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https://issues.apache.org/jira/browse/TAP5-729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship updated TAP5-729:
--------------------------------------
Labels: bulk-close-candidate generics (was: bulk-close-candidate)
> Tapestry IOC proxies have incorrect implementation when interface method uses
> a covariant return type (causes AbstractMethodError)
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-729
> URL: https://issues.apache.org/jira/browse/TAP5-729
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-ioc
> Affects Versions: 5.1.0.5
> Reporter: Paul Field
> Labels: bulk-close-candidate, generics
>
> Here's a Junit 3 test case to demonstrate:
> import junit.framework.TestCase;
> import org.apache.tapestry5.ioc.Registry;
> import org.apache.tapestry5.ioc.RegistryBuilder;
> import org.apache.tapestry5.ioc.ServiceBinder;
> public class ProxyText extends TestCase {
> private Registry registry;
> @Override
> protected void setUp() throws Exception {
> RegistryBuilder builder = new RegistryBuilder();
> builder.add(AppModule.class);
> registry = builder.build();
> registry.performRegistryStartup();
> }
> public void testRegistryWorks() {
> assertEquals(new Integer(1),
> registry.getService(SuperIFace.class).get());
> }
> public static class AppModule {
> public static void bind(ServiceBinder binder) {
> binder.bind(IFace.class, Impl.class);
> }
> }
> public interface SuperIFace {
> Number get();
> }
> public interface IFace extends SuperIFace {
> Integer get();
> }
> public static class Impl implements IFace {
> public Integer get() {
> return 1;
> }
> }
> }
> -----
> The result is:
> java.lang.AbstractMethodError: $IFace_1218d10684a.get()Ljava/lang/Number;
> Note that if you change SuperIFace to:
> public interface SuperIFace {
> Integer get();
> }
> the test works - demonstrating that the problem is to do with the use of a
> covariant return type in IFace.
> BTW, this has turned up in code for testing where I want to create
> sub-interfaces that provide additional testing facilities for fake services
> and I need to control the particular types that are returned by the fake
> implementation.
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