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https://issues.apache.org/jira/browse/GROOVY-6567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-6567.
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> delegate is NullObject instance for closure metamethods invoked on null
> -----------------------------------------------------------------------
>
> Key: GROOVY-6567
> URL: https://issues.apache.org/jira/browse/GROOVY-6567
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.0-rc-1
> Reporter: Lari Hotari
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.0-alpha-3
>
>
> NullObject shouldn't be exposed outside groovy internals.
> This code example shows when NullObject leaks to application code:
> {code}
> Object.metaClass.delegateClass = {
> delegate?.getClass()
> }
> println null.delegateClass().name
> {code}
> This prints out "org.codehaus.groovy.runtime.NullObject".
> -------
> possible solution:
> I assume that NullObject should be "filtered" in [ClosureMetaMethod|
> https://github.com/groovy/groovy-core/blob/master/src/main/org/codehaus/groovy/runtime/metaclass/ClosureMetaMethod.java#L77].
> {code}
> public Object invoke(final Object object, Object[] arguments) {
> Closure cloned = (Closure) callable.clone();
> cloned.setDelegate(object);
> arguments = coerceArgumentsToClasses(arguments);
> return doCall.invoke(cloned, arguments);
> }
> {code}
> replacing "cloned.setDelegate(object)" with
> {code}
> cloned.setDelegate(!(object instanceof NullObject) ? object : null)
> {code}
> would prevent the leak of NullObject in ClosureMetaMethod class.
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