Scala Mixed Java Scala project problem

I followed this: http://davidb.github.io/scala-maven-plugin/example_java.html and created a sample project: https://github.com/danyaljj/sampleMixedScalaJavaMavenProject I keep getting the following error. Where am I going wrong?

AI2s-MBP-7:mixedScalaJavaProject i-danielk$ mvn compile
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Test for Java + Scala compilation 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ testJavaAndScala ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/i-danielk/ideaProjects/mixedScalaJavaProject/src/main/resources
[INFO] 
[INFO] --- scala-maven-plugin:3.2.1:add-source (scala-compile-first) @ testJavaAndScala ---
[INFO] Add Source directory: /Users/i-danielk/ideaProjects/mixedScalaJavaProject/src/main/scala
[INFO] Add Test Source directory: /Users/i-danielk/ideaProjects/mixedScalaJavaProject/src/test/scala
[INFO] 
[INFO] --- scala-maven-plugin:3.2.1:compile (scala-compile-first) @ testJavaAndScala ---
[INFO] /Users/i-danielk/ideaProjects/mixedScalaJavaProject/src/main/java:-1: info: compiling
[INFO] /Users/i-danielk/ideaProjects/mixedScalaJavaProject/src/main/scala:-1: info: compiling
[INFO] Compiling 2 source files to /Users/i-danielk/ideaProjects/mixedScalaJavaProject/target/classes at 1440462398489
[ERROR] error: error while loading Consumer, class file '/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/rt.jar(java/util/function/Consumer.class)' is broken
[INFO] (bad constant pool tag 18 at byte 15)
[ERROR] one error found
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.366 s
[INFO] Finished at: 2015-08-24T19:26:39-05:00
[INFO] Final Memory: 11M/309M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.2.1:compile (scala-compile-first) on project testJavaAndScala: 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
AI2s-MBP-7:mixedScalaJavaProject i-danielk$ 

[danyaljj]

Whoops … I got it to work after I msged here, but forgot to close this. Closing now …

[Jacktavitt]

I checked to make sure the Scala and Spark versions in mine were correct. When I changed the Spark version to the correct one, the problem was resolved.