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https://issues.apache.org/jira/browse/LANG-776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Benson resolved LANG-776.
------------------------------
Resolution: Fixed
Fix Version/s: 3.2
rev 1203429
> TypeUtilsTest contains incorrect type assignability assertion due to
> lost/skipped type variable information during the decision process
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LANG-776
> URL: https://issues.apache.org/jira/browse/LANG-776
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.reflect.*
> Affects Versions: 3.1
> Reporter: Matt Benson
> Assignee: Matt Benson
> Fix For: 3.2
>
>
> {{TypeUtilsTest}} originally contained the following under
> #{{testIsAssignable()}}:
> {code}
> Assert.assertTrue("WRONG!", TypeUtils.isAssignable(dingType, disType));
> {code}
> For background:
> {code}
> public interface This<K, V> {
> }
> public class Other<T> implements This<String, T> {
> }
> public class Thing<Q> extends Other<B> {
> }
> {code}
> {{<B>}} refers to a type parameter on the {{TypeUtilsTest}} class itself.
> {{disType}} and {{dingType}} refer to the generic types of the following
> fields, respectively:
> {code}
> public This<String, String> dis;
> public Thing ding;
> {code}
> Thus the assertion in question declares that type {{Thing}} is assignable to
> {{This<String, String>}}. If we start at {{This}} we can see that the
> implementing class {{Other}} maps its {{T}} type parameter to the {{V}} type
> parameter of {{This}}. From this point we can proceed down to {{Thing}} and
> see that it maps the {{B}} type parameter of the enclosing {{TypeUtilsTest}}
> class to the {{T}} type parameter of {{Other}}. Thus it is fairly obvious
> that only a {{TypeUtilsTest<String>.Thing}} is assignable to {{This<String,
> String>}}. From this we can determine that the intent of the message in the
> original test assertion must indeed have been to flag an incorrect assertion.
> This is the associated bug report.
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