Chenzhao Guo created SPARK-23667:
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             Summary: Scala version check will fail due to launcher directory 
doesn't exist
                 Key: SPARK-23667
                 URL: https://issues.apache.org/jira/browse/SPARK-23667
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.3.0
            Reporter: Chenzhao Guo


In some cases when outer project use pre-built Spark as dependency, 
{{getScalaVersion}} will fail due to {{launcher}} directory doesn't exist. This 
PR also checks in {{jars}} directory.



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