Exception while Upserting Search Attributes

Community Support
1

While invoking the below method,

Workflow.upsertSearchAttributes

we are getting the below exception sometimes.

java.lang.IllegalStateException: Operation allowed only while eventLoop is running at io.temporal.internal.statemachines

Questions

  1. What causes this error?
  2. Why is it happening only sometimes?
2

This can be caused by for example calling Workflow.upsertSearchAttributes outside of workflow code or from
a query handler, reuse of workflow / child workflow stubs across multiple executions (for example issues with dependency injection),
or can follow PotentialDeadllockException, for example if you have some non-deterministic code that fails the workflow task right before the call to upsertSearchAttributes.
It could also happen during debugging if you do not set TEMPORAL_DEBUG to true while debugging.