Fix for ACT-1703

modules/activiti-json-converter/src/main/java/org/activiti/editor/language/json/converter/ServiceTaskJsonConverter.java

@@ -71,6 +71,10 @@ public class ServiceTaskJsonConverter extends BaseBpmnJsonConverter {
         propertiesNode.put(PROPERTY_SERVICETASK_DELEGATE_EXPRESSION, serviceTask.getImplementation());
       }
     	
+    	if (StringUtils.isNotEmpty(serviceTask.getResultVariableName())) {
+    	  propertiesNode.put(PROPERTY_SERVICETASK_RESULT_VARIABLE, serviceTask.getResultVariableName());
+    	}
+    	
     	addFieldExtensions(serviceTask.getFieldExtensions(), propertiesNode);
   	}
   }
@@ -90,6 +94,10 @@ public class ServiceTaskJsonConverter extends BaseBpmnJsonConverter {
       task.setImplementation(getPropertyValueAsString(PROPERTY_SERVICETASK_DELEGATE_EXPRESSION, elementNode));
     }
     
+    if (StringUtils.isNotEmpty(getPropertyValueAsString(PROPERTY_SERVICETASK_RESULT_VARIABLE, elementNode))) {
+      task.setResultVariableName(getPropertyValueAsString(PROPERTY_SERVICETASK_RESULT_VARIABLE, elementNode));
+    }
+    
     JsonNode fieldsNode = getProperty(PROPERTY_SERVICETASK_FIELDS, elementNode);
     if (fieldsNode != null) {
       JsonNode itemsArrayNode = fieldsNode.get(EDITOR_PROPERTIES_GENERAL_ITEMS);