If you run multiple Apache Spark JAR jobs concurrently, some of the runs might fail with the error:
org.apache.spark.sql.AnalysisException: Table or view not found: xxxxxxx; line 1 pos 48
This error occurs due to a bug in Scala. When an object extends
val fields are no longer immutable and they can be changed when the
main method is called. If you run JAR jobs multiple times, a
val field containing a DataFrame can be changed inadvertently.
As a result, when any one of the concurrent runs finishes, it wipes out the temporary views of the other runs. Scala issue 11576 provides more detail.