Regarding DocumentBuilder.parse method returns reference as null value.
Hi
We are in the process of migrating code which works on WebSphere/JBOSS to WLS..
We are using DocumentBuilder object for parsing the Locale related xml data. I understand that the DocumentBuilder is provided by DocumentBuilderFactory which is an interface whose implementation is server specific.
But when the Document Builder parse method is called with a valid file path, we are getting System.Out of doc.getFirstChild().getLocalName() as null (which ideally should have been the name of the first node). No Errors are observed .
For WLS, the parser is giving the document object reference as null whereas in other servers like Websphere and JBOSS we are able to parse the same xml with proper object reference.
Could you please help in this regard?
Thanks and regards
Anil
Hi Vmotamar,
If you think that the parsers available as part of WebLogic are causing the issues, Then you can use your Own Parsers while migrating to WebLogic Server. I mean Get the Parser Jar files which u used as part of JBoss or WebSphere and put it inside the "APP-INF\lib" directory of your EAR Application or Put them inside "WEB-INF\lib" of your WEBApplication...and then Apply ClassLoader Filtering feature provided by WebLogic ...which allows an application to use It's Own Jars\Classes ...
Please refer to: http://forums.oracle.com/forums/thread.jspa?threadID=1109267&tstart=150 and in http://weblogic-wonders.com/weblogic/parsers_issues
Thanks
Jay SenSharma
http://weblogic-wonders.com/weblogic/parsers_issues/ (WebLogic Wonders Are Here)
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// A file that didn't match, or a weirdo (e.g. UNIX device file?).
return false;
/** Set the printable description of this filter. */
public void setDescription(String s) {
description = s;
/** Return the printable description of this filter. */
public String getDescription() {
return description;
private static class MyErrorHandler implements ErrorHandler {
// Error handler output goes here
private PrintStream out;
MyErrorHandler(PrintStream out) {
this.out = out;
* Returns a string describing parse exception details
private String getParseExceptionInfo(SAXParseException spe) {
String systemId = spe.getSystemId();
if (systemId == null) {
systemId = "null";
String info = "URI=" + systemId +
" Line=" + spe.getLineNumber() +
": " + spe.getMessage();
return info;
// The following methods are standard SAX ErrorHandler methods.
// See SAX documentation for more info.
public void warning(SAXParseException spe) throws SAXException {
//System.exit(0);
//out.println("Warning: " + getParseExceptionInfo(spe));
public void error(SAXParseException spe) throws SAXException {
//System.exit(0);
String message = "Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);
public void fatalError(SAXParseException spe) throws SAXException {
//System.exit(0);
String message = "Fatal Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);
public static void main(String[] av) {
JFrame vframe = new JFrame("chose files to pars");
boolean vverabreiten = true;
boolean validate = true;
JFileChooserrv vdateienwaehlen = new JFileChooserrv(vframe, vverabreiten);
}The Stack Trace i posted in the last Message. But i couldn't read it, i am not a programmer. -
I am trying to to parse a file using DocumentBuilder. The parse() method hangs for no reason. There are no errors or exceptions thrown. I even used a StringReader but in vain. Pl see code below:
The file is read correctly and i could even print the XML string out.
System.out.println("Parsing XML file from performParsing():" +s);
Document doc = null;
DocumentBuilderFactory factory = null;
DocumentBuilder builder = null;
try{
factory = DocumentBuilderFactory.newInstance();
System.out.println("Parsing XML factory:" +factory);
builder = factory.newDocumentBuilder();
System.out.println("Parsing XML builder:" +builder);
URL url = new URL(s);
URLConnection urlConnection = url.openConnection();
InputStream in = urlConnection.getInputStream();
String XMLStr = getStringReaderFromFile(in); //private method that gives a string
StringReader stReader = new StringReader(XMLStr);
InputSource ins = new InputSource(stReader);
doc = builder.parse(ins);--->IT HANGS HERENot an expert on this but presumably you have the properties set up correctly.
From javadoc ...
DocumentBuilderFactory uses the system property javax.xml.parsers.XmlDocumentParserFactory to find the class to load. So you can change the parser by calling:
System.setProperty("javax.xml.parsers.XmlDocumentParserFactory",
"com.foo.myFactory"); -
Possible to overwrite parse method in DOM with SAX Handler?
Hi,
Is it possible to overwrite the parse method within DOM?
What a want to do is:
private Node parseXml( String text ) throws SAXParseException, SAXException, IOException, ParserConfigurationException
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
SAXParser parser = factory.newSAXParser();
TestHandler handler = new TestHandler();
// Parse the file
parser.parse(new InputSource(new StringReader(text)), handler);
return (Node)handler.getRoot();
} //end parseXml()The reason I want to use this is that within SAX I can write my own line counter so I keep a count of which node is on which line of text.
What I was thinking is that I could use SAX to return DOM Nodes with the line number attached, possibly using the node.setUserData() method?!
I have tried to play around with it and it doen't seem to work, can anyone help?
Cheers AlexI have managaed to re-write my SAX parser to create a JTree, this works perfectly I can move through the tree and each line of text that corresponds to the node is highlighted.
My problem is however that in my application I have used the DOM structure throughout so some of the functionality is lost.
Is I understand that JAXP uses both SAX and DOM together, so I was wondering if it is possible to combine my sax parse method within the DOM?
If anything is unclear please say and I will try and explain better. The main reason for doing this is that I want to keep a reference to which line of text each node of the dom tree represents. I have not been able to implemnet one in DOM however using SAX I have managed.
Many thanks,
Alex
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