XStreamMarshaller + JsonHierarchicalStreamDriver + JsonWriter.DROP_ROOT_MODE produce empty output [SPR-6939]

[spring-projects-issues]

Yevhen Yaremchuk opened SPR-6939 and commented

When using XStreamMarshaller for serializing object to JSON by customizing StreamDriver to skip root node resulting in empty output. Configuration of StreamDriver illustrated by the following snapshot

final XStreamMarshaller marshaller = new XStreamMarshaller();

marshaller.setStreamDriver(new JsonHierarchicalStreamDriver() {
    public HierarchicalStreamWriter createWriter(Writer writer) {
        return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
    }
});

At the same time using XSTream directly works just fine.

final XStream xStream = new XStream(new JsonHierarchicalStreamDriver() {
    public HierarchicalStreamWriter createWriter(Writer writer) {
        return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
    }
});

---

Affects: 3.0 GA

Referenced from: commits ac9a625

[spring-projects-issues]

Arjen Poutsma commented

Can you indicate how you use the marshaller/xstream instance later on? Specifically: are you writing to a DOM tree, an OutputStream, a Writer, XMLStreamWriter, etc?

[spring-projects-issues]

Yevhen Yaremchuk commented

I used StringResult for testing. Item is simple bean with two properties (int id and String status)

final StringResult result = new StringResult();
final Item item = new Item(12, "new");
		
try {
        marshaller.getXStream().setMode(XStream.NO_REFERENCES);
        marshaller.getXStream().alias("item", Item.class);
	marshaller.marshal(item, result);
} catch (Exception e) {
// TODO: handle exception
}

[spring-projects-issues]

Arjen Poutsma commented

Fixed.