ArrayIndexOutOfBoundsException in OrderRetainingMap when serialiazing nested class in Oracle JDK8-ea-b108

A nested class cannot be serialized by XStream 1.4.5 in Oracle JDK8 Early Access Build b108.

Code sample:

public class OrderRetainingMapTest {
private static class Class1 implements Serializable {
private final int fValue1;

private Class1(int value1)

{ fValue1 = value1; }

@Override
public String toString()

{ return String.valueOf(fValue1); }

}

private static class Class2 extends Class1 {
private final int fValue2;

protected Class2(int value1, int value2)

{ super(value1); fValue2 = value2; }

@Override
public String toString()

{ return super.toString() + "/" + String.valueOf(fValue2); }

}

private static final class Class3 extends Class2 {
private final int fValue3;

private Class3(int value1, int value2, int value3)

{ super(value1, value2); fValue3 = value3; }

@Override
public String toString()

{ return super.toString() + "/" + String.valueOf(fValue3); }

}

@Test
public void testXStreamClass3ToXml()

{ XStream xstream = new XStream(new DomDriver()); xstream.toXML(new Class3(0, 0, 0)); }

}

causes

java.lang.ArrayIndexOutOfBoundsException: -1
at com.thoughtworks.xstream.core.util.OrderRetainingMap.entrySet(OrderRetainingMap.java:77)
at java.util.HashMap.putMapEntries(HashMap.java:511)
at java.util.HashMap.putAll(HashMap.java:784)
at com.thoughtworks.xstream.core.util.OrderRetainingMap.<init>(OrderRetainingMap.java:36)
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:135)
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldsFor(FieldDictionary.java:76)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:127)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:83)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:73)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)
at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)
at com.thoughtworks.xstream.XStream.marshal(XStream.java:993)
at com.thoughtworks.xstream.XStream.marshal(XStream.java:982)
at com.thoughtworks.xstream.XStream.toXML(XStream.java:955)
at com.thoughtworks.xstream.XStream.toXML(XStream.java:942)
at com.thoughtworks.xstream.OrderRetainingMapTest.testXStreamClass3ToXml(OrderRetainingMapTest.java:69)

It seems that the HashMap#putAll(Map) call in the constructor of OrderRetainingMap with map parameter

public class OrderRetainingMap extends HashMap {
...
public OrderRetainingMap(Map m)

{ super(); putAll(m); }

...
}

is no more compatible with the HashMap implementation.

Potential fixes:

1) define putAll(Map) in OrderRetainingMap

public void putAll(Map m) {
for (Entry e : m.entrySet())

{ put(e.getKey(), e.getValue()); }

}

or

2) subclass LinkedHashMap

public class OrderRetainingMap extends LinkedHashMap {
public OrderRetainingMap()

{ super(); }

public OrderRetainingMap(Map m)

{ super(m); }

}

or

3) use LinkedHashMap instead of OrderRetainingMap, drop OrderRetainingMap

The same problem seems to occur with IBM SDK, see http://jira.codehaus.org/browse/XSTR-739.