[jira] [Created] (GROOVY-8839) Static compilation and array type parameter causing compile error

["Eric Milles (JIRA)" <ji...@apache.org>]

Eric Milles created GROOVY-8839:
-----------------------------------

             Summary: Static compilation and array type parameter causing compile error
                 Key: GROOVY-8839
                 URL: https://issues.apache.org/jira/browse/GROOVY-8839
             Project: Groovy
          Issue Type: Question
    Affects Versions: 2.4.15
            Reporter: Eric Milles


This seems related to GROOVY-8342 (and possibly GROOVY-8638 and GROOVY-7985).  When using an array in a generics parameter, I get compile errors for return of a map and also for assignment of return value to a variable.

{code:java}
package r;
public class ResultHandle {}
{code}

{code:groovy}
package p
import groovy.transform.CompileStatic
import r.ResultHandle
@CompileStatic
class Issue {
  protected Map<String, ResultHandle[]> getResultsByType() {
    Map<String, ResultHandle[]> resultsByType = [:]
    // populate resultsByType
    return resultsByType
  }
}
{code}

When I build using Ant, I get the following error:
{code}
Buildfile: ...\Gr8\build.xml
-init:
-compile:
    [mkdir] Created dir: ...\Gr8\ant\JavaClasses
  [compile] Compiling 2 source files to ...\Gr8\ant\JavaClasses
  [compile] org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
  [compile] ...\Gr8\src\main\bugs\Groovy1234.groovy: 12: [Static type checking] - Incompatible generic argument types. Cannot assign java.util.LinkedHashMap <java.lang.String, [Lr.ResultHandle;> to: java.util.Map <String, ResultHandle[]>
  [compile]  @ line 12, column 12.
  [compile]        return resultsByType
  [compile]               ^
  [compile] 1 error

BUILD FAILED
{code}

Additionally, I would get an error if I assigned the result of the method to a typed variable, like this: {{Map<String, ResultHandle[]> resultsByType = issue.getResultsByType()}}



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