Question

Convert POJO to a jaxb ObjectFactory

Asked by: cwatkins

How to convert POJO to a jaxb ObjectFactory using marshalling?

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Asked On
2009-05-07 at 21:02:06ID24391379
Tags

java jaxb

Topics

JAXP & SAX (XML APIs)

,

Java Programming Language

Participating Experts
2
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0
Comments
7

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Answers

 

by: CEHJPosted on 2009-05-08 at 00:20:22ID: 24333677

What's your goal here - what do you intend to be your end product?

 

by: CEHJPosted on 2009-05-08 at 00:22:13ID: 24333685

If, as i think, you want to end up with xml, see

http://www.onjava.com/pub/a/onjava/2004/12/15/jaxb.html

 

by: gibu_georgePosted on 2009-05-08 at 03:17:52ID: 24334566

 

by: cwatkinsPosted on 2009-05-08 at 07:44:32ID: 24336526

I have an application that returns a POJO.  
There are different POJO structures.  Meaning, a POJO could be an object, a list of objects, map, or an object that is comprised of other objects (e.g., 1-1 or 1-n relationship).
I want to be able to convert the POJO to XML via jaxb Marshaller.
Afterwards, I want to be able to unmarshal the generated XML for a different application.

Example:
 
public void generateXml(List<pojoObj> myPojoObj) throws JAXBException {
 5    
 9     // Get a JAXB Context for the object we created above
10     JAXBContext context = JAXBContext.newInstance(pojoObj.getClass());
11
12     // To convert ex to XML
13     Marshaller marshaller = context.createMarshaller();
14
15     // Format the resulting XML
16     marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
17     StringWriter sw = new StringWriter();
18
19     // marshall the object to XML
20     marshaller.marshal(myPojoObj, sw);
21
22     // print it out for this example
23     System.out.println(sw.toString());
24   }
 
When I execute the  code snippet, the following exception occurs:
 
unable to marshal type "java.util.ArrayList"
as an element because it is missing an @XMLRootElement annotation
                                              
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by: cwatkinsPosted on 2009-05-08 at 09:24:24ID: 24337658

Basically, I want to be able to marshal an object without @XmlRootElement

 

by: CEHJPosted on 2009-05-08 at 09:29:36ID: 24337715

Try generating a schema from the object

 

by: cwatkinsPosted on 2009-08-31 at 20:45:14ID: 25228405

There are POJO that can easily be marshall/unmarshal using the POJO corresponding XML.  However, there are arbitrary objects in which there is no associated POJO.  Therefore,  I was able to use XMLEncoder create archives of any Java objects.  
Referene: http://java.sun.com/products/jfc/tsc/articles/persistence4/

20120131-EE-VQP-002

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