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https://issues.apache.org/jira/browse/GROOVY-7363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pascal Schumacher resolved GROOVY-7363.
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Resolution: Fixed
Assignee: Pascal Schumacher (was: Cédric Champeau)
Fix Version/s: 2.4.6
Pull request merged. Thanks!
> Frequent compilation error on cascading generic types
> -----------------------------------------------------
>
> Key: GROOVY-7363
> URL: https://issues.apache.org/jira/browse/GROOVY-7363
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 2.4.2
> Environment: MacOS X
> Oracle JDK 1.7u75 / 1.8u40
> Maven 3.0.5
> Reporter: Frank Pavageau
> Assignee: Pascal Schumacher
> Labels: test
> Fix For: 2.4.6
>
> Attachments: lost-cascading-types.tar.gz
>
>
> Most of the time, I get the following compilation error:
> {noformat}
> [ERROR]
> /Users/fpavageau/devs/bugs/lost-cascading-types/src/main/groovy/BadType.groovy:
> 22: [Static type checking] - No such property: start for class: T
> [ERROR] @ line 22, column 22.
> [ERROR] println("" + rel.currentState.state.start)
> [ERROR] ^
> [ERROR]
> [ERROR] 1 error
> {noformat}
> where {{rel}} is an instance of a non-parameterized (Java) class implementing
> a generic interface with the {{currentState}} generic property. So the type
> of the property should actually be known, but it's lost and I get a
> compilation error because the {{start}} property is not part of the
> lower-bound type of {{currentState}}.
> When I say "most of the time", it's because the compilation error is not
> always triggered (so lots of debugging fun!). I've tried with Oracle JDK
> 1.7u75 and 1.8u40, and I get around 87% of failures:
> {code:title=JDK 1.7}
> $ failures=0; for i in {1..100}; do mvn clean package > /dev/null 2>&1 ||
> ((failures++)); done; echo $failures
> 87
> {code}
> {code:title=JDK 1.8}
> $ failures=0; for i in {1..100}; do mvn clean package > /dev/null 2>&1 ||
> ((failures++)); done; echo $failures
> 88
> {code}
> I'm attaching a test case, which is also available on
> [Github|https://github.com/fpavageau/lost-cascading-types].
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