Shortly after my prior post I observed in the documentation for RunGraph that you cannot run a graph with a subgraph when using a separate JVM. This would explain my issue.
However, when removing the subgraph, I got some more errors:
Secure parameters are supported only in CloverDX Server environment
This appears to be caused by using a secure parameter in the graph being executed. Is this also unsupported? For testing purposes, I removed the secure parameter and then tried to execute again, but got the following error
Cannot find class: jk.StreamFile
The StreamFile class is used by a CustomJavaTransformer component within the graph. Is this also unsupported?