Sizing DOM trees created by Oracle Java XML parser (v2)

Hello,
Has anyone seen/got any formulas that can be used to calculate the DOM tree memory requirements for a given XML document.
My team has developed some software that, acts like an XSLT, and it runs out of memory for bigger documents. I am able to allocate more memory (usuing java -Xmx<larger figure>) to the process but it would be nice to go to my team leader and say that a file of a given structure would require so much memory.
At the moment, we are guessing and using the Runtime.getRuntime().freeMemory() and Runtime.getRuntime().TotalMemory()
to provide some very rough estimates.
XSLTs wouldnt be able to do what we want. If I could give the team leader some figures then he may be able to justify converting the code to use JDOM instead of a DOM tree.
Thanks in Advance.
Mark Robbins

Can you paste your java code here ? I assume, you must have tried type-casting.

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at
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This bug has already been reported and will be fixed in our next
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Oracle XML Team
http://technet.oracle.com
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Fiona Lu (guest) wrote:
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which
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XMLTYPE xml ="
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Consider this example
--- Test.java -----
import java.io.*;
import javax.xml.transform.sax.SAXSource;
import net.sf.saxon.sxpath.*;
import oracle.xml.parser.v2.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;
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try {
DOMParser domParser = new DOMParser();
domParser.parse(new FileReader("test.xml"));
XMLDocument document = domParser.getDocument();
InputSource is = new InputSource(new File("test.xml").toURL().toString());
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testXPathOracle(document,"name(/root)");
testXPathOracle(document,"/*/name()");
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testXPathSaxon(source,"/*/name()");
} catch(Exception e) {
System.out.println(e.getMessage());
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System.out.println(node.getNodeValue());
} catch(Exception e) {
System.out.println(e.getMessage());
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XPathExpression exp = xpe.createExpression(xpath);
Object object = exp.evaluateSingle(source);
System.out.println(object);
} catch(Exception e) {
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--- test.xml -----
<root>
<element/>
</root>
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Unknown expression at EOF: (name(/*))[1].
Unknown expression at EOF: (name(/root))[1].
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2
root
root
root
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I found the solution:
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CLASS STATUS
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i have an xml sturcture as shown below:
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
<cnv:roottag support="yes" destag="xfw:script">
<cnv:addattr name="debug" value="no" />
<cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
</cnv:roottag>
<xsql:query support="yes" destag="xfw:genxml">
<connection support="no" />
<row-element support="yes" destag="row-name" />
<rowset-element support="yes" destag="rowset-name" />
<id-attribute support="no" />
<tag-case support="no" />
<null-indicator support="no" />
<cnv:addattr name="debug" value="yes" />
<cnv:addattr name="Attribute1" value="Value1" />
</xsql:query>
<xsql:no-rows-query support="no" child="no" />
<responsedata support="no" child="yes" />
<responsedata2 support="no" child="yes" />
<page destag="page1" support="yes">
<connection support="no" /> <debug destag="MyDebug" />
<cnv:addattr name="tt" value="t1" />
</page>
<xsql:set-page-param support="yes" destag="setpageparam">
<name destag="myname" />
</xsql:set-page-param>
<xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
<name destag="mylocalname" />
</xsql:set-page-param-local>
</cnv:conversion>
I want this xml to be validated by the dom parser which i had done and its showing it as valid XML.
If there are any repeating tags like:
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
<cnv:roottag support="yes" destag="xfw:script">
<cnv:addattr name="debug" value="no" />
<cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
</cnv:roottag>
<xsql:query support="yes" destag="xfw:genxml">
<connection support="no" />
<row-element support="yes" destag="row-name" />
<rowset-element support="yes" destag="rowset-name" />
<id-attribute support="no" />
<tag-case support="no" />
<null-indicator support="no" />
<cnv:addattr name="debug" value="yes" />
<cnv:addattr name="Attribute1" value="Value1" />
</xsql:query>
<xsql:no-rows-query support="no" child="no" />
<responsedata support="no" child="yes" />
<responsedata2 support="no" child="yes" />
<page destag="page1" support="yes">
<connection support="no" /> <debug destag="MyDebug" />
<cnv:addattr name="tt" value="t1" />
</page>
<xsql:set-page-param support="yes" destag="setpageparam">
<name destag="myname" />
</xsql:set-page-param>
<xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
<name destag="mylocalname" />
</xsql:set-page-param-local>
</cnv:conversion>
</cnv:conversion>
or like this....................
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
<cnv:roottag support="yes" destag="xfw:script">
<cnv:addattr name="debug" value="no" />
<cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
</cnv:roottag>
<cnv:roottag support="yes" destag="xfw:script">
<cnv:addattr name="debug" value="no" />
<cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
</cnv:roottag>
<xsql:query support="yes" destag="xfw:genxml">
<connection support="no" />
<row-element support="yes" destag="row-name" />
<rowset-element support="yes" destag="rowset-name" />
<id-attribute support="no" />
<tag-case support="no" />
<null-indicator support="no" />
<cnv:addattr name="debug" value="yes" />
<cnv:addattr name="Attribute1" value="Value1" />
</xsql:query>
<xsql:no-rows-query support="no" child="no" />
<responsedata support="no" child="yes" />
<responsedata2 support="no" child="yes" />
<page destag="page1" support="yes">
<connection support="no" /> <debug destag="MyDebug" />
<cnv:addattr name="tt" value="t1" />
</page>
<xsql:set-page-param support="yes" destag="setpageparam">
<name destag="myname" />
</xsql:set-page-param>
<xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
<name destag="mylocalname" />
</xsql:set-page-param-local>
</cnv:conversion>
My java code is shown below :
import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.*;
public class sample2
public void processXML(String path)
File docFile=new File(path);
Document doc=null;
try
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance(); DocumentBuilder db=dbf.newDocumentBuilder();
doc=db.parse(docFile);
catch(IOException ioe)
System.out.println("cant find file");
catch(Exception e)
System.out.println("Error has occured");
Element root=doc.getDocumentElement();
NodeList children=root.getChildNodes();
StringBuffer sbuf=new StringBuffer();
for(Node child=root.getFirstChild(); child!=null; child=child.getNextSibling())
if(child.getNodeType()==child.TEXT_NODE) sbuf.append(child.getNodeValue()) ;
else if(child.getNodeType()==child.ELEMENT_NODE) if(child.getChildNodes()!=null)
getnodes(child, sbuf);
public void getnodes(Node Child, StringBuffer sbf)
NodeList children=Child.getChildNodes();
if(children.getLength() > 0)
System.out.println(children.getLength() + Child.getNodeName());
for(Node child=Child.getFirstChild(); child!=null;child=child.getNextSibling())
if(child.getNodeType()==child.TEXT_NODE) sbf.append((child.getNodeValue()).trim());
else if(child.getNodeType()==child.ELEMENT_NODE)
if(child.getChildNodes()!=null)
getnodes(child, sbf); sbf.append(";");
public static void main(String[] args)
testxml txml=new testxml();
txml.processXML("E:\\Naresh\\conversion_fxsql.xml");
can any body tell me how to validate the repeating tags (as i dont have dtd for this xml )with the given code.... if any one of the tags are repeating it should raise an exception thats its not a valid xml
Thanks in advance
Regards
Bunny

I suggest you create a DTD or a XSD file to validate your existing XML document, because it's easier that i looks, and will help in future changes.
If you want to do it in Java code, you can always store each line of the XML file in some form (like a class) in a List, and the each time you read a line, you compare with everything on the list.
But don't go that way, make a XSD file

JAVA XML Parsing

i have an xml sturcture as shown below:
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
     <cnv:roottag support="yes" destag="xfw:script">
          <cnv:addattr name="debug" value="no" />
          <cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
     </cnv:roottag>
     <xsql:query support="yes" destag="xfw:genxml">
          <connection support="no" />
          <row-element support="yes" destag="row-name" />
          <rowset-element support="yes" destag="rowset-name" />
          <id-attribute support="no" />
          <tag-case support="no" />
          <null-indicator support="no" />
          <cnv:addattr name="debug" value="yes" />
          <cnv:addattr name="Attribute1" value="Value1" />
     </xsql:query>
     <xsql:no-rows-query support="no" child="no" />
     <responsedata support="no" child="yes" />
     <responsedata2 support="no" child="yes" />
     <page destag="page1" support="yes">
          <connection support="no" /> <debug destag="MyDebug" />
          <cnv:addattr name="tt" value="t1" />
     </page>
     <xsql:set-page-param support="yes" destag="setpageparam">
          <name destag="myname" />
     </xsql:set-page-param>
     <xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
          <name destag="mylocalname" />
     </xsql:set-page-param-local>
</cnv:conversion>
I want this xml to be validated by the dom parser which i had done and its showing it as valid XML.
If there are any repeating tags like:
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
     <cnv:roottag support="yes" destag="xfw:script">
          <cnv:addattr name="debug" value="no" />
          <cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
     </cnv:roottag>
     <xsql:query support="yes" destag="xfw:genxml">
          <connection support="no" />
          <row-element support="yes" destag="row-name" />
          <rowset-element support="yes" destag="rowset-name" />
          <id-attribute support="no" />
          <tag-case support="no" />
          <null-indicator support="no" />
          <cnv:addattr name="debug" value="yes" />
          <cnv:addattr name="Attribute1" value="Value1" />
     </xsql:query>
     <xsql:no-rows-query support="no" child="no" />
     <responsedata support="no" child="yes" />
     <responsedata2 support="no" child="yes" />
     <page destag="page1" support="yes">
          <connection support="no" /> <debug destag="MyDebug" />
          <cnv:addattr name="tt" value="t1" />
     </page>
     <xsql:set-page-param support="yes" destag="setpageparam">
          <name destag="myname" />
     </xsql:set-page-param>
     <xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
          <name destag="mylocalname" />
     </xsql:set-page-param-local>
</cnv:conversion>
</cnv:conversion>
or like this....................
<cnv:conversion xmlns:cnv="urn:ssis-conv" xmlns:xsql="urn:oracle-xsql">
     <cnv:roottag support="yes" destag="xfw:script">
          <cnv:addattr name="debug" value="no" />
          <cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
     </cnv:roottag>
<cnv:roottag support="yes" destag="xfw:script">
          <cnv:addattr name="debug" value="no" />
          <cnv:addattr name="xmlns:xfw" value="urn:scb-xfw-v2" />
     </cnv:roottag>
     <xsql:query support="yes" destag="xfw:genxml">
          <connection support="no" />
          <row-element support="yes" destag="row-name" />
          <rowset-element support="yes" destag="rowset-name" />
          <id-attribute support="no" />
          <tag-case support="no" />
          <null-indicator support="no" />
          <cnv:addattr name="debug" value="yes" />
          <cnv:addattr name="Attribute1" value="Value1" />
     </xsql:query>
     <xsql:no-rows-query support="no" child="no" />
     <responsedata support="no" child="yes" />
     <responsedata2 support="no" child="yes" />
     <page destag="page1" support="yes">
          <connection support="no" /> <debug destag="MyDebug" />
          <cnv:addattr name="tt" value="t1" />
     </page>
     <xsql:set-page-param support="yes" destag="setpageparam">
          <name destag="myname" />
     </xsql:set-page-param>
     <xsql:set-page-param-local support="yes" destag="Myset-page-param-local">
          <name destag="mylocalname" />
     </xsql:set-page-param-local>
</cnv:conversion>
or any row is being repeated it not a valid XML....
my java code is :
My java code is shown below :
import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.*;
public class sample2
     public void processXML(String path)
          File docFile=new File(path);
          Document doc=null;
          try
               DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();                     DocumentBuilder db=dbf.newDocumentBuilder();
               doc=db.parse(docFile);
          catch(IOException ioe)
               System.out.println("cant find file");
          catch(Exception e)
               System.out.println("Error has occured");
          Element root=doc.getDocumentElement();
          NodeList children=root.getChildNodes();
          StringBuffer sbuf=new StringBuffer();
          for(Node child=root.getFirstChild(); child!=null; child=child.getNextSibling())
               if(child.getNodeType()==child.TEXT_NODE)                sbuf.append(child.getNodeValue()) ;
               else if(child.getNodeType()==child.ELEMENT_NODE)                if(child.getChildNodes()!=null)
               getnodes(child, sbuf);
public void getnodes(Node Child, StringBuffer sbf)
     NodeList children=Child.getChildNodes();
     if(children.getLength() > 0)
          System.out.println(children.getLength() + Child.getNodeName());
     for(Node child=Child.getFirstChild(); child!=null;child=child.getNextSibling())
          if(child.getNodeType()==child.TEXT_NODE) sbf.append((child.getNodeValue()).trim());
     else if(child.getNodeType()==child.ELEMENT_NODE)
     if(child.getChildNodes()!=null)
          getnodes(child, sbf); sbf.append(";");
public static void main(String[] args)
     testxml txml=new testxml(); txml.processXML("E:\\Naresh\\conversion_fxsql.xml");
can any body tell me how to validate the repeating tags with the given code.... if any one of the tags are repeating it should raise an exception thats its not a valid xml
Thanks in advance
Regards
Bunny

The first problem about this document is that it contains a space at the very first position whereas <?xml... must appear at the very beginning of a document. I think this was the cause of the parsing fault.
Also you have a dash before the root element of the document, which is illegal.

Best Way to Create Generic PL/SQL XML Parser

I have an application that stores xml documents in a table. For each product sold in the system, a different XML document can exist for custom data about that product.
The schemas are stored in another table and not with the xml document. I am looking for a way to parse the nodes at a minium and save the xml fragment for each node or possibly take each node and store each non-repeating elment in another table to make it easier for end users to query the data.
Any suggestions on how to address this?
Thanks

I've been testing XML DB (XMLType Tables and Columns) a few months ago with very good results, this might help. http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14259/xdb03usg.htm#BABDGDJG

Java + XML = parsing error

I am recieving this message when application is parsing an xml file, but only in specific cases which i can't determinate. Seems like xml file structure is the same in the cases when all is ok, and when i get that message below. I dont use any schema.
DefaultValidationEventHandler: [ERROR]: Unexpected element {}:ALRT
Location:
javax.xml.bind.UnmarshalException: Unexpected element {}:ALRT
My xml file structure in most occasions is like this:
<?xml version="1.0" encoding="UTF-8" ?>
- <SHOP_answer id="shop_response">
- <WAREHOUSE>
<Warehouse_client Id="C1">Gate</Warehouse_client>
<Warehouse_server Id="TS1">SHOP SERVER</Warehouse_server>
<Warehouse_transaction Id="0">Test</Warehouse_transaction>
<Warehouse_language Id="LV">Latvieshu</Warehouse_language>
<Warehouse_currency Id="EUR">Euro</Warehouse_currency>
</WAREHOUSE>
- <STORE>
- <ITM id="1">
- <GDS nbr="100">
<gds_descr>live animals</gds_descr>
<gds_ind>3</gds_ind>
</GDS>
- <LOC>
<loc_area_id>NL</loc_area_id>
<loc_area_descr>Nid</loc_area_descr>
</LOC>
- <EMA id="1">
<EMA_id code="3">ABC</EMA_id>
- <PRICE id="026">
- <Price_element>
<Price_b>0.42</Price_b>
<Price_r>0.418</Price_r>
<Price_a>0.18</Price_a>
<bee_code>271</bee_code>
</Price_element>
- <Price_element>
<Price_b>0.00</Price_b>
<Price_r>2.227</Price_r>
<Price_a>0.00</Price_a>
<bee_code>272</bee_code>
</Price_element>
</PRICE>
</EMA>
</ITM>
</STORE>
</SHOP_answer>

The first problem about this document is that it contains a space at the very first position whereas <?xml... must appear at the very beginning of a document. I think this was the cause of the parsing fault.
Also you have a dash before the root element of the document, which is illegal.

Java XML parsing with Xerces in Eclipse using Oxygen problem

Hey everybody,
Got me a stickler of a prob here and i'm hoping sum one out there will be able to help. I am trying to parse XML files into JDom objects so i can use them in the rest of my project with ease, but i'm having trouble parsing anything wihtout getting these errors
Error: URI = /filelocat/personal-schema.xml", Line = "3", : Document root element "personnel", must match DOCTYPE root "null".
Error: URI = /filelocat/personal-schema.xml", Line = "3", : Document is invalid: no grammar found.
Error: URI = /filelocat/personal-schema.xml", Line = "3", : cvc-complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'personnel'.
Error: URI = /filelocat/personal-schema.xml", Line = "3", : cvc-complex-type.3.2.2: Attribute 'xsi:noNamespaceSchemaLocation' is not allowed to appear in element 'personnel'.
The are the files are ones that come in Oxygens samples folder so they should be correct. The code is as follows
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          factory.setValidating(true);
SchemaFactory sFact = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");
Schema schema = sFact.newSchema(schemaFile);
factory.setSchema(schema);
DocumentBuilder dommer = factory.newDocumentBuilder();
Document doco = dommer.parse(xmlFile.getAbsolutePath());None of these errors appears to be fatal, i can still use the doco object and extract the information i require, but i want to understand where the errors are coming from. There must be a parser setting or sumthing i've missed somewhere.
Can anyone help?
Any ideas/surgestions/critique welcome.
Tom

When we are parsing this xml: "<CustomerInfo><VCID/>77888</CustomerInfo>".
See comments in following code.
Element docEle = d.getDocumentElement(); // Returns "CustomerInfo" element node.
NodeList childNodes2 = docEle.getChildNodes(); // Returns two nodes: <VCID/> element node and 77888 text node.
Node item4 = childNodes2.item( 0 ); // First node (element node) of the "CustomerInfo" tag. <VCID/>
Node item5 = childNodes2.item( 1 ); // Second node (text node) of the "CustomerInfo" tag is 77888. Look this text is not child of VCID, it's second child node of "CustomerInfo" tag.
NodeList childNodes3 = item4.getChildNodes(); // Returns null because <VCID/> node is empty.
String nodeValue = item5.getNodeValue(); // Returns 77888 ( text node ).               Regards,
Sławomir Wojtasiak

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