[jira] [Commented] (GROOVY-7861) asType(null) called in @CompileStatic method returns a string 'null'

["Shil Sinha (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-7861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328607#comment-15328607 ] 

Shil Sinha commented on GROOVY-7861:
------------------------------------

I tested this on 2.0.0, 2.1.0, and 2.4.0; it seems to always have been an issue. The difference in behavior between {{o.asType(String)}} and {{o as String}} (which returns the expected null) when o is null is due to the latter form taking the ScriptBytecodeAdapter#asType path, which sets null variables to a NullObject before proceeding.

> asType(null) called in @CompileStatic method returns a string 'null'
> --------------------------------------------------------------------
>
>                 Key: GROOVY-7861
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7861
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static compilation
>    Affects Versions: 2.4.7
>         Environment: Win, jdk1.7.79
>            Reporter: Jacek Karas
>            Priority: Minor
>
> The following code:
> {code}
> import groovy.transform.CompileStatic
> class Test {
>     @CompileStatic
>     static Object castToType(Object o, Class clazz) { 
>         return o.asType(clazz)
>     }
> }
> def foo = Test.castToType(null, String.class)
> println "'${foo}' class: ${foo.getClass()} bytes: ${foo?.getBytes()}"
> {code}
> prints:
> {panel}
> 'null' class: class java.lang.String bytes: [110, 117, 108, 108]
> {panel}
> i.e. the method annotated with @CompileStatic converts null to the actual string 'null' (which is quite a nasty surprise when trying to "speed things up" by adding @CompileStatic to existing non-static code).
> The same without @CompileStatic returns:
> {panel}
> 'null' class: class org.codehaus.groovy.runtime.NullObject bytes: null
> {panel}
> as expected.



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