Hi, I'm illustrating an interesting issue with generic classes in our
data model. Here is the very simple page class and template used:
public class TestPageGenericProb
{
@Property
private List<Foo> _foos = new LinkedList<Foo>();
void setupRender ()
{
Foo f1 = new Foo();
_foos.add( f1 );
}
}
TestPageGenericProb.tml:
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<body>
<t:grid source="foos" />
</body>
</html>
The data classes are
public class Foo extends Bla<String>
{
private Long _id;
public Long getId () { return _id; }
public void setId (Long id) { _id = id; }
}
public abstract class Bla<U> extends Baz<U, Integer>
{
}
public abstract class Baz <V, W>
{
private W _dealyBob;
public W getDealyBob () { return _dealyBob; }
public void setDealyBob (W dealyBob) { _dealyBob = dealyBob; }
}
On visiting the page, I get Render queue error in
SetupRender[TestPageGenericProb:grid]: Failure reading parameter
'model' of component TestPageGenericProb:grid:
java.lang.ArrayIndexOutOfBoundsException: 1.
The first several elements of the stack trace are:
#
org.apache.tapestry.ioc.internal.util.GenericsUtils.extractGenericReturnType(GenericsUtils.java:75)
#
org.apache.tapestry.ioc.internal.services.ClassPropertyAdapterImpl.<init>(ClassPropertyAdapterImpl.java:47)
#
org.apache.tapestry.ioc.internal.services.PropertyAccessImpl.buildAdapter(PropertyAccessImpl.java:93)
#
org.apache.tapestry.ioc.internal.services.PropertyAccessImpl.getAdapter(PropertyAccessImpl.java:65)
#
org.apache.tapestry.internal.services.BeanModelSourceImpl.create(BeanModelSourceImpl.java:74)
# org.apache.tapestry.corelib.components.Grid$1.get(Grid.java:336)
#
org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.readParameter(InternalComponentResourcesImpl.java:233)
#
org.apache.tapestry.internal.structure.InternalComponentResourcesImpl.readParameter(InternalComponentResourcesImpl.java:248)
# org.apache.tapestry.corelib.components.Grid._$read_parameter_model(Grid.java)
# org.apache.tapestry.corelib.components.Grid.setupDataSource(Grid.java:382)
# org.apache.tapestry.corelib.components.Grid.setupRender(Grid.java:367)
# org.apache.tapestry.corelib.components.Grid.setupRender(Grid.java)
It doesn't matter if I add data to my original foo instance for all
the fields, same result. However, if I fold the implementation of
Baz into Bla, I render fine. Thoughts?
--
Bill @ PeoplePad
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
