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Version: 8.5

Incidents

In Camunda 8, an incident represents a problem in process execution. This means a process instance is stuck at a particular point and requires user interaction to resolve the problem.

Incidents are created in different situations, including the following:

  • A job is failed and it has no retries left.
  • A condition doesn't return true or false.
  • A timer expression doesn't return the expected type.
  • A decision can't be evaluated.
note

Not all errors necessarily lead to incidents. For example, unexpected errors in Zeebe do not always result in incidents.

Resolving​

To resolve an incident, complete the following steps:

  1. Identify and resolve the problem.
  2. Mark the incident as resolved, triggering retry process execution.
  3. If the problem still exists, a new incident is created.

If a job fails and has no retries remaining, an incident is created. There are many different reasons why the job may have failed. For example, the variables may not be in the expected format, or a service is not available (e.g. a database).

If the variables are causing the incident, complete the following steps:

  1. Update the variables of the process instance.
  2. Increase the remaining retries of the job.
  3. Mark the incident as resolved.
note

It's recommended you complete these operations in Operate.

It is also possible to complete these steps via the client API. Using the Java client, this could look like the following:

client.newSetVariablesCommand(incident.getElementInstanceKey())
    .variables(NEW_PAYLOAD)
    .send()
    .join();

client.newUpdateRetriesCommand(incident.getJobKey())
    .retries(3)
    .send()
    .join();

client.newResolveIncidentCommand(incident.getKey())
    .send()
    .join();

When the incident is resolved, the job can be activated by a worker again.

If an incident is created during process execution and it's not related to a job, the incident is usually related to the variables of the process instance. For example, a condition expression doesn't return a boolean value.

To resolve the incident, update the variables and mark the incident as resolved.

note

It's recommended you complete these operations in Operate.

Using the Java client, this could look like the following:

client.newSetVariablesCommand(incident.getElementInstanceKey())
    .variables(NEW_VARIABLES)
    .send()
    .join();

client.newResolveIncidentCommand(incident.getKey())
    .send()
    .join();

When the incident is resolved, the process instance continues.