I'm guessing this is due to changing the default CDAP spark version to spark2. Don't think the spark parts of wikipedia app work with spark2.
The build failure does indeed correlate with when PR was merged for CDAP spark version defaulting to spark2.
I tried running the WorkflowTest against a CDAP sandbox, and I didn't get the same error. However, the integration test case did not pass for a different reason (workflow token values).
Because the `NoSuchMethodError` does not happen on sandbox, deeming this as lower priority, and out of the 5.0 release.
Resolved by making the example application be Spark2-compatible.