How to add xml schema attributes into the java object using JAXB?

[kokababu]

Hi,

I have to add xml schema attributes into the java object.
Such as, my java object is User. This User object will be
represented as XML using JAXB. I generated XML
from User object successfully using JAXB. But I want to add xml schema attributes such as

<User 
    xmlns="http://testws/rest/schema"        
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://testws/rest/user UserSchema.xsd">
 
</User>

How do I add xmlns, xmlns:xsi, xsi:schemaLocation attributes in the User (root) element, using JAXB?
I tried with @xmlSchema annotation but it threw the following error:
Package annotations must be in file package-info.java

I would be grateful, if someone help me to solve this issue.