Multiple collections in an object get collapsed into one JSON array

Consider the following class:

@XmlRootElement(name="moduleLinks")
public static class ModuleLinkSet

{ @XmlElement(name="installation") Collection<Installation> installations; @XmlElement(name="module") Collection<Module> modules; }

Given an object of this class where installations contains two objects that serialize to

{id:1}

and

{id:2}

, and modules contain two objects that serialize to

{id:3}

and

{id:4}

, I was expecting a JSON serialization like

{
moduleLinks: {
installation: [

{id:1}

{id:2}

],
module: [

{id:3}

{id:4}

]
}
}

What I actually get is

{
moduleLinks: {
installation: [

{id:1}

{id:2}

, {module:{id:3}}, {module:{id:4}} ]
}
}

This looks very wrong to me.

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