[jira] [Updated] (TAP5-1480) Couldn't create property conduits for generic interfaces

["Howard M. Lewis Ship (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAP5-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard M. Lewis Ship updated TAP5-1480:
---------------------------------------

    Labels: generics  (was: )
    
> Couldn't create property conduits for generic interfaces
> --------------------------------------------------------
>
>                 Key: TAP5-1480
>                 URL: https://issues.apache.org/jira/browse/TAP5-1480
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-ioc
>    Affects Versions: 5.2
>            Reporter: Ivan Khalopik
>              Labels: generics
>
> Couldn't create property conduits for generic interfaces.
> public class TestTapestry {
>   @Test
>   public void test() {
>     final PropertyAccess access = new PropertyAccessImpl();
>     final ClassPropertyAdapter adapter = access.getAdapter(NamedEntity.class);
>   }
>   public static interface Entity<T extends Serializable> {
>     T getId();
>   }
>   public static interface NamedEntity extends Entity<Long> {
>     String getName();
>   }
> }
> This test will throw an exception:
> Caused by: java.lang.NullPointerException
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.extractActualType(GenericsUtils.java:143)
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.extractActualTypeAsClass(GenericsUtils.java:174)
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.extractGenericReturnType(GenericsUtils.java:40)
> 	at org.apache.tapestry5.ioc.internal.services.ClassPropertyAdapterImpl.<init>(ClassPropertyAdapterImpl.java:50)
> 	at org.apache.tapestry5.ioc.internal.services.PropertyAccessImpl.buildAdapter(PropertyAccessImpl.java:99)
> 	... 33 more
> It is thrown because of this lines (GenericsUtils:140-143)
>   final Class descendantClass = asClass(descendant);
>   final ParameterizedType parameterizedType = (ParameterizedType) descendantClass.getGenericSuperclass();
>   extractedType = parameterizedType.getActualTypeArguments()[typeArgumentIndex];
> It gets generic superclass, but it is null, there are only interfaces.
> So it makes impossible to create property bindings for such beans.

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