[JsonToXml]Different output at certain message body

[Hooghof]

This following json message body transforms in Camel 4 not equal to Camel 2:

{
    "test": null
}

The settings of the JsonTo Xml component are:

This is the expected result (Camel 2):

<?xml version="1.0" encoding="UTF-8"?>
<root><test json_null="true"/></root>

This is the result in Camel 4:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <test>null</test>
</root>

In other combinations of options, the output of the Camel 4 component differs from Camel 2 as well.

https://dovetailworld.atlassian.net/browse/DOV-2222