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Temporal applications communicate with the orchestrator - the Temporal Cluster.
The Worker process (running workflow) and the client process (invoking workflows) may be different processes running on different machines.
While invoking workflows & activities may look like simple method invocation, it's a remote procedure call over the network.
Therefore, ZIO-Temporal (if more precisely, the Java SDK) serializes workflow & activity method parameters before sending them over network.

ZIO-Temporal provides two default ways to serialize data:

  • As JSON objects using Jackson library
  • In Protobuf binary format using Scalapb library