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https://issues.apache.org/jira/browse/GROOVY-9244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16927894#comment-16927894
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Eric Milles edited comment on GROOVY-9244 at 9/11/19 6:41 PM:
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Since dynamic (default) Groovy supports multi-methods, it cannot tell which
superclass constructor to call with the argument "null". If you add
{{@CompileStatic}} to Groovy4, the choice will be made at compile time. The
same can be done to the enclosing method or class of the anon. inner class
construction.
was (Author: emilles):
Since dynamic (default) Groovy supports multi-methods, it cannot tell which
superclass constructor to call with the argument "null". If you add
`@CompileStatic` to Groovy4, the choice will be made at compile time. The same
can be done to the enclosing method or class of the anon. inner class
construction.
> Anonymous subclasses should cast their super-parameters
> -------------------------------------------------------
>
> Key: GROOVY-9244
> URL: https://issues.apache.org/jira/browse/GROOVY-9244
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7, 2.5.7
> Environment: I tried in GroovyConsole 2.4.7 and Groovy web console
> 2.5.7
> Reporter: Björn Kautler
> Priority: Major
>
> Given this code:
> {noformat}
> import java.util.regex.Pattern
> abstract class Groovy3 {
> Groovy3(String s) { println "String" }
> Groovy3(Pattern p) { println "Pattern" }
> }
> class Groovy4 extends Groovy3 {
> Groovy4(String s) { super(s) }
> Groovy4(Pattern p) { super(p) }
> }
> class Groovy5 extends Groovy3 {
> Groovy5(String s) { super(s as String) }
> Groovy5(Pattern p) { super(p as Pattern) }
> }
> class Groovy6 {
> Groovy6(String s) { println "String" }
> Groovy6(Pattern p) { println "Pattern" }
> }
> new Groovy3(null as String) { }
> new Groovy4(null as String)
> new Groovy5(null as String)
> new Groovy6(null as String)
> {noformat}
> Groovy3ish anc Groovy4 instantiation fail
> Groovy5 and Groovy6 instantiation succeed and print {{String}}.
> I did not found a way to make the Groovy3ish one work, except for doing it
> the Groovy4 way, but no chance with an anonymous subclass.
> From what I observed, I guess the anonymous subclass does it like Groovy4 but
> should do it like Groovy5 to properly select the super constructor.
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