XSD Java类生成

Question

Today I send someone a xsd file to generate java classes for me. He said to me that nothing is downloaded from the internet during the XML binding process.

I still can't believe that, because if I'm opening the .xsd file, there is not much in it. For example:

 <xs:element name="Country">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="Code" type="xs:string" minOccurs="1" maxOccurs="1"/>
            <xs:element name="Name" type="xs:string" minOccurs="1" maxOccurs="1"/>
        </xs:sequence>
    </xs:complexType>
</xs:element>

Is generating a java class named CountryDocument.java and is 179 lines of code long. How is this process working?

I still believe that internet is used during the process, because there are openAPI urls in the xsd file.

Answer 1

Someone is likely using JAXB or a similar framework:

Java Architecture for XML Binding (JAXB) allows Java developers to map Java classes to XML representations. JAXB provides two main features: the ability to marshal Java objects into XML and the inverse, ie to unmarshal XML back into Java objects. In other words, JAXB allows storing and retrieving data in memory in any XML format, without the need to implement a specific set of XML loading and saving routines for the program's class structure. It is similar to xsd.exe and XmlSerializer in the .NET Framework.

Source: https://en.wikipedia.org/wiki/Java_Architecture_for_XML_Binding