Somehow elasticsearch-spark_2.10 depends on 2.11 version of scala-library

[nfx]

Strange things happen:

java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
at org.apache.spark.util.TimeStampedWeakValueHashMap.(TimeStampedWeakValueHashMap.scala:42)
at org.apache.spark.SparkContext.(SparkContext.scala:287)
at org.apache.spark.api.java.JavaSparkContext.(JavaSparkContext.scala:61)
at ....SparkJunitRule$SparkContextWrapper.start(SparkJunitRule.java:...)

mvn dependency:tree shows:
[INFO] +- org.elasticsearch:elasticsearch-spark_2.10:jar:2.2.0-m1:compile
[INFO] | - org.scala-lang:scala-library:jar:2.11.7:compile

but generated pom has:

<dependency>
  <groupId>org.scala-lang</groupId>
  <artifactId>scala-library</artifactId>
  <version>2.10.4</version>
  <scope>compile</scope>
</dependency>

what could be wrong and where?

[nfx]

Found out that transitive dependency was getting scala-library:2.11

[costin]

Make sure to use 2.2.0-rc1 or even better, the dev build. It contains a lot of fixes.

[nfx]

@costin is it safe to rely on dev build for production? ;)

[costin]

@nfx What version are you using? The Scala 2.11 artifacts should have the right Scala dependency (see for example version 2.2 here ).