Adding namespaces to root element of xml using jaxb - jaxb

Question

I am creating an xml file whose root elemenet structure shuould be like:
<RootElement xmlns="http://www.mysite.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mysite.com/abc.xsd">
i created package-info.java class but i can get only one namespace by writing this code:
#XmlSchema(
namespace = "http://www.mysite.com",
elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package myproject.myapp;
import javax.xml.bind.annotation.XmlSchema;
Any idea?

Answer 1

Below is some demo code that will produce the XML you are looking for. You can use the Marshaller.JAXB_SCHEMA_LOCATION property to specify the schemaLocation this will cause the http://www.w3.org/2001/XMLSchema-instance namespace to be automatically declared.
Demo
package myproject.myapp;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(RootElement.class);
RootElement rootElement = new RootElement();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_SCHEMA_LOCATION, "http://www.mysite.com/abc.xsd");
marshaller.marshal(rootElement, System.out);
}
}
Output
Below is the output from running the demo code.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<RootElement xmlns="http://www.mysite.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mysite.com/abc.xsd"/>
package-info
This is the package-info class from your question.
#XmlSchema(
namespace = "http://www.mysite.com",
elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED
)
package myproject.myapp;
import javax.xml.bind.annotation.*;
RootElement
Below is a simplified version of your domain model:
package myproject.myapp;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name="RootElement")
public class RootElement {
}

Answer 2

In the older Jaxb you can specify additional namespaces using #XmlSeeAlso and in the newer Jaxb you can use #XmlNs in package-info.java see this answer: https://stackoverflow.com/a/63559294/447503