Databases
StackOverflow2013
Postsdbo
POParsing XML using java DOM
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POParsing XML using java DOM
    primarykey
    data
    text
    <p>Im new in Java, and i have a task to Parse one xml file using http with current url <a href="http://belbooner.site40.net/testXmls/details.xml" rel="nofollow">http://belbooner.site40.net/testXmls/details.xml</a></p> <p>I created Some class to parse it using Dom method, but im having java.lang.NullPointerException while trying to get one Nodes value So here's the code</p> <pre><code>import java.security.KeyStore.Builder; import java.util.*; import java.io.*; import java.net.*; import javax.swing.text.Document; import javax.xml.*; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.w3c.dom.*; import org.w3c.dom.CharacterData; import org.xml.sax.InputSource; import org.xml.sax.SAXException; public class RequestResponse { public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException { URL url = new URL("http://belbooner.site40.net/testXmls/details.xml"); RequestResponse req= new RequestResponse(); req.getHTTPXml(url); } void getHTTPXml(URL url) throws ParserConfigurationException, IOException, SAXException { //URL url = new URL("http://belbooner.site40.net/testXmls/details.xml"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("ACCEPT","application/xml"); InputStream xml = conn.getInputStream(); DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); org.w3c.dom.Document document = builder.parse(xml); System.out.println(document); String doctype = conn.getContentType(); System.out.print(doctype); NodeList root = document.getChildNodes(); Node server = getNodes("server",root); Node check = getNodes("check", server.getChildNodes()); NodeList nodes = check.getChildNodes(); String checkid= getNodeValue("checkid", nodes); System.out.println(checkid); conn.disconnect(); //return (Document) DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xml); } Node getNodes(String tagName, NodeList nodes) { for(int i=0; i&lt; nodes.getLength();i++) { Node node= nodes.item(i); if(node.getNodeName().equalsIgnoreCase(tagName)) { return node; } } return null; } String getNodeValue(String tagName, NodeList nodes ) { for ( int i = 0; i &lt; nodes.getLength(); i++ ) { Node node = nodes.item(i); if (node.getNodeName().equalsIgnoreCase(tagName)) { NodeList childNodes = node.getChildNodes(); for (int y = 0; y &lt; childNodes.getLength(); y++ ) { Node data = childNodes.item(y); if ( data.getNodeType() == Node.TEXT_NODE ) { return data.getNodeValue(); } if(data instanceof CharacterData) { CharacterData cd= (CharacterData) data; return cd.getData(); } } } } return ""; } } </code></pre> <p>The stacktrace I'm getting is the following:</p> <pre><code>application/xmlException in thread "main" java.lang.NullPointerException at RequestResponse.getHTTPXml(RequestResponse.java:45) at RequestResponse.main(RequestResponse.java:22) </code></pre> <p>After changin <code>Node server = getNodes("server",root);</code> to `</p> <pre><code> Node resultNode = getNodes("result", root); Node server = getNodes("server", resultNode.getChildNodes());` `application/xmlException in thread "main" java.lang.NullPointerException at RequestResponse.getHTTPXml(RequestResponse.java:49) at RequestResponse.main(RequestResponse.java:22) ` </code></pre> <p>Please help me to find the issue. </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USArshak92
    1. USArshak92
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POParsing XML using java DOM
      1. USMurali Prasanth
      1. VTFavorite
    2. VO
      singulars
      1. POParsing XML using java DOM
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POParsing XML using java DOM
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIt would be helpful if you could include the stacktrace of the NullPointerException in the question.
      singulars
      1. POParsing XML using java DOM
      1. USHenrik
    2. COcould you share the line where you are getting the null pointer
      singulars
      1. POParsing XML using java DOM
      1. USNarendra Pathai
    3. COapplication/xmlException in thread "main" java.lang.NullPointerException at RequestResponse.getHTTPXml(RequestResponse.java:45) at RequestResponse.main(RequestResponse.java:22)
      singulars
      1. POParsing XML using java DOM
      1. USArshak92
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload