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Date: Wed, 13 Jun 2007 02:40:23 -0700 (PDT)
From: "Armin M. Garcia" <armin_garcia@yahoo.com>
Subject: betwixt - Hibernate - Lazy Initialization Exception
To: commons-user@jakarta.apache.org
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  I am using betwixt to marshal a domain object initialized from Hiberate.  Is there a way to generate a static (stub) XML element when a proxy object is detected?
 
 The domain object being considered is a node in an n-ary tree and therefore contains references to other child nodes.  I've declared the child relationship to be a list that is initialized lazily since not doing so will retrieve the whole graph causing a significant delay.  The lazy initialization creates a proxy used to retrieve the actual node if called in the context of a transaction.  Outside of a transaction, accessing the proxy will throw a Lazy Initialization Exception.
 
 I am taking this single node and writing it to XML.  The introspection returns a complete description of the root node being considered.  In addition, a descriptor for the list of child nodes is also returned.  At the time the bean is being written, the node attributes, in particular, the child nodes are interrogated.  The child nodes are clearly defined by a Hibernate proxy and therefore complain when the writer makes an effort to write the corresponding XML element for the list.
 
 Setting a class normalizer through 'setClassNormalizer' only captures the top level bean but not its attributes (ie. the list of child nodes).  
 
 Consider the following example:
 
 Node:
   ID = 1
   List<Node> children = (NodeProxy[ID=2], NodeProxy[ID=3])
 
 The xml I'm trying to accomplish would be like:
 
 <Node ID=1>
    <ChildNodes>
        <Proxy classOfChildNode="Node" childID='2">
        <Proxy classOfChildNode="Node" childID='3">
    </ChildNodes>
 </Node>
 
 Any ideas would be appreciated.
 
            -Armin

   
  
       
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