Sparkling water droplet project running issue - scala

Question

I cloned sparkling droplet project from 'https://github.com/h2oai/h2o-droplets/tree/master/sparkling-water-droplet'. And cleaned and build project using ./gradlew clean , ./gradlew build respectively. After that tried to run project using command
spark-submit --class water.droplets.SparklingWaterDroplet build/libs/sparkling-water-droplet-app.jar
Then got following error message:
Exception in thread "main" java.lang.NoClassDefFoundError: water/fvec/Frame
at water.droplets.SparklingWaterDroplet.main(SparklingWaterDroplet.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:674)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: water.fvec.Frame
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 10 more

Answer 1

You have to run ./gradlew shadowJar and use the jar created by it build/libs/sparkling-water-droplet-app.jar instead since it creates a fat jar which contains all classes required while submitting a job (the build task does not do that).