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Difference between revisions of "User:Rick.barkhouse.oracle.com"

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EclipseLink MOXy 2.3 introduces the ability to refresh your '''JAXBContext's''' metadata at runtime.  This allows you to make changes to existing mappings in a live application environment and see those changes immediately without having to create a new '''JAXBContext'''.
 
EclipseLink MOXy 2.3 introduces the ability to refresh your '''JAXBContext's''' metadata at runtime.  This allows you to make changes to existing mappings in a live application environment and see those changes immediately without having to create a new '''JAXBContext'''.
  
In order to use the Metadata Refresh feature, your metadata information must be provided as either '''Nodes''' or '''MetadataSource'''.
+
In order to use the Metadata Refresh feature, your metadata information must be provided as either '''Node(s)''' or '''MetadataSource'''.
  
 
== Example ==
 
== Example ==
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</source>
 
</source>
  
Our '''JAXBContext''' is created in the standard way.
+
Our '''JAXBContext''' is created in the standard way:
 +
 
 +
<source lang="java">
 +
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
 +
 
 +
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 +
dbf.setNamespaceAware(true);
 +
DocumentBuilder db = dbf.newDocumentBuilder();
 +
InputStream metadataStream = classLoader.getResourceAsStream("example/eclipselink-oxm.xml";
 +
Document metadataDocument = db.parse(metadataStream);
 +
metadataStream.close();
 +
 
 +
Map<String, Object> props = new HashMap<String, Object>(1);
 +
props.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, metadataDocument);
 +
JAXBContext jc = JAXBContextFactory.createContext(new Class[] { Root.class }, props);
 +
</source>

Revision as of 10:13, 17 June 2011

bugzilla id: rick.barkhouse (at) oracle.com

committer id: rbarkhous

Location: Ottawa, Canada - Eastern Standard Time

  • Committer on Eclipse Persistence Services project - EclipseLink

Profession: Software Engineer

Currently working for Oracle Corporation on their TopLink product.

Also working with Eclipse Foundation on their EclipseLink product.





link="http://wiki.eclipse.org/EclipseLink"
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Refreshing Metadata

EclipseLink MOXy 2.3 introduces the ability to refresh your JAXBContext's metadata at runtime. This allows you to make changes to existing mappings in a live application environment and see those changes immediately without having to create a new JAXBContext.

In order to use the Metadata Refresh feature, your metadata information must be provided as either Node(s) or MetadataSource.

Example

Our example will be bootstrapped from the following EclipseLink OXM file:

<?xml version="1.0"?>
<xml-bindings
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="example">
    <java-types>
        <java-type name="Root">
            <java-attributes>
                <xml-element java-attribute="name" name="orig-name"/>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

Our JAXBContext is created in the standard way:

ClassLoader classLoader = ClassLoader.getSystemClassLoader();
 
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
InputStream metadataStream = classLoader.getResourceAsStream("example/eclipselink-oxm.xml";
Document metadataDocument = db.parse(metadataStream);
metadataStream.close();
 
Map<String, Object> props = new HashMap<String, Object>(1);
props.put(JAXBContextFactory.ECLIPSELINK_OXM_XML_KEY, metadataDocument);
JAXBContext jc = JAXBContextFactory.createContext(new Class[] { Root.class }, props);