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Difference between revisions of "EclipseLink/UserGuide/MOXy/Runtime/Bootstrapping"

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== Bootstrapping from EclipseLink OXM ==
 
== Bootstrapping from EclipseLink OXM ==
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If you would like to have more control over how your classes will be mapped to XML, you can instead bootstrap from an EclipseLink OXM bindings file. Using this approach, you can take advantage of EclipseLink's robust mappings framework and customize how each complex type in XML maps to its Java counterpart.
  
 
Links to the actual OXM files are passed in via the '''properties''' parameter, using a special key, '''JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY'''.  The value of this key will be a handle to the OXM metadata file, in the form of one of the following:
 
Links to the actual OXM files are passed in via the '''properties''' parameter, using a special key, '''JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY'''.  The value of this key will be a handle to the OXM metadata file, in the form of one of the following:
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* '''org.w3c.dom.Node'''
 
* '''org.w3c.dom.Node'''
 
* '''org.xml.sax.InputSource'''
 
* '''org.xml.sax.InputSource'''
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When bootstrapping from OXM, the package specified by '''contextPath''' must contain a '''jaxb.properties''' file that specifies the EclipseLink '''JAXBContextFactory'''.
 
When bootstrapping from OXM, the package specified by '''contextPath''' must contain a '''jaxb.properties''' file that specifies the EclipseLink '''JAXBContextFactory'''.
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<source lang="java">
 
<source lang="java">

Revision as of 13:14, 10 June 2011

EclipseLink MOXy

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Elug api package icon.png Key API

Bootstrapping

EclipseLink MOXy offers several options when creating your JAXBContext. You have the option of bootstrapping from:

  • A list of one or more JAXB-annotated Classes
  • A list of one or more EclipseLink OXM Bindings Files defining the mappings for your Java classes
  • A combination of Classes and OXM files
  • A Session name, referring to an EclipseLink Session defined in sessions.xml


JAXBContext API

The following methods on JAXBContext are used to create new instances of JAXBContexts:

public static JAXBContext newInstance(Class... classesToBeBound) throws JAXBException
 
public static JAXBContext newInstance(Class[] classesToBeBound, Map<String,?> properties) throws JAXBException
 
public static JAXBContext newInstance(String contextPath) throws JAXBException
 
public static JAXBContext newInstance(String contextPath, ClassLoader classLoader) throws JAXBException
 
public static JAXBContext newInstance(String contextPath, ClassLoader classLoader, Map<String,?> properties) throws JAXBException
  • classesToBeBound - List of Java classes to be recognized by the new JAXBContext.
  • contextPath - List of Java package names that contain mapped classes.
  • classLoader - The class loader used to locate the mapped classes.
  • properties - A map of additional properties.


Bootstrapping from Classes

If you already have a collection of Java Classes annotated with JAXB annotations, you can provide an list of these Classes directly:

JAXBContext context = JAXBContext.newInstance(Company.class, Employee.class);


Bootstrapping from EclipseLink OXM

If you would like to have more control over how your classes will be mapped to XML, you can instead bootstrap from an EclipseLink OXM bindings file. Using this approach, you can take advantage of EclipseLink's robust mappings framework and customize how each complex type in XML maps to its Java counterpart.

Links to the actual OXM files are passed in via the properties parameter, using a special key, JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY. The value of this key will be a handle to the OXM metadata file, in the form of one of the following:

  • java.io.File
  • java.io.InputStream
  • java.io.Reader
  • java.net.URL
  • javax.xml.stream.XMLEventReader
  • javax.xml.stream.XMLStreamReader
  • javax.xml.transform.Source
  • org.w3c.dom.Node
  • org.xml.sax.InputSource


When bootstrapping from OXM, the package specified by contextPath must contain a jaxb.properties file that specifies the EclipseLink JAXBContextFactory.


InputStream iStream = myClassLoader.getResourceAsStream("example/eclipselink-oxm.xml");
 
Map<String, Object> properties = new HashMap<String, Object>();
properties.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, iStream);
 
JAXBContext context = JAXBContext.newInstance("example", myClassLoader, properties);


Bootstrapping from Context Path

ObjectFactory

jaxb.index

sessions.xml