private String toIndentedString(java.lang.Object o) {
        if (o == null) {
            return "null";
        }
        return o.toString().replace("\n", "\n    ");
    }
Convert the given object to string with each line indented by 4 spaces
(except the first line).
modules/siddhi-service/src/gen/java/io/siddhi/service/model/Error.java