= Java EE Annotations

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While Apache Causeway does define many of its own annotations, the policy is to reuse standard Java/JEE annotations wherever they exist or are added to the Java platform.

The table below lists the JEE annotations currently recognized.


.Java EE Annotations
[cols="2,4a,1", options="header"]
|===
|Annotation
|Purpose
|Layer

|xref:refguide:applib-ant:Digits.adoc[`@javax.validation.` +
`constraints.` +
`Digits`]
|Precision/scale for BigDecimal values.
|Domain

|xref:refguide:applib-ant:Pattern.adoc[`@javax.validation.` +
`constraints.` +
`Pattern`]
|Regular expressions for strings
|Domain


|xref:refguide:applib-ant:Digits.adoc[`@javax.annotation.` +
`Nullable`]
|Specify that a property/parameter is optional.
|Domain


|===



