[GROOVY-5716] @Immutable annotation should allow Cloneable fields

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.8.8, 2.0.2
• Fix Version/s: 2.0.5, 2.1.0-beta-1, 1.8.9
• Component/s: Static compilation
• Environment: JDK 1.6, Linux, Groovy 1.8.8 and 2.0.2
• Assignee: Paul King
• Reporter: David Clark
• Created: 20/Sep/12 09:58
• Updated: 04/Oct/12 17:02
• Resolved: 21/Sep/12 17:03

Description

Classes like the following:

@Immutable public class Cell {
Cloneable data;
Cell next;
}

fail to compile with this error message:

@Immutable processor doesn't know how to handle field 'data' of type 'java.lang.Cloneable' while compiling class Cell.
@Immutable classes only support properties with effectively immutable types including:

• Strings, primitive types, wrapper types, BigInteger and BigDecimal, enums
• other @Immutable classes and known immutables (java.awt.Color, java.net.URI)
• Cloneable classes, collections, maps and arrays, and other classes with special handling (java.util.Date)
  Other restrictions apply, please see the groovydoc for @Immutable for further details

The implementation should be able to guarantee immutability for the Cloneable member by using the clone() method appropriately.