[GROOVY-11057] STC Generic type matching failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.12
• Fix Version/s: 4.0.13
• Component/s: Compiler
• Assignee: Eric Milles
• Reporter: Jan Hackel
• Created: 15/May/23 06:18
• Updated: 12/Jan/24 16:32
• Resolved: 18/May/23 15:58

Description

With Groovy version 4.0.12 this code will no longer compile:

 

import groovy.transform.CompileStatic
import org.junit.jupiter.api.Test
import org.mockito.Mockito

@CompileStatic
interface Configuration {
  Map<String, Object> getSettings()
}

@CompileStatic
class GenericMapStubbing {

  @Test
  void stubSettings() {
    def configuration = Mockito.mock(Configuration).tap {
      Mockito.when(it.getSettings()).thenReturn([:])
    }

    assert configuration.settings.isEmpty()
  }
} 

Failure message:

 

18: [Static type checking] - Cannot find matching method org.mockito.stubbing.OngoingStubbing#thenReturn(java.util.LinkedHashMap<#K, #V>). Please check if the declared type is correct and if the method exists.
 @ line 16, column 7.
         Mockito.when(it.getSettings()).thenReturn([:])

Issue Links

• is caused by: GROOVY-11028 STC: empty map (or list) literal does not type check like emptyMap()
• relates to: GROOVY-11276 Generics error in method resolution