Is there a marshaling exception when using jaxb?

I have java code and i'm trying to parse it and store it as XML file on my PC using JAXB but i have a marshaling exception: The JAXB code i'm using :
Furthermore, how is marshalling and unmarshalling done in JAXB?
As part of this process, JAXB provides methods for unmarshalling (reading) XML instance documents into Java content, and then marshalling (writing) Java content back into XML instance documents. JAXB also provides a way to generate XML schemas from Java objects.
Accordingly, how to Marshal a JAXB object into an XML string? To marshal a JAXB object into an XML string, you will need to create a StringResult and pass that to the marshal () method. Java 6 and later have the standard JAXB interfaces and factories for processing xml available in the java.xml.bind package. You can find more info about JAXB on the JAXB project web site.
In addition, what is the purpose of the JAXB marshaller interface?
The JAXB Marshaller interface is responsible for governing the process of serializing Java content trees i.e. Java objects to XML data. This marshalling to XML can be done to variety of output targets. Generally, to create marshaller you can reuse this code.
Additionally, how to avoid the JAXB exception in XML?
Marshaller jaxbMarshaller = jaxbContext.createMarshaller (); jaxbMarshaller.setProperty (Marshaller.JAXB_FORMATTED_OUTPUT, true); The XML file will be generated base don the RequestClass. All the other files would have to add the @XmlSeeAlso ( {RequestClass.class}) to avoid this exception.

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