JavascriptObject.createObject().cast() ClassCastException

package net.sf.javaprinciples.simm.model;


public interface Attribute extends BaseType {
int getMaxCount();
void setMaxCount(int maxCount);
int getMinCount();
void setMinCount(int minCount);
String getNotes();
void setNotes(String notes);
}package net.sf.javaprinciples.simm.model;

import java.util.List;

public interface BaseType extends Identifiable {
Type getType();
void setType(Type type);
String getClassifier();
void setClassifier(String classifier);
List<Extension> getExtension();
void setExtension(List<Extension> extension);
}package net.sf.javaprinciples.simm.model;

import java.util.List;

public interface ComplexType extends BaseType {
String getBaseClassifier();
void setBaseClassifier(String baseClassifier);
List<Attribute> getAttributes();
void setAttributes(List<Attribute> attributes);
}package net.sf.javaprinciples.simm.model;


public interface Identifiable {
String getId();
void setId(String id);
String getName();
void setName(String name);
}package net.sf.javaprinciples.simm.model;

import java.util.List;

public interface Package extends Identifiable {
List<ComplexType> getComplexTypes();
void setComplexTypes(List<ComplexType> complexTypes);
}package net.sf.javaprinciples.simm.model;


public class AttributeImpl extends BaseTypeImpl implements Attribute {
protected AttributeImpl() {}

@Override
public final native int getMaxCount() /*-{
return this.maxCount;
}-*/;

@Override
public final native void setMaxCount(int maxCount) /*-{
this.maxCount = maxCount;
}-*/;


@Override
public final native int getMinCount() /*-{
return this.minCount;
}-*/;

@Override
public final native void setMinCount(int minCount) /*-{
this.minCount = minCount;
}-*/;


@Override
public final native String getNotes() /*-{
return this.notes;
}-*/;

@Override
public final native void setNotes(String notes) /*-{
this.notes = notes;
}-*/;

}package net.sf.javaprinciples.simm.model;

import java.util.List;
import java.util.ArrayList;

public class BaseTypeImpl extends IdentifiableImpl implements BaseType {
protected BaseTypeImpl() {}

@Override
public final Type getType() {
String internal = getTypeInternal();
return internal != null ? Type.valueOf(internal) : null;
}

private final native String getTypeInternal() /*-{
return this.type;
}-*/;

@Override
public final void setType(Type type) {
setTypeInternal(type == null ? null : type.name());
}

private final native void setTypeInternal(String type) /*-{
this.type = type;
}-*/;


@Override
public final native String getClassifier() /*-{
return this.classifier;
}-*/;

@Override
public final native void setClassifier(String classifier) /*-{
this.classifier = classifier;
}-*/;


@Override
public final List<Extension> getExtension() {
return findArray("extension");
}

@Override
public final native void setExtension(List<Extension> extension) /*-{
this.extension = extension;
}-*/;

}package net.sf.javaprinciples.simm.model;

import java.util.List;
import java.util.ArrayList;

public class ComplexTypeImpl extends BaseTypeImpl implements ComplexType {
protected ComplexTypeImpl() {}

@Override
public final native String getBaseClassifier() /*-{
return this.baseClassifier;
}-*/;

@Override
public final native void setBaseClassifier(String baseClassifier) /*-{
this.baseClassifier = baseClassifier;
}-*/;


@Override
public final List<Attribute> getAttributes() {
return findArray("attributes");
}

@Override
public final native void setAttributes(List<Attribute> attributes) /*-{
this.attributes = attributes;
}-*/;

}package net.sf.javaprinciples.simm.model;


public class IdentifiableImpl extends JavascriptObjectSupport implements Identifiable {
protected IdentifiableImpl() {}

@Override
public final native String getId() /*-{
return this.id;
}-*/;

@Override
public final native void setId(String id) /*-{
this.id = id;
}-*/;


@Override
public final native String getName() /*-{
return this.name;
}-*/;

@Override
public final native void setName(String name) /*-{
this.name = name;
}-*/;

}package net.sf.javaprinciples.simm.model;

import java.util.List;
import java.util.ArrayList;

public class PackageImpl extends IdentifiableImpl implements Package {
protected PackageImpl() {}

@Override
public final List<ComplexType> getComplexTypes() {
return findArray("complexTypes");
}

@Override
public final native void setComplexTypes(List<ComplexType> complexTypes) /*-{
this.complexTypes = complexTypes;
}-*/;

}

I have several GWT native POJOS and a corresponding interface (all attached)

I can call the following :

        Identifiable id = JavaScriptObject.createObject().cast();

        BaseType baseType = JavaScriptObject.createObject().cast();

        ComplexType complexType = JavaScriptObject.createObject().cast();

        Package aPackage = JavaScriptObject.createObject().cast();

        Attribute attribute = JavaScriptObject.createObject().cast();

When I debug through each of these lines all but the last lines execute a java line to create an object of {} and a simple type cast.

However the last line has an extra line of code inserted by the compiler.

  static Object castTo(Object src, JavaScriptObject dstId) {

    checkType(src == null || canCast(src, dstId));

    return src;

  }

This results in a ClassCastException being thrown.

Any pointers would be most appreciated.

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