Do not use JAX-RPC Calendar and other Date data types

This rule flags references to any of the following schema types: http://www.w3.org/2001/XMLSchema:duration, http://www.w3.org/2001/XMLSchema:dateTime, http://www.w3.org/2001/XMLSchema:time, http://www.w3.org/2001/XMLSchema:date, http://www.w3.org/2001/XMLSchema:gYearMonth, http://www.w3.org/2001/XMLSchema:gYear, NAMESPACE:gMonth, http://www.w3.org/2001/XMLSchema:gDay

These schema types and their JAX-RPC related Java types java.util.String and java.util.Calendar are not supported by JAX-WS.
Migration to JAX-WS and JAXB will require the use of those schema types with the supported Java type javax.xml.datatype.XMLGregorianCalendar instead.

An example of a JAX-RPC Calendar class looks like:

import java.util.Calendar;
import java.rmi.RemoteException;
    
public Calendar calculateShippingDate(Calendar requestedDate) throws RemoteException; {
    // Set the date to the date that was sent to us and add 7 days.
    requestedDate.add(java.util.Calendar.DAY_OF_MONTH, 7);
    // . . .
    
    return requestedDate;     
    }

An example of a JAX-WS XMLGregorianCalendar class looks like:

import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.datatype.DatatypeConfigurationException;
    
public XMLGregorianCalendar calculateShippingDate(
    XMLGregorianCalendar requestedDate) {
    try {
        // Create a data type factory.
        DatatypeFactory df = DatatypeFactory.newInstance();
        // Set the date to the date that was sent to us and add 7 days.
        Duration duration = df.newDuration("P7D");
        requestedDate.add(duration);
    } catch (DatatypeConfigurationException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        }
        // . . .
    
        return requestedDate;
    }

As you can see from the example above the input parameter has changes from type java.util.Calendar to javax.xml.datatype.XMLGregorianCalendar .
This is because the WSDL specified these parameters to be of type, xsd:dateTime , JAX-RPC maps this data type to java.util.Calendar , while JAX-WS and JAXB maps it to javax.xml.datatype.XMLGregorianCalendar .