List and Set implementations are not marshalled with JAXB?

Snap of code what I was doing:

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@XmlRootElement public class FooBar { public String title; public FooBar(String t) { this.title = t; } } @XmlRootElement @XmlSeeAlso({FooBar.class}) public class FooBarSet extends ArrayList<FooBar> { public FooBarSet() { this.add(new FooBar("FooBar")); } }

Then, while marshaling:

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JAXBContext ctx = JAXBContext.newInstance(FooBar.class); Marshaller msh = ctx.createMarshaller(); msh.marshal(new FooBar(), System.out);

This is what I saw:

1 2	<?xml version="1.0"?> <FooBarSet/>

Why I am not getting the list of FooBar ??????

The Answer is the elements to be marshalled must be public, or have the @XMLElement anotation. The ArrayList class and my class FooBarSet do not match any of these rules. I have to define a method to offer the FooBar values, and anotate it.

So the modified class is:

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@XmlRootElement @XmlSeeAlso({FooBar.class}) public class FooBarSet extends ArrayList<FooBar> { public FooBarSet() { this.add(new FooBar("FooBar")); } @XmlElement(name = "FooBar") public List<FooBar> getFooBarSet() { return this; } }

Now the output:

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<fooBarSet> <FooBar> <title>FooBar</title> </FooBar> </fooBarSet>