Examples of javax.xml.bind.JAXBContext

javax.xml.bind.JAXBContext
The JAXBContext provides the JAXB users anchor to the implmentation and hos generated classes. A JAXBContext is used to obtain instances of {@link javax.xml.bind.Marshaller}, {@link javax.xml.bind.Unmarshaller}, and {@link javax.xml.bind.Validator}. To obtain a JAXBContext, the application invokes
```
 JAXBContext context = JAXBContext.newInstance("com.mycompany:com.mycompany.xml"); 
```
The list of colon separated package names matches the list in the schemas used to generate classes. In other words: If you have a schema using package name "com.mycompany.xml", then this package name has to be part of the list.

The JAXBContext class will scan the given list of packages for a file called jaxb.properties. This file contains the name of an instantiation class in the property {@link #JAXB_CONTEXT_FACTORY}. (See {@link #newInstance(String)} fordetails on how the class name is obtained.) Once such a file is found, the given class is loaded via {@link ClassLoader#loadClass(java.lang.String)}. The JAXBContext class demands, that the created object has a method
```
 public static JAXBContext createContext(String pPath, ClassLoader pClassLoader) throws JAXBException; 
```
This method is invoked with the same path and {@link ClassLoader} thanabove. See {@link #newInstance(String,ClassLoader)}} for details on the choice of the {@link ClassLoader}.

The created context will scan the same package path for implementation specific configuration details (in the case of the JaxMe application a file called Configuration.xml in any of the packages) and do whatever else is required to initialize the runtime. In particular it will invoke {@link DatatypeConverter#setDatatypeConverter(DatatypeConverterInterface)}.
@author JSR-31 @since JAXB1.0 @see Marshaller @see Unmarshaller @see Validator

      ManagedConnectionFactoryDeploymentGroup group = elem.getValue();
      return group;
   }
   public static ManagedConnectionFactoryDeploymentGroup unmarshalResource(String resourceName) throws Exception
   {
      JAXBContext ctx = JAXBContext.newInstance(CTX_CLASS);
      Unmarshaller um = ctx.createUnmarshaller();
      Document d = getDocumentForResource(resourceName);
      JAXBElement<ManagedConnectionFactoryDeploymentGroup> elem = um.unmarshal(d, ManagedConnectionFactoryDeploymentGroup.class);
      ManagedConnectionFactoryDeploymentGroup group = elem.getValue();
      //      ManagedConnectionFactoryDeploymentGroup group = elem.getValue();
      return group;

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   {
      if (log.isTraceEnabled())
      {
         log.trace("saveMetadata, metadataStore="+metadataStore+ ", metadata="+metadata);
      }
      JAXBContext ctx = JAXBContext.newInstance(metadata.getClass());
      Marshaller marshaller = ctx.createMarshaller();
      marshaller.setProperty("jaxb.formatted.output", Boolean.TRUE);
      marshaller.marshal(metadata, metadataStore);
   }

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         else if(logTrace)
            log.trace("property not found: " + tempProp.getName());
      }


      Class[] classes = {ManagedConnectionFactoryDeploymentGroup.class};
      JAXBContext context = JAXBContext.newInstance(classes);      
      Marshaller marshaller = context.createMarshaller();
      marshaller.setProperty("jaxb.formatted.output", Boolean.TRUE);


      JAXBElement<ManagedConnectionFactoryDeploymentGroup> root =
            new JAXBElement<ManagedConnectionFactoryDeploymentGroup>(
                  new javax.xml.namespace.QName(rootElementName),

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   @SuppressWarnings("unchecked")
   protected <T> T loadAttachment(File attachmentsStore, Class<T> expected) throws Exception
   {
      if(log.isTraceEnabled())
         log.trace("loadAttachment, attachmentsStore=" + attachmentsStore);
      JAXBContext ctx = JAXBContext.newInstance(expected);
      Unmarshaller unmarshaller = ctx.createUnmarshaller();
      InputStream is = new FileInputStream(attachmentsStore);
      try
      {
         return (T) unmarshaller.unmarshal(is);
      }

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   protected void saveAttachment(File attachmentsStore, Object attachment) throws Exception
   {
      if(log.isTraceEnabled())
         log.trace("saveAttachment, attachmentsStore="+attachmentsStore+ ", attachment="+attachment);
      JAXBContext ctx = JAXBContext.newInstance(attachment.getClass());
      Marshaller marshaller = ctx.createMarshaller();
      marshaller.setProperty("jaxb.formatted.output", Boolean.TRUE);
      OutputStream os = new FileOutputStream(attachmentsStore);
      try
      {
         marshaller.marshal(attachment, os);

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         topic.setBindings(bindings);
      }
      else
         throw new IllegalStateException("Unsupported destination type: " + destinationType);


      JAXBContext context = JAXBContext.newInstance(JAXBJMSConfiguration.class);
      Marshaller marshaller = context.createMarshaller();
      marshaller.setProperty("jaxb.formatted.output", Boolean.TRUE);


      JAXBElement<JAXBJMSConfiguration> root = new JAXBElement<JAXBJMSConfiguration>(
            new javax.xml.namespace.QName("urn:hornetq", "configuration"), JAXBJMSConfiguration.class, null, config);

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         // I'm testing unknown content-length here
         GetMethod method = new GetMethod("http://localhost:8080/resteasy/xml");
         int status = client.executeMethod(method);
         Assert.assertEquals(HttpResponseCodes.SC_OK, status);
         String result = method.getResponseBodyAsString();
         JAXBContext ctx = JAXBContext.newInstance(Customer.class);
         Customer cust = (Customer) ctx.createUnmarshaller().unmarshal(new StringReader(result));
         Assert.assertEquals("Bill Burke", cust.getName());
         method.releaseConnection();
      }


   }

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      input.setSystemId(url.toURI().toString());
      XMLReader reader = XMLReaderFactory.createXMLReader();
      reader.setEntityResolver(new JBossEntityResolver());
      SAXSource source = new SAXSource(reader, input);
      // New JAXB context
      JAXBContext context = JAXBContext.newInstance(ManagedConnectionFactoryDeploymentGroup.class);
      Unmarshaller um = context.createUnmarshaller();
      // Unmarshal
      JAXBElement<ManagedConnectionFactoryDeploymentGroup> elem = um.unmarshal(source,
            ManagedConnectionFactoryDeploymentGroup.class);
      return elem.getValue();
   }

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      return deserialize(f);      
   }
   
   protected void serialize(PersistenceRoot moElement, File file) throws Exception
   {
      JAXBContext ctx = JAXBContext.newInstance(PersistenceRoot.class);
      Marshaller marshaller = ctx.createMarshaller();
      marshaller.setProperty("jaxb.formatted.output", Boolean.TRUE);
      marshaller.marshal(moElement, file);
      marshaller.marshal(moElement, System.out);
   }

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      marshaller.marshal(moElement, System.out);
   }
   
   protected PersistenceRoot deserialize(File file) throws Exception
   {
      JAXBContext ctx = JAXBContext.newInstance(PersistenceRoot.class);
      Unmarshaller unmarshaller = ctx.createUnmarshaller();
      return (PersistenceRoot) unmarshaller.unmarshal(file);
   }

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