> For the complete documentation index, see [llms.txt](https://docs.valtimo.nl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.valtimo.nl/valtimo-docs-v3/features/process/process/whitelist-scripting-classes.md).

# Whitelisting scripting classes for Operaton

It is possible to use classes in your script tasks by using the script engine. Valtimo restricts the classes that can be used to the following by default:

```kotlin
"java.util.ArrayList"
"org.joda.time.DateTime"
"java.util.Date"
"java.lang.Math"
"org.operaton.spin.Spin"
"java.time.Clock"
"java.time.Duration"
"java.time.Instant"
"java.time.LocalDate"
"java.time.LocalDateTime"
"java.time.LocalTime"
"java.time.MonthDay"
"java.time.OffsetDateTime"
"java.time.OffsetTime"
"java.time.Period"
"java.time.Year"
"java.time.YearMonth"
"java.time.ZonedDateTime"
"java.time.ZoneId"
"java.time.ZoneOffset"
```

Note: more classes can be whitelisted by using the following Spring property:

#### **`application.yml`**

```yaml
valtimo:
  operaton:
    scripting:
      allowedClasses: java.util.UUID, java.net.URI
```