[#XSTR-404] @XStreamImplicit() for ArrayList<ArrayList<Type>> throws ClassCastException

XStream

@XStreamImplicit() for ArrayList<ArrayList<Type>> throws ClassCastException

Created: 01/Jun/07 06:13 PM Updated: 25/Feb/08 05:01 PM

Component/s:

Core

Affects Version/s:

1.2.2

Fix Version/s:

1.3

JDK version and platform:

Sun 1.5.0_1 for Windows

Description

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...
@XStreamImplicit(itemFieldName="line")
ArrayList<ArrayList<Point>> lines;
...
Annotations.configureAliases(xstream, PolyLine.class); ...

throws

java.lang.ClassCastException:
sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
         at com.thoughtworks.xstream.annotations.Annotations.getFieldParameterizedType(Annotations.java:226)
        at com.thoughtworks.xstream.annotations.Annotations.configureClass(Annotations.java:161)
        at com.thoughtworks.xstream.annotations.Annotations.configureAliases(Annotations.java:49)

when configureAliases() is executed.

The old code I used for 1.2.1 still works and is a viable (although ugly) workaround:

xstream.addImplicitCollection(PolyLine.class, "lines", "line", ArrayList.class); // Workaround

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Change History

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Guilherme Silveira - 01/Jun/07 08:56 PM

Commited possible solution which allows ParameterizedTypes to contain other ParameterizedTypes.

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Joerg Schaible - 11/Jun/07 04:34 AM

Set resolution to fixed, still waiting for Klaus' comment and closing of the issue ...

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Paul van der Maas - 03/Sep/07 09:26 PM

This fix probably also fixes my issue, but I wanted to let you know anyway, so you can test it.

The problem Klaus is referring to also comes up when you use the @XStreamContainedType annotation on a type where the parameter type is also a parameterized type:

@XStreamContainedType()
public List<List<CarModel>> carModels = new ArrayList<List<CarModel>>();

Here's the exception:

java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to java.lang.Class
        at com.thoughtworks.xstream.annotations.Annotations.configureParameterizedTypes(Annotations.java:249)
        at com.thoughtworks.xstream.annotations.Annotations.configureClass(Annotations.java:132)
        at com.thoughtworks.xstream.annotations.Annotations.configureAliases(Annotations.java:49)

Also, I was wondering if the fix actually looked at contained types in contained types, or if it is just a superficial fix.
For instance, in my example, if I had an alias defined for CarModel, would the alias be registered or not? I think it should be.

I couldn't get a 'lastest snapshot' from your repository, the links on this page don't work:
http://xstream.codehaus.org/download.html

How do I get a recent snapshot?

Thanks,

Paul

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Joerg Schaible - 25/Feb/08 05:01 PM

Closing issues before next release.