jbpm/jbpm-flow/src/main/java/org/jbpm/process/instance/LightProcessRuntime.java [263:290]:
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        public void signalEvent(final String type, Object event) {
            for (EventFilter filter : eventFilters) {
                if (!filter.acceptsEvent(type, event, varName -> null)) {
                    return;
                }
            }
            Map<String, Object> outputSet = new HashMap<>();
            for (Map.Entry<String, String> entry : trigger.getInMappings().entrySet()) {
                outputSet.put(entry.getKey(), entry.getKey());
            }
            // data association needs to be corrected as it is not input mapping but output mapping
            boolean eventFound = false;
            for (DataAssociation dataAssociation : trigger.getInAssociations()) {
                if ("event".equals(dataAssociation.getSources().get(0).getLabel())) {
                    eventFound = true;
                }
            }

            if (!eventFound && !trigger.getInAssociations().isEmpty()) {
                String inputLabel = (String) startNode.getMetaData(TRIGGER_MAPPING_INPUT);
                outputSet.put(inputLabel, event);
            } else {
                outputSet.put("event", event);
            }

            Map<String, Object> parameters = NodeIoHelper.processOutputs(trigger.getInAssociations(), key -> outputSet.get(key));
            startProcessWithParamsAndTrigger(processId, parameters, type);
        }
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jbpm/jbpm-flow/src/main/java/org/jbpm/process/instance/ProcessRuntimeImpl.java [412:441]:
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        public void signalEvent(final String type, Object event) {
            for (EventFilter filter : eventFilters) {
                if (!filter.acceptsEvent(type, event, varName -> null)) {
                    return;
                }
            }
            Map<String, Object> outputSet = new HashMap<>();
            for (Map.Entry<String, String> entry : trigger.getInMappings().entrySet()) {
                outputSet.put(entry.getKey(), entry.getKey());
            }

            // data association needs to be corrected as it is not input mapping but output mapping
            boolean eventFound = false;
            for (DataAssociation dataAssociation : trigger.getInAssociations()) {
                if ("event".equals(dataAssociation.getSources().get(0).getLabel())) {
                    eventFound = true;
                }
            }

            if (!eventFound && !trigger.getInAssociations().isEmpty()) {
                String inputLabel = (String) startNode.getMetaData(TRIGGER_MAPPING_INPUT);
                outputSet.put(inputLabel, event);
            } else {
                outputSet.put("event", event);
            }

            Map<String, Object> parameters = NodeIoHelper.processOutputs(trigger.getInAssociations(), key -> outputSet.get(key));
            startProcessWithParamsAndTrigger(processId, parameters, type);

        }
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