[GROOVY-5386] @Delegate - sometimes compilation fails for generic types

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0-beta-2, 1.8.6
• Fix Version/s: 2.0.5
• Component/s: Compiler
• Environment: JVM: 1.6.0_29 Vendor: Apple Inc. OS: Mac OS X
• Assignee: Jochen Theodorou
• Reporter: Andre Steingress
• Created: 29/Mar/12 05:55
• Updated: 28/May/14 03:04
• Resolved: 22/May/14 06:29

Description

we have some classes using @Delegate on generic classes:

@Commons
class FilterList {

@Delegate List<Map<Dimension, List<String>>> filterList = []

...
}

Sometime compilation fails with compiler errors like

BUG! exception in phase 'class generation' in source unit '/Users/andre/Development/Projects/Adternity/grf/grails-app/jobs/com/grf/reports/ScheduledReportExecutionJob.groovy' Type is null. Most probably you let a transform reuse existing ClassNodes with generics information, that is now used in a wrong context. (Use --stacktrace to see the full trace)

I assume this has to do with DelegateASTTransformation#nonGeneric handling of generic types, which is setting the generic type to null, but it's hard to reproduce the error in a determined way.