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https://issues.apache.org/jira/browse/GROOVY-11823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18047943#comment-18047943
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Eric Milles commented on GROOVY-11823:
--------------------------------------
Given a setup like:
{code:groovy}
class Upper {
def propertyMissing(String name) {
if (name == 'fizz') return 'buzz'
throw new MissingPropertyException(name, getClass())
}
}
class Outer {
static class Inner extends Upper {
}
}
assert new Outer.Inner().fizz == 'buzz'
{code}
In order for the property "fizz" to be available from an inner class or enum,
the compiler-supplied MOP methods would need to delegate to super class methods
as part of their implementation.
> Check whether inserted metaprogramming methods in a static nested class
> override methods in a superclass and fail, warn, or make it work
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-11823
> URL: https://issues.apache.org/jira/browse/GROOVY-11823
> Project: Groovy
> Issue Type: Improvement
> Affects Versions: 4.0.29
> Reporter: Björn Kautler
> Priority: Major
>
> Given the following code:
> {code:groovy}@Grab('org.apache.groovy.geb:geb-spock:8.0.1')
> import geb.spock.GebSpec
> class Foo {
> static class Bar extends GebSpec {
> def bar() {
> println(browser.driver)
> println(driver)
> expect: true
> }
> }
> }{code}
> and assuming that either GROOVY-11822 was fixed or Geb changed to use
> {{void}} as return type so that the code actually compiles.
> Due to the Groovy compiler overwriting the {{propertyMissing}} and
> {{methodMissing}} methods, the {{println(driver)}} line no longer works,
> outside a static nested class it works as intended.
> This behavior is silent and at first very confusing to a user.
> One option - though an imho very bad one - would be to fail the build just
> like when you try to have any of those methods in your code directly.
> But, e.g. in this case, you might still be able to use the superclass, you
> here just have to be a bit more explicit and use {{browser.}} instead of the
> meatprogramming magic, so it would be sad if the solution is to fail the
> build.
> Maybe other two options would either a prominent compiler warning if those
> methods override ones from a superclass so that you at least have a chance to
> get aware of the problem,
> or maybe it could even be made in a way that the compiler-inserted methods
> consider the superclass methods by calling them at an appropriate place.
> The last solution would maybe be optimal as it would then work as expected,
> unless there are details I don't know why this cannot work.
> If some class does depend on those methods not being overwritten and not just
> provide convenience like {{GebSpec}}, they can probably also declare the
> methods {{final}} to prevent static nested subclasses being created.
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