[jira] [Assigned] (GROOVY-11621) Assigning null to a List or Map using bracket notation does not work with @CompileStatic

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

     [ https://issues.apache.org/jira/browse/GROOVY-11621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles reassigned GROOVY-11621:
------------------------------------

    Assignee: Eric Milles

> Assigning null to a List or Map using bracket notation does not work with @CompileStatic
> ----------------------------------------------------------------------------------------
>
>                 Key: GROOVY-11621
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11621
>             Project: Groovy
>          Issue Type: Improvement
>          Components: Compiler
>    Affects Versions: 4.0.26
>            Reporter: Per Nyfelt
>            Assignee: Eric Milles
>            Priority: Minor
>
> I was recently experimenting with @CompileStatic for performance improvements and noticed that when using the short notation of putAt to assign a null value I get the following compilation error
> [Static type checking] - Cannot call <T> org.codehaus.groovy.runtime.DefaultGroovyMethods#putAt(java.util.List<T>, int, T) with arguments [java.util.List<java.lang.String>, int, java.lang.Object]
>  
> Here is an example:
>  
> import groovy.transform.CompileStatic
> import org.junit.jupiter.api.Test
> @CompileStatic
> class PutAtTest {
>   @Test
>   void testList() {
>     // These all work
>     def list = ['a', 'b', 'c']
>     list[0] = 'aa'
>     assert list[0] == 'aa'
>     list.set(2, null)
>     assert list[2] == null
>     list.putAt(0, null)
>     assert list[0] == null
>     // This Fails
>     list[1] = null
>     assert list[1] == null : "Short notation not working when assigning null"
>   }
>   @Test
>   void testMap() {
>     // These all work
>     def map = [a: 'foo', b: 'bar', c: 'baz', d: 'qui']
>     map['a'] = 'aa'
>     assert map['a'] == 'aa'
>     map.put('c', null)
>     assert map['c'] == null
>     map.putAt('a', null)
>     assert map['a'] == null
>     map.d = null
>     assert map['d'] == null
>     // This Fails
>     map['b'] = null
>     assert map['b'] == null  : "Short notation not working when assigning null"
>   }
> }
> As pointed out by [~paulk] on the users list, a workaround is to cast e.g.
> list[1] = (String)null
> map['b'] = (String)null
> But it would be groovier if assigning null using short bracket notation "just worked". Also note that property notation for maps works (map.d = null) but fails with brackets (map['d'] = null) which is surprising from a user perspective as they are seen as alternative but equivalent ways to do the same thing. 



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