 | | | Serialization giving probem with HashMap | Serialization giving probem with HashMap 2003-05-02 - By peter peter
Hi, I am creating a new document and could serialize it without fail. But if
I add the created document to the HashMap. and then get the document from
hashMap and try to serialize, OutputFormat throws NullPointerException, Here's
the exception message--- /*java.lang.NullPointerException
at org.apache.xml.serialize.OutputFormat.whichMethod(Unknown Source)
at org.apache.xml.serialize.OutputFormat.<init>(Unknown Source)*/ Here
's the code I am using---> HashMap documentsMap = new HashMap();
Document doc= new DocumentImpl();
Element root = doc.createElement("person"); // Create Root Element
Element item = doc.createElement("name"); // Create element
item.appendChild( doc.createTextNode("Jeff") );
root.appendChild( item ); // Attach another Element -
doc.appendChild( root ); // Add Root to Document//add to
the HashMap....
documentsMap.put("node1",doc );
try
{
Iterator iterator = documentsMap.entrySet().iterator();
while (iterator.hasNext() )
{
Object key = iterator.next();
doc= (Document)taxonomyNodesMap.get(key);
OutputFormat format = new OutputFormat( doc ); //Serialize DOM
StringWriter stringOut = new StringWriter(); //Writer will be a
XMLSerializer serial = new XMLSerializer( stringOut, format );
serial.asDOMSerializer(); // As a DOM Serializer
serial.serialize( doc.getDocumentElement());
}
}catch...... Any help will be greatly appreciated.. Regards,Peter
---------------------------------
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<DIV>Hi,</DIV>
<DIV> I am creating a new document and could serialize it
without fail.</DIV>
<DIV> </DIV>
<DIV> But if I add the created document to the HashMap.
and then get the document from hashMap and try to serialize, 
;OutputFormat throws NullPointerException,</DIV>
<DIV> </DIV>
<DIV>Here's the exception message---</DIV>
<DIV> </DIV>
<DIV>/*</DIV>
<DIV>java.lang.NullPointerException<BR>
at org.apache.xml.serialize.OutputFormat.whichMethod(Unknown Source)<BR>
at org.apache.xml.serialize
.OutputFormat.<init>(Unknown Source)*/</DIV>
<DIV> </DIV>
<DIV>Here's the code I am using---></DIV>
<DIV> </DIV>
<DIV> HashMap documentsMap = new HashMap();<BR> Document doc= new
DocumentImpl();<BR> Element root = doc.createElement("person");  
; // Create Root Element<BR> Element item = doc.createElement(
"name"); // Create element<BR> item
.appendChild( doc.createTextNode("Jeff") ); <BR> root.appendChild( item );
// Attach another Element
- doc.appendChild( root );  
;
// Add Root to Document</DIV>
<DIV>//add to the HashMap....<BR>documentsMap.put("node1",doc );<BR>  
;try<BR> {<BR> Iterator iterator = documentsMap
.entrySet().iterator();<BR> while (iterator.hasNext() )<BR>
{<BR> Object key = iterator.next
();<BR> doc= (Document)taxonomyNodesMap.get(key);
<BR> OutputFormat format = new OutputFormat(
doc ); //Serialize DOM<BR>  
;StringWriter stringOut = new StringWriter();  
; //Writer will be a </DIV>
<DIV> XMLSerializer serial = new
XMLSerializer( stringOut, format );<BR> serial
.asDOMSerializer();
// As a DOM Serializer<BR>  
;serial.serialize( doc.getDocumentElement());<BR> }<BR>
}catch......</DIV>
<DIV> </DIV>
<DIV>Any help will be greatly appreciated..</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV>Peter</DIV><BR><BR><p><hr SIZE=1>
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