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https://issues.apache.org/jira/browse/GROOVY-6154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477362#comment-17477362
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Eric Milles commented on GROOVY-6154:
-------------------------------------
In order to support "def o = null; o.getAge()" you need to add an overload for
{{NullObject}}.
{code:java}
import org.codehaus.groovy.runtime.NullObject;
class Extension {
public static int getAge(Object o) { return 15; }
public static int getAge(NullObject o) { return 15; }
}
{code}
> Property added as getProperty() extension method for every object isn't
> accessible for NullObject
> -------------------------------------------------------------------------------------------------
>
> Key: GROOVY-6154
> URL: https://issues.apache.org/jira/browse/GROOVY-6154
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Reporter: Mykola Golubyev
> Priority: Major
>
> When you add an extension method using
> org.codehaus.groovy.runtime.ExtensionModule
> static int getAge(Object o) { return 15; }
> you can call the method using Groovy property shortcut like
> def value = 1
> assert value.age == 15
> assert value.getAge() == 15
> however when value is null Groovy property shortcut doesn't work
> but getAge() method still works as expected
> def value = null
> assert value.age == 15 // Cannot get property 'age' on null object
> assert value.getAge() == 15
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