Why we need JAXB?
The remote components (written in Java) of web services uses XML as a mean to exchange messages between each other. Why XML? Because XML is considered light weight option to exchange message on Networks with limited resources.
So often we need to convert these XML documents into objects and vice versa. E.g: Simple Java POJO Employee can be used to send Employee data to remote component( also a Java programme).
class Employee{
String name;
String dept;
....
}
This Pojo should be converted (Marshall) in to XML document as follow:
<Employee>
<Name>...</Name>
<Department>...</Department>
</Employee>
And at the remote component, back to Java object from XML document (Un-Marshall).
What is JAXB?
JAXB is a library or a tool to perform this operation of Marshalling and UnMarshalling. It spares you from this headache, as simple as that.
