[jira] [Assigned] (TAP5-2032) GenericsUtils does not handle generics properly when extracting the actual type

["Thiago H. de Paula Figueiredo (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAP5-2032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thiago H. de Paula Figueiredo reassigned TAP5-2032:
---------------------------------------------------

    Assignee: Thiago H. de Paula Figueiredo

> GenericsUtils does not handle generics properly when extracting the actual type
> -------------------------------------------------------------------------------
>
>                 Key: TAP5-2032
>                 URL: https://issues.apache.org/jira/browse/TAP5-2032
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-ioc
>    Affects Versions: 5.3.6
>            Reporter: DI Florian Hackenberger
>            Assignee: Thiago H. de Paula Figueiredo
>
> We have the following interfaces / classes
> public interface IPersonWithRoleAssociation<A> extends IEntityAssociationWithInfo<A, Person> {
> 	PersonRole getRole();
> 	void setRole(PersonRole role);
> }
> public interface IEntityAssociationWithInfo<P, C> {
> 	P getParent();
> 	void setParent(P parent);
> 	C getChild();
> 	void setChild(C child);
> }
> public class Person implements Serializable {
> 	....
> 	String name;
> 	public String getName() {
> 		return name;
> 	}
> }
> and the page:
> public class EditPersonsWithRoles {
> 	@Property(write=false) IPersonWithRoleAssociation<A> personWithRole;
> }
> and the template snippet:
> <t:textfield t:id="personSex" t:value="personWithRole.child.name"/>
> Leads to the following exception:
> Exception generating conduit for expression 'personWithRole.child.name': ...
> ...
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.resolve(GenericsUtils.java:388) ~[tapestry-ioc-5.3.6.jar:na]
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.resolve(GenericsUtils.java:128) ~[tapestry-ioc-5.3.6.jar:na]
> 	at org.apache.tapestry5.ioc.internal.util.GenericsUtils.extractActualType(GenericsUtils.java:74) ~[tapestry-ioc-5.3.6.jar:na]
> 	at org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.buildGetterMethodAccessTerm(PropertyConduitSourceImpl.java:1119) ~[tapestry-core-5.3.6.jar:na]
> At GenericsUtils.java:388 we have:
> resolved = ((ParameterizedType) t).getActualTypeArguments()[i];
> where:
> i = 1
> resolved = C
> ((ParameterizedType) t).getActualTypeArguments() = [org.topfive.entities.IPersonWithRoleAssociation<P>]
> so the problem seems to be that the code assumes that it can find the type information for C as the second generic parameter for IPersonWithRoleAssociation, when in fact is is the second generic parameter for the superclass IEntityAssociationWithInfo which IPersonWithRoleAssociation extends and passes C explicitly (Person). Everything is fine, if I use a marker interface for Person (IPerson) and declare:
> public interface IPersonWithRoleAssociation<A, P extends IPerson> extends IEntityAssociationWithInfo<A, P>



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