Monday, 19 March 2012

Java Interview questions: -Can you explain marshaling & unmarshalling in Java?

This is the most practical oriented Java Interview Questions which may be asked during the Interview by the Interviewer.

Marshalling:

Marshalling creates an XML document from a content tree
To marshal a content tree
  • Create a JAXBContext object
  • Create a Marshaller object (Marshaller marshaller = jaxbContext.createMarshaller();)
  • Set required properties using setProperty method of Marshaller marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, new Boolean(true));
  • Call the marshal method marshaller.marshal(collection, new FileOutputStream("jaxbOutput.xml"));
Unmarshalling:

Unmarshalling an XML document means creating a tree of content objects that represents the content and organization of the document
To unmarshal an XML document,
  • Create a JAXBContext object(
    JAXBContext jaxbContext = JAXBContext.newInstance("package name ");
  • Create an Unmarshaller object
    Unmarshaller unmarshaller = jc.createUnmarshaller();
  • Call the unmarshal method unmarshaller.unmarshal(new File( "xml name"));
  • Use the get methods in the schema-derived classes to access the XML data
See the following video on Introduction to Hibernate and it concepts: -



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