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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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