flowable/flowable-engine · warning

Following warnings encountered during process validation

Error message

Following warnings encountered during process validation: {}

What it means

After parsing a BPMN model, BpmnParse logs any accumulated validation warnings (e.g. unknown attributes or elements that were tolerated during parse). It is a non-fatal notice logged from execute() when warningBuilder is non-empty; parsing continues and the deployment succeeds.

Solutions

1. Read the warning body following this log line to see the specific warnings and fix the offending BPMN elements
2. Validate the BPMN XML against the Flowable XSD before deployment
3. Regenerate or correct the diagram/elements flagged in the modeler
4. If the warnings are benign for your use case, they can be safely ignored since deployment still proceeds

Example fix

// before
<process id="p1"><serviceTask id="t1" flowable:unknownAttr="x"/></process>
// after
<process id="p1"><serviceTask id="t1" flowable:delegateExpression="${bean}"/></process>

// Validate BPMN before deployment
BpmnXMLConverter converter = new BpmnXMLConverter();
ValidationResults results = converter.validateXml(inputStream, false);
if (!results.getWarnings().isEmpty()) {
    results.getWarnings().forEach(w -> logger.warn("BPMN warning: {}", w.toString()));
    // fix model or proceed knowingly
}

When it happens

Trigger: Deploying or parsing a BPMN XML file whose model contains tolerated validation warnings collected during BpmnParse execution; occurs at the end of BpmnParse.execute() when warningBuilder.length() > 0.

Common situations: Deploying process definitions exported from modeling tools with vendor-specific or slightly non-standard BPMN; upgrading Flowable/Activiti where new validation checks flag previously ignored constructs.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• Activity needed for multi instance cannot bv found
• ' ' is not valid boolean in mapException with errorCode=…
• end event with cancelEventDefinition only supported inside…
• Error code must not be empty.
• Error Code must not be empty.

AI-assisted analysis of flowable/flowable-engine@d6d39ce1c6 (2026-09-11). Data as JSON: /api/errors/bb8cbc0082839054. Report an issue: GitHub.

Appendix: source

Thrown at modules/flowable5-engine/src/main/java/org/activiti/engine/impl/bpmn/parser/BpmnParse.java:197

                        for (ValidationError error : validationErrors) {
                            if (error.isWarning()) {
                                warningBuilder.append(error);
                                warningBuilder.append("\n");
                            } else {
                                errorBuilder.append(error);
                                errorBuilder.append("\n");
                            }
                        }

                        // Throw exception if there is any error
                        if (errorBuilder.length() > 0) {
                            throw new ActivitiException("Errors while parsing:\n" + errorBuilder);
                        }

                        // Write out warnings (if any)
                        if (warningBuilder.length() > 0) {
                            LOGGER.warn("Following warnings encountered during process validation: {}", warningBuilder);
                        }

                    }
                }
            }

            bpmnModel.setSourceSystemId(sourceSystemId);
            bpmnModel.setEventSupport(new FlowableEventSupport());

            // Validation successful (or no validation)
            transformProcessDefinitions();

        } catch (Exception e) {
            if (e instanceof ActivitiException) {
                throw (ActivitiException) e;
            } else if (e instanceof XMLException) {
                throw (XMLException) e;
            } else {

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