Exception while replacing an XML tag in an XML file

[Devarakonda Srikanth]

Hi,

When I am trying to replace the existing XML tag with other one I am getting the following exception:

org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
at org.apache.xerces.dom.ParentNode.internalInsertBefore(Unknown Source)
at org.apache.xerces.dom.ParentNode.replaceChild(Unknown Source)
at org.apache.xerces.dom.CoreDocumentImpl.replaceChild(Unknown Source)
at com.Replace_Tag.replaceNode(Replace_Tag.java:97)
at com.Replace_Tag.processRequest(Replace_Tag.java:39)
at com.Replace_Tag.doGet(Replace_Tag.java:56)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

The following is the code I am using :


code:
--------------------------------------------------------------------------------

public void replaceNode() throws Exception{ DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse("file:/C:/Documents and Settings/srikanth.d.KNOAHSOFT/Desktop/Linechart.jrxml"); Element root = doc.getDocumentElement(); Element newElement = doc.createElement("stackedBarchart"); NodeList oldList = root.getElementsByTagName("lineChart"); int length = oldList.getLength(); System.out.println("length::"+length); for(int i=0;i<length;i++) { Node oldNode = oldList.item(i); NodeList nl = doc.getChildNodes(); newElement.getTagName().toString()); (i).getNodeName().toString()); doc.replaceChild((Node)newElement, oldNode); } }

--------------------------------------------------------------------------------





Can anybody help me in this regard...

Thanks and Regards
DNV Srikanth

[Ben Souther]

This seems to be more XML related than Servlet related.
Moving to our XML forum.

[Devarakonda Srikanth]

can anybody help in this regard...

[William Brogden]

The next time you need help with code, kindly format it so it can be read.

I suspect your problem is due to the oldNode and newNode not being in the same Document context. At least thats what the Java 1.5 JavaDocs for org.w3c.dom.Node indicate.

Bill

[Devarakonda Srikanth]

I am trying to do the above said task in the same document context... i am giving the content xml file also:

    
<?xml version="1.0" encoding="UTF-8"  ?>
<!-- Created with iReport - A designer for JasperReports -->
<!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN" "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport
 name="Line chart"
 columnCount="1"
 printOrder="Vertical"
 orientation="Portrait"
 pageWidth="396"
 pageHeight="842"
 columnWidth="396"
 columnSpacing="0"
 leftMargin="0"
 rightMargin="0"
 topMargin="0"
 bottomMargin="0"
 whenNoDataType="NoPages"
 isTitleNewPage="false"
 isSummaryNewPage="false">
<property name="ireport.scriptlethandling" value="2" />
<property name="ireport.encoding" value="UTF-8" />
<import value="java.util.*" />
<import value="net.sf.jasperreports.engine.*" />
<import value="net.sf.jasperreports.engine.data.*" />
 
<queryString><![CDATA[select * from evalsubcomparison where qacount1 between 70.0 and 75.0]]></queryString>
 
<field name="EmpId" class="java.lang.Double"/>
<field name="Empname" class="java.lang.String"/>
<field name="BaseEmpId" class="java.lang.Double"/>
<field name="QACount1" class="java.lang.Double"/>
<field name="WeekId1" class="java.lang.String"/>
<field name="QACount2" class="java.lang.Double"/>
<field name="WeekId" class="java.lang.String"/>
<field name="QACount3" class="java.lang.Double"/>
<field name="WeekId3" class="java.lang.String"/>
<field name="QACount4" class="java.lang.Double"/>
<field name="WeekId4" class="java.lang.String"/>
<field name="level" class="java.lang.Double"/>
 
<background>
<band height="0"  isSplitAllowed="true" >
</band>
</background>
<title>
<band height="0"  isSplitAllowed="true" >
</band>
</title>
<pageHeader>
<band height="0"  isSplitAllowed="true" >
</band>
</pageHeader>
<columnHeader>
<band height="0"  isSplitAllowed="true" >
</band>
</columnHeader>
<detail>
<band height="0"  isSplitAllowed="true" >
</band>
</detail>
<columnFooter>
<band height="0"  isSplitAllowed="true" >
</band>
</columnFooter>
<pageFooter>
<band height="0"  isSplitAllowed="true" >
</band>
</pageFooter>
<summary>
<band height="301"  isSplitAllowed="true" >
<lineChart>
<chart  hyperlinkTarget="Self" >
<reportElement
mode="Opaque"
x="0"
y="0"
width="390"
height="300"
backcolor="#FFFFFF"
key="element-1"/>
<box topBorder="None" topBorderColor="#000000" leftBorder="None" leftBorderColor="#000000" rightBorder="None" rightBorderColor="#000000" bottomBorder="None" bottomBorderColor="#000000"/>
<chartLegend textColor="#000000" backgroundColor="#FFFFFF" >
<font fontName="Times New Roman" pdfFontName="Helvetica" size="10" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false" isPdfEmbedded="false" pdfEncoding="Cp1252"/>
</chartLegend>
</chart>
<categoryDataset>
<dataset >
</dataset>
<categorySeries>
<seriesExpression><![CDATA["WE "+$F{WeekId1}]]></seriesExpression>
<categoryExpression><![CDATA[$F{Empname}]]></categoryExpression>
<valueExpression><![CDATA[$F{QACount1}]]></valueExpression>
<itemHyperlink >
</itemHyperlink>
</categorySeries>
<categorySeries>
<seriesExpression><![CDATA["WE "+$F{WeekId}]]></seriesExpression>
<categoryExpression><![CDATA[$F{Empname}]]></categoryExpression>
<valueExpression><![CDATA[$F{QACount2}]]></valueExpression>
<itemHyperlink >
</itemHyperlink>
</categorySeries>
<categorySeries>
<seriesExpression><![CDATA["WE "+$F{WeekId3}]]></seriesExpression>
<categoryExpression><![CDATA[$F{Empname}]]></categoryExpression>
<valueExpression><![CDATA[$F{QACount3}]]></valueExpression>
<itemHyperlink >
</itemHyperlink>
</categorySeries>
<categorySeries>
<seriesExpression><![CDATA["WE "+$F{WeekId4}]]></seriesExpression>
<categoryExpression><![CDATA[$F{Empname}]]></categoryExpression>
<valueExpression><![CDATA[$F{QACount4}]]></valueExpression>
<itemHyperlink >
</itemHyperlink>
</categorySeries>
</categoryDataset>
<linePlot >
<plot backcolor="#FFFFFF" />
<categoryAxisFormat>
<axisFormat >
</axisFormat>
</categoryAxisFormat>
<valueAxisLabelExpression><![CDATA["No. of Evaluations"]]></valueAxisLabelExpression>
<valueAxisFormat>
<axisFormat >
<labelFont>
<font fontName="Serif" pdfFontName="Helvetica" size="14" isBold="false" isItalic="true" isUnderline="false" isStrikeThrough="false" isPdfEmbedded="false" pdfEncoding="Cp1252"/>
</labelFont>
<tickLabelFont>
</tickLabelFont>
</axisFormat>
</valueAxisFormat>
</linePlot>
</lineChart>
</band>
</summary>
</jasperReport>
 

[Paul Clapham]

I had to read the API documentation, to see what exceptions that method could throw and what they meant. And here's what it says your exception means:

NOT_FOUND_ERR: Raised if oldChild is not a child of this node.

So, you should be calling that method on the parent of the oldChild node and not on the document element.

[Devarakonda Srikanth]

Hi
I have done the corresponding changes to replace the node. Here I am giving the source code I have changed. When I execute another exception is being encountered. Here is the code:

    
public void replaceNode() throws Exception{
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse("file:/C:/Documents and Settings/srikanth.d.KNOAHSOFT/Desktop/Linechart.jrxml");
System.out.println("File Parsed");        
        Element root = doc.getDocumentElement();
System.out.println("Got the elements into the DOM object");                
        Element newElement = doc.createElement("stackedBarchart");
System.out.println("The new element created is:" + newElement.getTagName().toString());        
        NodeList oldList = root.getElementsByTagName("summary");
        int length = oldList.getLength();
        for(int i=0;i<length;i++){
            Node node = oldList.item(i).getFirstChild();
            node.replaceChild(newElement, node);
        }
    }

and the exception is:

org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted.
at org.apache.xerces.dom.NodeImpl.replaceChild(Unknown Source)
at com.Replace_Tag.replaceNode(Replace_Tag.java:92)
at com.Replace_Tag.processRequest(Replace_Tag.java:39)
at com.Replace_Tag.doGet(Replace_Tag.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)


Can you please provide the solution for this...If the code written is wrong, can anyone provide a code snippet to replace an existing tag with another one in an XML file...

Thanks and Regards

[William Brogden]

Node node = oldList.item(i).getFirstChild();

Tch! I suspect that first child is a Text node instead of the Element you expect. Naturally a Text node is not legal for the replaceChild operation.

Bill

[Paul Clapham]

Actually this code

node.replaceChild(newElement, node);

isn't any better because "node" isn't the parent of "node" either. I don't think you meant to do that, but your choice of meaningless variable names led you into that error.

Doesn't the DOM have a getParent() method? If so, go back to your original code and apply that method.

[Devarakonda Srikanth]

Thanq Ranchers its working :thumb:

[Devarakonda Srikanth]

[ August 29, 2007: Message edited by: Paul Clapham ]

[Paul Clapham]

Glad it's working.

(We have smilies disabled by default in this forum because XML with namespaces turns into a mess of smilies. But I edited your last post to enable smilies, to reflect what you really meant.)