timbonicus opened a new issue, #14630:
URL: https://github.com/apache/grails-core/issues/14630
Converting a Grails 2 project to Grails 3, we ran into an issue with some
wrapper classes that use the @Delegate Groovy annotation with a GORM domain
object:
```
Can't have an abstract method in a non-abstract class. The class
'test.delegate.annotation.TestWrapper' must be declared abstract or the method
'boolean org_grails_datastore_gorm_GormValidateable__skipValidate$get()' must
be implemented.
@ line 3, column 1.
```
I worked around it by having the wrapper implement GormValidateable,
DirtyCheckable, and Validateable. I'm not sure if this is the best solution. I
found [GROOVY-7288](https://issues.apache.org/jira/browse/GROOVY-7288) that
looks like the same issue. Maybe it's a Groovy bug?
Here's a test project that reproduces the issue:
[test-delegate-annotation.zip](https://github.com/grails/grails-data-mapping/files/725334/test-delegate-annotation.zip)
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