SNAPSHOT/maven-metadata.xml (358 B at 3.1 kB/s)
[WARNING] Expected all dependencies to require Scala version: 2.11.12
[WARNING] org.apache.spark:spark-tags_2.11:2.4.0 requires scala version: 2.11.12
[WARNING] org.apache.spark:spark-streaming_2.11:2.4.0 requires scala version: 2.11.12
[WARNING] org.apache.kafka:kafka_2.11:1.1.0 requires scala version: 2.11.12
[WARNING] org.scala-lang:scala-reflect:2.11.12 requires scala version: 2.11.12
[WARNING] com.typesafe.scala-logging:scala-logging_2.11:3.7.2 requires scala version: 2.11.11
[WARNING] Multiple versions of scala libraries detected!
[INFO] /home/kaichi/Projects/hops-examples/spark/src/main/java:-1: info: compiling
[INFO] /home/kaichi/Projects/hops-examples/spark/src/main/scala:-1: info: compiling
[INFO] Compiling 2 source files to /home/kaichi/Projects/hops-examples/spark/target/classes at 1553523353016
[ERROR] error: java.lang.NoClassDefFoundError: javax/tools/ToolProvider
[INFO] at scala.reflect.io.JavaToolsPlatformArchive.iterator(ZipArchive.scala:301)
[INFO] at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
[INFO] at scala.reflect.io.AbstractFile.foreach(AbstractFile.scala:92)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.traverse(ClassPath.scala:277)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.x$15$lzycompute(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.x$15(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages$lzycompute(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages(ClassPath.scala:264)
[INFO] at scala.tools.nsc.util.MergedClassPath$$anonfun$packages$1.apply(ClassPath.scala:358)
[INFO] at scala.tools.nsc.util.MergedClassPath$$anonfun$packages$1.apply(ClassPath.scala:358)
[INFO] at scala.collection.Iterator$class.foreach(Iterator.scala:891)
[INFO] at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
[INFO] at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
[INFO] at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
[INFO] at scala.tools.nsc.util.MergedClassPath.packages$lzycompute(ClassPath.scala:358)
[INFO] at scala.tools.nsc.util.MergedClassPath.packages(ClassPath.scala:353)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply$mcV$sp(SymbolLoaders.scala:269)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply(SymbolLoaders.scala:260)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply(SymbolLoaders.scala:260)
[INFO] at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:235)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader.doComplete(SymbolLoaders.scala:260)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$SymbolLoader.complete(SymbolLoaders.scala:211)
[INFO] at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1535)
[INFO] at scala.reflect.internal.Mirrors$RootsBase.init(Mirrors.scala:256)
[INFO] at scala.tools.nsc.Global.rootMirror$lzycompute(Global.scala:73)
[INFO] at scala.tools.nsc.Global.rootMirror(Global.scala:71)
[INFO] at scala.tools.nsc.Global.rootMirror(Global.scala:39)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:257)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:257)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1390)
[INFO] at scala.tools.nsc.Global$Run.(Global.scala:1242)
[INFO] at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
[INFO] at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
[INFO] at scala.tools.nsc.Driver.process(Driver.scala:51)
[INFO] at scala.tools.nsc.Driver.main(Driver.scala:64)
[INFO] at scala.tools.nsc.Main.main(Main.scala)
[INFO] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[INFO] at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
[INFO] at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
[INFO] java.lang.reflect.InvocationTargetException
[INFO] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO] at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[INFO] at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)
[INFO] at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
[ERROR] Caused by: java.lang.NoClassDefFoundError: javax/tools/ToolProvider
[INFO] at scala.reflect.io.JavaToolsPlatformArchive.iterator(ZipArchive.scala:301)
[INFO] at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
[INFO] at scala.reflect.io.AbstractFile.foreach(AbstractFile.scala:92)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.traverse(ClassPath.scala:277)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.x$15$lzycompute(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.x$15(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages$lzycompute(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages(ClassPath.scala:299)
[INFO] at scala.tools.nsc.util.DirectoryClassPath.packages(ClassPath.scala:264)
[INFO] at scala.tools.nsc.util.MergedClassPath$$anonfun$packages$1.apply(ClassPath.scala:358)
[INFO] at scala.tools.nsc.util.MergedClassPath$$anonfun$packages$1.apply(ClassPath.scala:358)
[INFO] at scala.collection.Iterator$class.foreach(Iterator.scala:891)
[INFO] at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
[INFO] at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
[INFO] at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
[INFO] at scala.tools.nsc.util.MergedClassPath.packages$lzycompute(ClassPath.scala:358)
[INFO] at scala.tools.nsc.util.MergedClassPath.packages(ClassPath.scala:353)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply$mcV$sp(SymbolLoaders.scala:269)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply(SymbolLoaders.scala:260)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader$$anonfun$doComplete$1.apply(SymbolLoaders.scala:260)
[INFO] at scala.reflect.internal.SymbolTable.enteringPhase(SymbolTable.scala:235)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$PackageLoader.doComplete(SymbolLoaders.scala:260)
[INFO] at scala.tools.nsc.symtab.SymbolLoaders$SymbolLoader.complete(SymbolLoaders.scala:211)
[INFO] at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1535)
[INFO] at scala.reflect.internal.Mirrors$RootsBase.init(Mirrors.scala:256)
[INFO] at scala.tools.nsc.Global.rootMirror$lzycompute(Global.scala:73)
[INFO] at scala.tools.nsc.Global.rootMirror(Global.scala:71)
[INFO] at scala.tools.nsc.Global.rootMirror(Global.scala:39)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:257)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:257)
[INFO] at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1390)
[INFO] at scala.tools.nsc.Global$Run.(Global.scala:1242)
[INFO] at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
[INFO] at scala.tools.nsc.MainClass.doCompile(Main.scala:23)
[INFO] at scala.tools.nsc.Driver.process(Driver.scala:51)
[INFO] at scala.tools.nsc.Driver.main(Driver.scala:64)
[INFO] at scala.tools.nsc.Main.main(Main.scala)
[INFO] ... 6 more
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] hops-examples 0.10.0-SNAPSHOT ...................... SUCCESS [ 7.253 s]
[INFO] hops-examples-spark ................................ FAILURE [ 10.870 s]
[INFO] hops-examples-hive ................................. SKIPPED
[INFO] hops-examples-featurestore 0.10.0-SNAPSHOT ......... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 18.351 s
[INFO] Finished at: 2019-03-25T15:15:53+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.2:compile (default) on project hops-examples-spark: wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: 240 (Exit value: 240) -> [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
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn -rf :hops-examples-spark

[kai-chi]

it's a known bug that can be "solved" by adding

<configuration>
    <args>
        <arg>-nobootcp</arg>
    </args>
</configuration>

to the scala-maven-plugin in the hops-examples-spark module.
This works and leads to another compilation error in hops-examples-hive:

[ERROR] Failed to execute goal on project hops-examples-hive: Could not resolve dependencies for project io.hops:hops-examples-hive:jar:0.10.0-SNAPSHOT: Could not find artifact jdk.tools:jdk.tools:jar:1.7 at specified path /usr/lib/jvm/jdk-11.0.2/../lib/tools.jar -> [Help 1]

tools.jar was removed in JDK 9. It seems to me that the io.hops.hive.hive-jdbc dependency needs an upgrade to make it work but I can't find the its repo

[kai-chi]

If you point me to the right repos I can try to write a fix for that

[tkakantousis]

@SirOibaf