ImpliciteCollections in parent/child classes with the same item type

Assume there is the following class hierarchy

public class Parent
extends Object

{ public ArrayList<I> parentCollection = null; }

public class Child1
extends Parent

{ public ArrayList<I> child1Collection = null; }

public class Child2
extends Parent

{ public ArrayList<I> child2Collection = null; }

and the following XStream setup:

private final static XStream setupSerializer()

{ final XStream s = new XStream ( new PureJavaReflectionProvider(), new DomDriver() ); // Parent s.alias("parent", Parent.class); s.addImplicitCollection(Parent.class, "parentCollection", I.class); // Child1 s.alias("child1", Child1.class); s.addImplicitCollection(Child1.class, "child1Collection", I.class); // Child2 s.alias("child2", Child2.class); s.addImplicitCollection(Child2.class, "child2Collection", I.class); // IImpl1 s.alias("i1", IImpl1.class); // IImpl2 s.alias("i2", IImpl2.class); return s; }

then an attempt to deserialize the string "<child1><i1/><i2/><i1/></child1>"
leads to the following exception:

com.thoughtworks.xstream.converters.ConversionException: No such field com.vn.xml.serialization.Child1.child2Collection : No such field com.vn.xml.serialization.Child1.child2Collection
---- Debugging information ----
message : No such field com.vn.xml.serialization.Child1.child2Collection
cause-exception : com.thoughtworks.xstream.converters.reflection.ObjectAccessException
cause-message : No such field com.vn.xml.serialization.Child1.child2Collection
class : com.vn.xml.serialization.Child1
required-type : com.vn.xml.serialization.Child1
path : /child1/i1
-------------------------------
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:89)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:60)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:137)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:923)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:909)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:853)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:845)
at com.vn.xml.serialization.ImpliciteCollectionsTest.testImpliciteCollection(ImpliciteCollectionsTest.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: com.thoughtworks.xstream.converters.reflection.ObjectAccessException: No such field com.vn.xml.serialization.Child1.child2Collection
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.field(FieldDictionary.java:94)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.getFieldType(PureJavaReflectionProvider.java:151)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.writeValueToImplicitCollection(AbstractReflectionConverter.java:264)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:236)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:162)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
... 26 more

Changing setup sequence to Child1/Child2/Parent solves the problem.

Simple JUnit is attached