flowable/flowable-engine · error · FlowableException

Cannot complete process instance. Parent process instance

Error message

Cannot complete process instance. Parent process instance ${executionEntity} is suspended

What it means

When the sub process instance started by a call activity finishes, CallActivityBehavior.completed resumes the parent execution — but only if the parent process instance and its process definition are not suspended. If either is suspended, control flow cannot continue and this FlowableException is thrown.

Solutions

Reactivate the parent: managementService.activateProcessDefinitionById(parentDefinitionId, true, null) so suspended parent instances resume.
Reactivate the specific suspended execution: managementService.activateProcessInstanceById(parentInstanceId).
Avoid suspending definitions with live call-activity children; drain sub instances before suspending or use activateProcessInstances=true consistently.
Monitor for stuck child instances before ending a maintenance window.

Example fix

// before: parent definition suspended while child still running
managementService.suspendProcessDefinitionById("parent:1:1", false, null);
// after: keep instances activatable or reactivate before children complete
managementService.activateProcessDefinitionById("parent:1:1", true, null);

Defensive patterns

Strategy: try-catch

Validate before calling

if (managementService.createProcessInstanceQuery().processInstanceId(parentId).singleResult().isSuspended()) {
    managementService.activateProcessInstanceById(parentId);
}

Try / catch

try { caseOrSubComplete(); }
catch (FlowableException e) { if (e.getMessage().contains("Parent process instance") && e.getMessage().contains("suspended")) { activateParentThenRetry(); } else { throw e; } }

Prevention

Suspend definitions with activateProcessInstances=true so live parents can still finish.
Drain running call-activity children before suspending.
Alert on suspended instances with active children.
Schedule suspensions outside expected child completion times.

When it happens

Trigger: A sub process instance completes while its parent execution (executionEntity.isSuspended()) or the parent's process definition (ProcessDefinitionUtil.isProcessDefinitionSuspended) is in suspended state.

Common situations: Administrator suspended the parent process definition (suspendProcessDefinitionById without activateProcessInstances) while child sub instances were still running; those children finish during the suspension window and try to return control.

Understand the failure class

Background: "Invalid state transition" errors: "status must be X, actually Y", "already rejected/charging/uninstalled", "cannot ... while running" — what they mean when a library rejects your call — this error's family across 31 libraries.

Related errors

AI-assisted analysis of flowable/flowable-engine@d6d39ce1c6 (2026-09-11). Data as JSON: /api/errors/8c2550d0ab6edef7. Report an issue: GitHub.

Appendix: source

Thrown at modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CallActivityBehavior.java:281

            BiConsumer<String, Object> variableConsumer = (variableName, value) -> {
                if (callActivity.isUseLocalScopeForOutParameters()) {
                    executionEntity.setVariableLocal(variableName, value);
                } else {
                    executionEntity.setVariable(variableName, value);
                }
            };

            IOParameterUtil.processOutParameters(outParameters, subProcessInstance, variableConsumer, variableConsumer, expressionManager);
        }
    }

    @Override
    public void completed(DelegateExecution execution) throws Exception {
        // only control flow. no sub process instance data available

        ExecutionEntity executionEntity = (ExecutionEntity) execution;
        if (executionEntity.isSuspended() || ProcessDefinitionUtil.isProcessDefinitionSuspended(execution.getProcessDefinitionId())) {
            throw new FlowableException("Cannot complete process instance. Parent process instance " + executionEntity + " is suspended");
        }

        leave(execution);
    }

    protected ProcessDefinition getProcessDefinitionById(DelegateExecution execution, ProcessEngineConfigurationImpl processEngineConfiguration) {
        return CommandContextUtil.getProcessEngineConfiguration().getDeploymentManager()
            .findDeployedProcessDefinitionById(getCalledElementValue(execution, processEngineConfiguration));
    }

    protected ProcessDefinition getProcessDefinitionByKey(DelegateExecution execution, boolean isSameDeployment, ProcessEngineConfigurationImpl processEngineConfiguration) {
        String processDefinitionKey = getCalledElementValue(execution, processEngineConfiguration);
        String tenantId = execution.getTenantId();

        ProcessDefinitionEntityManager processDefinitionEntityManager = Context.getProcessEngineConfiguration().getProcessDefinitionEntityManager();
        ProcessDefinitionEntity processDefinition;

        if (isSameDeployment) {

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