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  1. Groovy
  2. GROOVY-9603

Assignment of Map literal to Map element fails to compile (static)

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      Description

      Declare a Map<String,Object>. When trying to put a map literal into that map, assignments in property style (map.key = ...) and subscript style (map[key] = ...) fail with

      [Static type checking] - No such property: ... for class: java.lang.Object

      First assigning to a local variable gives no such problems. If the Map were to contain objects of a specific type, coercion from map to that particular type would make sense. This coercion from Map to Object makes to sense. A Map is an Object and should simply become the new value for that particular key, which is just what is happening with regular compilation.

      Same for Map<String,?> and Map<String,? extends Object

      @groovy.transform.CompileStatic
      def updateMap(Map<String,Object> map) {
          def innerMap = [ foo: "bar", bar: "foo" ]
          // No problem on this assignment
          map.someProp = innerMap
          assert map.someProp["foo"] == "bar"
          // The next three lines should all be equivalent
          // but the 2nd and 3rd don't CompileStatic
          map.put("someProp", [ abc: "efg" ])
          map["someProp"] = [ abc: "hij" ]
          map.someProp = [ abc: "klm" ]
          assert map.someProp["abc"] == "klm"
      }
      

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            • Assignee:
              emilles Eric Milles
              Reporter:
              eddelplus Jochen Eddelbuettel
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