Congratulations, your short test ran. Ignore the findDerbyClient errors.
Is your appserver still set to 32 GB or memory? If so, set appserver to have 2 VCPUs and 8 GB memory, set NUM_WORKOADS=1, and rerun to make sure appserver is still good. If that's good, then set NUM_WORKLOADS=4 and run a short test.