Check
SQL> DECLARE
   ctx INTEGER
         := dbms_xmlgen.newcontext (
               'select ''Jao'' "Name", 24 "Age", null "PhoneNumber" from dual '
BEGIN
   dbms_xmlgen.setnullhandling (ctx, dbms_xmlgen.empty_tag);
   dbms_output.put_line (dbms_xmlgen.getxml (ctx));
   dbms_xmlgen.closecontext (ctx);
END;
<?xml version="1.0"?>
<ROWSET>
<ROW>
<Name>Jao</Name>
<Age>24</Age>
<PhoneNumber/>
</ROW>
</ROWSET>
PL/SQL procedure successfully completed.

Similar Messages

Oracle XML functions return tags for null columns.

I am currently writing a SOAP Message base on a SQL statement formatted as XML. However, I am having problems with Oracle XML functions not returning tags for null columns as seen in my example below. Is the a way to get Oracle XML functions to return empty tags for null column?
CREATE TABLE FOREXAMPLE_TABLE (COLUMN_1 VARCHAR2 (4000),
COLUMN_2 VARCHAR2 (4000),
COLUMN_3 VARCHAR2 (4000));
INSERT INTO FOREXAMPLE_TABLE (COLUMN_2)
VALUES ('This column is not null');
COMMIT;
SELECT XMLELEMENT ( "soap:Envelope",
XMLATTRIBUTES ( 'http://schemas.xmlsoap.org/soap/envelope/' AS "xmlns:soap"),
XMLELEMENT ( "soap:Body",
XMLATTRIBUTES ( 'http://Custom_Column/types/' AS "xmlns:ns1"),
XMLELEMENT ( "ns1:New_Instance",
XMLELEMENT ( "ns1:Input_XMLDoc",
XMLFOREST(fe.COLUMN_1 as "Column_1",
fe.COLUMN_2 as "Column_2",
fe.COLUMN_3 as "Column_3"))))) as xml
FROM FOREXAMPLE_TABLE fe
The results returned from the select statement.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body xmlns:ns1="http://Custom_Column/types/"><ns1:New_Instance>
<ns1:Input_XMLDoc><Column_2>This column is not null</Column_2>
</ns1:Input_XMLDoc></ns1:New_Instance></soap:Body></soap:Envelope>
The desired results for the select statement.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body xmlns:ns1="http://Custom_Column/types/"><ns1:New_Instance>
<ns1:Input_XMLDoc><Column_1></Column_1>
<Column_2>This column is not null</Column_2><Column_3></Column_3>
</ns1:Input_XMLDoc></ns1:New_Instance></soap:Body></soap:Envelope>
jeeman

An alternative may be be to use xmlconcat instead of xmlforest:
Time Start: 30.06.2007 18:52:41
PL/SQL procedure successfully completed.
michaels> select xmlelement
          ("soap:Envelope",
           xmlattributes
                  ('http://schemas.xmlsoap.org/soap/envelope/' as "xmlns:soap"),
           xmlelement
                ("soap:Body",
                 xmlattributes ('http://Custom_Column/types/' as "xmlns:ns1"),
                 xmlelement ("ns1:New_Instance",
                             xmlelement ("ns1:Input_XMLDoc",
                                         xmlconcat (xmlelement("Column_1", fe.column_1),
                                                    xmlelement("Column_2", fe.column_2),
                                                    xmlelement("Column_3", fe.column_3)
          ).extract('.').getstringval() as xml
from (select null column_1, 'This column is not null' column_2,
               null column_3
          from dual) fe
XML
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body xmlns:ns1="http://Custom_Column/types/">
    <ns1:New_Instance>
      <ns1:Input_XMLDoc>
        <Column_1/>
        <Column_2>This column is not null</Column_2>
        <Column_3/>
      </ns1:Input_XMLDoc>
    </ns1:New_Instance>
</soap:Body>
</soap:Envelope>

XMLGEN: Produce XML dump of a table WITH tags for null column values

I am new to generating XML so bear with me....
We have a customer who needs an XML extract of data, including tags for any column that is null.
I created a simple test case below using DBMS_XMLGEN.getXML. The first row (A1) has no null values and thus tags for columns A, BEE and CEE are produced. The second row (A2) has null in column BEE and thus tags for only columns A and CEE are produced.
Is there a way to force a tag for null column BEE in the second row?
create table foo (A varchar2(10), BEE number, CEE date);
insert into foo values ('A1',1,sysdate);
insert into foo values ('A2',null,sysdate);
SELECT DBMS_XMLGEN.getXML('SELECT * FROM foo') FROM dual;
<ROWSET>
<ROW>
<A>A1</A>
<BEE>1</BEE>
<CEE>27-SEP-12</CEE>
</ROW>
<ROW>
<A>A2</A>
<CEE>27-SEP-12</CEE>
</ROW>
</ROWSET>

What's the database version? (SELECT * FROM v$version)
Could you use this instead :
SQL> select xmlserialize(document
2           xmlelement("ROWSET",
3             xmlagg(
4               xmlelement("ROW",
5                 xmlelement("A", a)
6               , xmlelement("BEE", bee)
7               , xmlelement("CEE", cee)
8               )
9             )
10           )
11         -- for display purpose only :
12         as clob indent
13         )
14 from foo
15 ;
XMLSERIALIZE(DOCUMENTXMLELEMEN
<ROWSET>
<ROW>
    <A>A1</A>
    <BEE>1</BEE>
    <CEE>2012-09-27</CEE>
</ROW>
<ROW>
    <A>A2</A>
    <BEE/>
    <CEE>2012-09-27</CEE>
</ROW>
</ROWSET>
Or,
SQL> select xmlserialize(document
2           xmlquery(
3             '(#ora:view_on_null empty #)
4             {
5               <ROWSET>{fn:collection("oradb:/DEV/FOO")}</ROWSET>
6             }'
7             returning content
8           )
9           as clob indent
10         )
11 from dual;
XMLSERIALIZE(DOCUMENTXMLQUERY(
<ROWSET>
<ROW>
    <A>A1</A>
    <BEE>1</BEE>
    <CEE>2012-09-27</CEE>
</ROW>
<ROW>
    <A>A2</A>
    <BEE/>
    <CEE>2012-09-27</CEE>
</ROW>
</ROWSET>
(where "DEV" is my test schema)
If you want to stick with DBMS_XMLGEN, you're gonna have to use PL/SQL and setNullHandling procedure.
Edited by: odie_63 on 27 sept. 2012 17:14

How can I control creation of empty tags when using ora:view syntax?

I'm using XMLQuery and ora:view syntax to create xml resources in the database but I'd like to be able to prevent the creation of empty tags for null values in the table.
CREATE OR REPLACE PROCEDURE proc_ctsi_build is
XMLdoc XMLType;
BEGIN
DBMS_XDB.deleteResource('/public/CTSI/ctsi_phsall_rpt1.xml',1);
SELECT XMLQuery(
'<Progress_Report>
<Personnel_Roster>
{for $c in ora:view("CTSI_INVEST_SOURCE_V")
    let $username := $c/ROW/COMMONS_USERNAME/text(),
$expertise := $c/ROW/AREA_OF_EXPERTISE/text()
     return
<Investigator>
   <Commons_Username>{$username}</Commons_Username>
<Area_of_Expertise>{$expertise}</Area_of_Expertise>
</Investigator>}
</Personnel_Roster>
</Progress_Report>'
RETURNING CONTENT) INTO XMLdoc FROM DUAL;
IF(DBMS_XDB.CREATERESOURCE('/public/CTSI/ctsi_phsall_rpt1.xml', XMLdoc)) THEN
DBMS_OUTPUT.PUT_LINE('Resource is created');
ELSE
DBMS_OUTPUT.PUT_LINE('Cannot create resource');
END IF;
COMMIT;
END;
In this example how can I prevent getting <Area_of_Expertise/> in my output when AREA_OF_EXPERTISE is null in the table?
Thanks

Hi,
you can use if else conditions.
{if ($expertise) then
<Area_of_Expertise>{$expertise}</Area_of_Expertise>
else ()}
**not tested**
Ants
Message was edited by:
Ants Hindpere

Choice format for null or empty string vs non-empty

How can I provide a choice format string for null or empty substitution strings?
I know one would not nomally do this, but the substitution strings are being passed in by an independant legacy code. I need something equivalent to
Some message with a choice {0,choice,null#nothing|not-null#something}
Unfortunately, programatic implementation is not currently an option

Ya, I will try that. That seems to be a good idea. Thanks for the response.
I have one more query. Whenever we add a new column to any table in Oracle, the column name is stored in Upper case. So when we generate XML File from the database, all the tags are either in upper case (or we can use qry.useLowerCaseTagNames() to retrieve the tag names in lower case). But the XSD contains tag names in mixed case. So when validating the XML Document against an XSD, it throws a validation error.
Is there any way I can avoid this?

Check for null and empty - Arraylist

Hello all,
Can anyone tell me the best procedure to check for null and empty for an arraylist in a jsp using JSTL. I'm trying something like this;
<c:if test="${!empty sampleList}">
</c:if>
Help is greatly appreciated.
Thanks,
Greeshma...

A null check might not be you best option. If your requirement is you must have both the date and time component supplied in order to populate EventDate, then I would use a Script Functoid that takes data and time as parameters.
In the C# method, first check if either is an empty string, if so return an empty string.
If not, TryParse the data, if successful, return a valid data string for EventDate. If not, error or return empty string, whichever satsifies the requirement.

[svn:bz-trunk] 11030: Tweak the deserialization of ASObjects to treat an empty string for the type of an object as null .

Revision: 11030
Author:   [email protected]
Date:     2009-10-20 11:35:02 -0700 (Tue, 20 Oct 2009)
Log Message:
Tweak the deserialization of ASObjects to treat an empty string for the type of an object as null. It appears that there is some logic in the LC remoting code that relies on a non-null class name to always exist. This change reverts to the old behavior of not allowing empty string as a value for the ASObject.namedType.
This should fix bug 2448442 and its duplicates caused by the recent serialization changes.
I don't think this is the perfect fix. Pending further investigation, a better fix would be either:
a. If it's OK to assume that empty string should always mean null for the type of the ASObject, the code that enforces it should be in the setter/getter inside ASObject and not in the deserializer.
b. ASObject doesn't guarantee that a named type exists or is valid. In that sense an empty string is as bad as some random characters that cannot be a valid class name in java, so depending on how disruptive it may be, the fix should be in any logic that uses ASObject.getType().
Modified Paths:
    blazeds/trunk/modules/core/src/flex/messaging/io/amf/AbstractAmfInput.java

Hi Pavan,
"In your payload there is no namespace prefix for the elements under PayloadHeader element."
Yes, you are right - but this message is standard AQ Adapter Header message - it's not defined by me. I just used message which was automatically added to my project when I have defined AQ Adapter.
"In your process is the default namespace is same as namespace value of tns ??"
Do you mean targetNamespace? If yes it's different as it points to process "targetNamespace="http://xmlns.oracle.com/PF_SOA_jws/PF_APPS/APPS_PROCESS" (names of application and process have changed as I try different ways to do that)
ns1 is: xmlns:ns1="http://xmlns.oracle.com/pcbpel/adapter/aq/PF_SOA/PF_APPS/PO_AQ"
"another thing is tns and ns1 should have same values.."
When I create a variable of header type, namespace ns1 is automatically created for it. I set it as property of receive activity. When process is instantiated on the serwer I get the error in which you can see that namespace is tns.
Maybe I'm doing something wrong but I don't see how I could fix this in my process.
You can see that the message I get on the server has nothing in common with the application/project/process names. Is it possible to define such variable?
Regards
Pawel
PS:
In Transformation xsl file, both variables (source and target) has tns namespace for Header and PayloadHeader, and no namespace for subfields.
Edited by: pawel.fidelus on 2010-01-05 02:37

Check for null or empty in the functoid

I want to check for null and empty values on input source node. If there exists a null or empty in the input source node, I should not pass that to output destination node. Does the
following attachment work? I want to check for null or empty in the date and time and then concatenate them to send to output. If any of them is null or empty, the other should not fail. In the Not Equal Functoid I am checking for blank, but how to check for
null?

A null check might not be you best option. If your requirement is you must have both the date and time component supplied in order to populate EventDate, then I would use a Script Functoid that takes data and time as parameters.
In the C# method, first check if either is an empty string, if so return an empty string.
If not, TryParse the data, if successful, return a valid data string for EventDate. If not, error or return empty string, whichever satsifies the requirement.

[svn:fx-trunk] 12788: By popular demand, we now allow for empty child property tags for Array type properties.

Revision: 12788
Revision: 12788
Author:   [email protected]
Date:     2009-12-10 07:46:54 -0800 (Thu, 10 Dec 2009)
Log Message:
By popular demand, we now allow for empty child property tags for Array type properties. Coerced to empty array '[]'.
QE notes: None
Doc notes: None
Bugs: SDK-24500
Reviewer: Paul
Tests run: Checkin
Is noteworthy for integration: No
Ticket Links:
    http://bugs.adobe.com/jira/browse/SDK-24500
Modified Paths:
    flex/sdk/trunk/modules/compiler/src/java/flex2/compiler/mxml/builder/AbstractBuilder.java
    flex/sdk/trunk/modules/compiler/src/java/flex2/compiler/mxml/builder/ComponentBuilder.jav a

Hi John,
Sorry to tell but tab completion is still failing on my Windows XP/Indesign CS5 (caught by Indesign).
I just saw your remark on coloring text, here is an example pulled out from Peter's book "ScriptUI for dummies":
var w = new Window ("dialog");
var s = w.add ("statictext", undefined, "Static");
var e = w.add ("edittext", undefined, "Edit");
var b = w.add ("button", undefined, "Button");
// The window's backround
w.graphics.backgroundColor = w.graphics.newBrush (w.graphics.BrushType.SOLID_COLOR, [0.5, 0.0, 0.0]);
// Font and its colour for the first item, statictext
s.graphics.font = ScriptUI.newFont ("Helvetica", "Bold", 30);
s.graphics.foregroundColor = s.graphics.newPen (w.graphics.PenType.SOLID_COLOR, [0.7, 0.7, 0.7], 1);
// Font and colours for the second item, edittext
e.graphics.font = ScriptUI.newFont ("Letter Gothic Std", "Bold", 30);
e.graphics.foregroundColor = e.graphics.newPen (e.graphics.PenType.SOLID_COLOR, [1, 0, 0], 1);
e.graphics.backgroundColor = e.graphics.newBrush (e.graphics.BrushType.SOLID_COLOR, [0.5, 0.5, 0.5]);
// Font for the tird control, a button. Can't set colours in buttons
b.graphics.font = ScriptUI.newFont ("Minion Pro", "Italic", 30);
w.show ();
Loic

Specifying empty tag style

Hi all. I'm using dbms_xmlquery.useNullAttributeIndicator, and for a reason I'd rather not go into I need the tags to be separate open-close tags (<tag></tag>) instead of the more elegant <tag/> tag. I'd also like to suppress the NULL="TRUE" attribute if possible. I'm open to changing our routine to use DBMS_XMLGEN if it helps in the above. Many thanks in advance for your help.

Hi,
With DBMS_XMLGEN, you can get rid of the NULL attribute, but empty tags will appear in the short form :
SQL> set serveroutput on
SQL> DECLARE
2    ctx    dbms_xmlgen.ctxHandle;
3    sqlstr varchar2(4000) := 'SELECT * FROM scott.emp WHERE rownum = 1';
4    res    clob;
5 BEGIN
6    ctx := dbms_xmlgen.newContext(sqlstr);
7    dbms_xmlgen.setNullHandling(ctx, dbms_xmlgen.EMPTY_TAG);
8    res := dbms_xmlgen.getXML(ctx);
9    dbms_xmlgen.closeContext(ctx);
10    dbms_output.put_line(res);
11 END;
12 /
<?xml version="1.0"?>
<ROWSET>
<ROW>
<EMPNO>7369</EMPNO>
<ENAME>SMITH</ENAME>
<JOB>CLERK</JOB>
<MGR>7902</MGR>
<HIREDATE>17/12/80</HIREDATE>
<SAL>800</SAL>
<COMM/>
<DEPTNO>20</DEPTNO>
</ROW>
</ROWSET>
PL/SQL procedure successfully completed
On the latest release (11.2), and only for particular cases, you might be able to do what you want with XQuery.
See § Oracle XQuery Extension-Expression Pragmas on this page :
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16659/xdb_xquery.htm
Here's also an example :
SELECT XMLSerialize(
document
XMLQuery(
'(#ora:view_on_null empty #)
   <ROWSET>
    for $i in fn:collection("oradb:/SCOTT/EMP")/ROW
    where $i/EMPNO = 7566
    return $i
   </ROWSET>
returning content
as clob
FROM dual;
<ROWSET><ROW><EMPNO>7566</EMPNO><ENAME>JONES</ENAME><JOB>MANAGER</JOB><MGR>7839</MGR><HIREDATE>1981-04-02</HIREDATE><SAL>2975</SAL><COMM></COMM><DEPTNO>20</DEPTNO></ROW></ROWSET>

Custom tag for Marquee in JSF

Hi,
I am trying to develop a custom tag for Marquee in JSF, my usecase is to display a value from managed bean(Dynamically). please find the code below and guide me where i have made mistake
regards
Sandeep
Component class:
package customtags;
import javax.el.ValueExpression;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
public class Marquee extends UIComponentBase {
     public static final String COMPONENT_TYPE = "marqueecomp";
     public static final String RENDERER_TYPE = "marqueeRenderer";
     private Object[] _state = null;
     private String value;
     public String getValue() {
          if (null != this.value) {
               return this.value;
          ValueExpression _ve = getValueExpression("value");
          return (_ve != null) ? (String) _ve.getValue(getFacesContext()
                    .getELContext()) : null;
     public void setValue(String marquee) {
          this.value = marquee;
     public String getFamily() {
          // TODO Auto-generated method stub
          return COMPONENT_TYPE;
//     public void encodeBegin(FacesContext context) throws IOException {
//          ResponseWriter writer = context.getResponseWriter();
//          writer.startElement("marquee", this);
//          writer.write(getValue());
//          writer.endElement("marquee");
     public void restoreState(FacesContext context, Object state) {
          this._state = (Object[]) _state;
          super.restoreState(_context, this._state[0]);
          value = (String) this._state[1];
     public Object saveState(FacesContext _context) {
          if (_state == null) {
               _state = new Object[2];
          state[0] = super.saveState(context);
          _state[1] = value;
          return _state;
Tag Class:
package customtags;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.webapp.UIComponentELTag;
public class MarqueeTag extends UIComponentELTag {
     protected ValueExpression marquee;
     public String getComponentType() {
          // TODO Auto-generated method stub
          return Marquee.COMPONENT_TYPE;
     public String getRendererType() {
          // TODO Auto-generated method stub
          return Marquee.RENDERER_TYPE;
     * protected void setProperties(UIComponent component) {
     * super.setProperties(component); Marquee marqComp = (Marquee) component;
     * if (marquee != null) { marqComp.setValue(marquee); } }
     protected void setProperties(UIComponent component) {
          super.setProperties(component);
          Marquee marqComp = null;
          try {
               marqComp = (Marquee) component;
          } catch (ClassCastException cce) {
               throw new IllegalStateException(
                         "Component "
                                   + component.toString()
                                   + " not expected type. Expected: com.foo.Foo. Perhaps you're missing a tag?");
          if (marquee != null) {
               //marqComp.setValueExpression("value", marquee);
               marqComp.setValue("fsdfsdfsdfsdfsd");
     * @return the marquee
     public ValueExpression getMarquee() {
          return marquee;
     * @param marquee
     * the marquee to set
     public void setMarquee(ValueExpression marquee) {
          this.marquee = marquee;
*.tld file*
<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
     version="2.1">
     <tlib-version>1.0</tlib-version>
     <short-name>marqueecomp</short-name>
     <uri>http://tags.org/marquee</uri>
     <tag>
          <name>marqueeTag</name>
<tag-class>customtags.MarqueeTag</tag-class>
<body-content>empty</body-content>
<attribute>
<description><![CDATA[Your description here]]></description>
<name>id</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<description><![CDATA[Your description here]]></description>
<name>value</name>
</attribute>
     </tag>
</taglib>
Renderer class:
package customtags;
import java.io.IOException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
public class MarqueeRenderer extends Renderer {
     public void encodeBegin(final FacesContext facesContext,
final UIComponent component) throws IOException {
super.encodeBegin(facesContext, component);
final ResponseWriter writer = facesContext.getResponseWriter();
writer.startElement("DIV", component);
/*String styleClass =
(String)attributes.get(Shuffler.STYLECLASS_ATTRIBUTE_KEY);
writer.writeAttribute("class", styleClass, null);*/
public void encodeEnd(final FacesContext facesContext,
final UIComponent component) throws IOException {
final ResponseWriter writer = facesContext.getResponseWriter();
writer.endElement("DIV");
in Faces-Config:
<component>
          <display-name>marqueecomp</display-name>
          <component-type>marqueecomp</component-type>
          <component-class>customtags.Marquee</component-class>
          <component-extension>
<renderer-type>marqueeRenderer</renderer-type>
</component-extension>
     </component>
     <render-kit>
<renderer>
<component-family>marqueecomp</component-family>
<renderer-type>marqueeRenderer</renderer-type>
<renderer-class>customtags.MarqueeRenderer</renderer-class>
</renderer>
</render-kit>
In class path --->marquee.taglib.xml
<?xml version="1.0"?>
<!DOCTYPE facelet-taglib PUBLIC
"-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
"http://java.sun.com/dtd/facelet-taglib_1_0.dtd">
<facelet-taglib>
<namespace>http://tags.org/marquee</namespace>
<tag>
<tag-name>marqueeTag</tag-name>
<component>
<component-type>marqueecomp</component-type>
<renderer-type>marqueeRenderer</renderer-type>
</component>
</tag>
</facelet-taglib>
*.xhtml file*
<html xmlns="http://www.w3.org/1999/xhtml"
     xmlns:ui="http://java.sun.com/jsf/facelets"
     xmlns:h="http://java.sun.com/jsf/html"
     xmlns:f="http://java.sun.com/jsf/core" xml:lang="en" lang="en"
     xmlns:a4j="http://richfaces.org/a4j"
     xmlns:rich="http://richfaces.org/rich" xmlns:mycomp="http://tags.org/marquee">
<head>
<title>DEBTDOC Home Page</title>
<meta http-equiv="keywords" content="enter,your,keywords,here" />
<meta http-equiv="description"
     content="A short description of this page." />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="../css/common.css"></link>
<script language="javascript" src="../script/common.js"></script>
</head>
<body>
<f:view>
<mycomp:marqueeTag value="hello World"></mycomp:marqueeTag>

There exist the JSTL SQL taglib, but I don't recommend this. It should only be used for quick development and testing. For database connectivity, rather create a data layer with DAO classes which you on its turn just plug in your business layer (with servlets).

Marshalling HashMap with JAXB 2.0 - empty tags & ill schema

Hi all,
I expected JAXB 2.0 to be capable to handle basic classes like HashMap, but it does not look so. I have two classes: SimpleNegotiationManager which has a property HashMap in which are stored the instances of SimpleInitiatedConversation:
package xml;
import javax.xml.bind.annotation.*;
import java.util.HashMap;
@XmlAccessorType(AccessType.FIELD)
@XmlRootElement
public class SimpleNegotiationManager {
    @XmlElement
    protected HashMap<String, SimpleInitiatedConversation> initiatedConversations;
    public SimpleNegotiationManager() {
    public HashMap<String, SimpleInitiatedConversation> getInitiatedConversations() {
        if (initiatedConversations == null) {
            initiatedConversations = new HashMap();
        return initiatedConversations;
    public void setInitiatedConversations(HashMap<String, SimpleInitiatedConversation> initiatedConversations) {
        this.initiatedConversations = initiatedConversations;
}and
package xml;
import javax.xml.bind.annotation.*;
import java.util.ArrayList;
import java.util.List;
@XmlAccessorType(AccessType.FIELD)
@XmlType
public class SimpleInitiatedConversation {
    @XmlElement
    protected List<String> messages;
    protected String conversationID;
    protected int protocolState;
    public SimpleInitiatedConversation() {
    public List<String> getMessages() {
        if (messages == null) {
            messages = new ArrayList();
        return messages;
    public void setMessages(List<String> messages) {
        this.messages = messages;
    public int getProtocolState() {
        return protocolState;
    public void setProtocolState(int protocolState) {
        this.protocolState = protocolState;
    public String getConversationID() {
        return conversationID;
    public void setConversationID(String conversationID) {
        this.conversationID = conversationID;
}When I marshalled SimpleNegotiationManager while the HashMap was filled with several <String,SimpleInitiatedConversation> entries, in the output were empty tags initiatedConversations:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<simpleNegotiationManager>
<initiatedConversations>
</initiatedConversations>
</simpleNegotiationManager>When I used schemagen to generate a schema, it produced:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:complexType name="simpleInitiatedConversation">
    <xs:sequence>
      <xs:element name="messages" type="xs:string" maxOccurs="unbounded" minOccurs="0"/>
      <xs:element name="conversationID" type="xs:string" minOccurs="0"/>
      <xs:element name="protocolState" type="xs:int"/>
    </xs:sequence>
</xs:complexType>
<xs:element name="simpleNegotiationManager" type="simpleNegotiationManager"/>
<xs:complexType name="simpleNegotiationManager">
    <xs:sequence>
      <xs:element name="initiatedConversations" type="hashMap" minOccurs="0"/>
    </xs:sequence>
</xs:complexType>
<xs:complexType name="hashMap">
    <xs:complexContent>
      <xs:extension base="abstractMap">
        <xs:sequence/>
      </xs:extension>
    </xs:complexContent>
</xs:complexType>
<xs:complexType name="abstractMap" abstract="true"/>
</xs:schema>Particularly the description of HashMap seems ill - there is not specified that the HashMap has keys String and values SimpleInitiatedConversation.
Unfortunatelly, the j2s-xmlAdapter-field example available with JAXB 2.0 is more complicated than I need. I just need to store/load HashMap into/from XML and I do not care what it looks like. Is it possible to avoid extending XmlJavaTypeAdaptor for a simple storing a HashMap into XML? Perhaps I use improper annotations in the source code, but I cannot get it working. Any clue?

Ok i figured out one way of doing this by using some classes from JAXP...
SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema s = null;
try{
    s = sf.newSchema(new File("Sources/schema/test.xsd"));
}catch(Exception e){
    System.err.println("Exception e: " + e.getMessage());
marshaller.setSchema(s);
//MyValidationHandler class implements the ValidationEventHandler interface
MyValidationHandler gv = new MyValidationHandler();
marshaller.setEventHandler(gv);If anyone has something to add let me know!!

Make an empty tag to appear

Hi Mark,
In 9iR2, I accidentally found out that if I want to make an empty tag to appear (when the column is null, for example), I can add a single space in NVL. For example,
in 9iR2,
select xmlelement("RootElement", xmlforest('Child1' as "Child1", nvl(null, ' ') as "Child2")) from dual;
XMLELEMENT("ROOTELEMENT",XMLFOREST('CHILD1'AS"CHILD1",NVL(NULL,'')AS"CHILD2"))
<RootElement>
<Child1>Child1</Child1>
<Child2/>
</RootElement>
But in 10gR2, I for the single space in the result,
<RootElement><Child1>Child1</Child1><Child2> </Child2></RootElement>
Is there a way to make the empty tag appear in 10gR2? Thanks.
Ben

Hi,
Mark has said that there was a bug in 9iR2 that would make an empty tag if a space was provided and that was fixed in 10g. But when I use a nested select such as this,
(select xmlagg(
                         xmlelement("PartyAlternateName", xmlattributes('AKA' as "casePartyNameType"),
                              xmlelement("PersonName",
                                   xmlforest(ma.first_name as "PersonGivenNamee",
                                        ma.middle_name as "PersonMiddleName",
                                        ma.last_name as "PersonSurName",
                                        ma.name_suffix as "PersonPrefixName")
                         from m_alias ma
                         where ma.mni_id = p_MniID
                    ) --- end of select PartyAlternateName
I do get an empty tag if one of the columns is null. Normally you won't get empty tag in 10g.
Ben

Creating empty-tag-elements with JAXB?

Hi,
is there any possibility to force JAXB to create empty-tag-elements? For example
<exampletag attribute="value" />
instead of
<exampletag attribute="value">
</exampletag>.
I really need to close my tags in the described way but have found no possibility to do so.
Thanks for your help
Daniel

Maybe this will help. I take advantage of the following behavior of the JAXB Marshaller to give me the form of output I require.
When a class (element) has "null" content, the output is of the form <tagger id="Unique"/>. When it has "empty" content, the output is of the form <tagger id="Unique"></tagger>.
Example code snippets:
For "null" content:
@XmlRootElement(name = "tagger")
public class TagClose
public void setId(String id) { this.id = id; }
public String getId() { return this.id; }
@XmlValue
String content = null;
@XmlAttribute(name="id")
String id = null;
}For "empty" content:
@XmlRootElement(name = "tagger")
public class TagClose
public void setId(String id) { this.id = id; }
public String getId() { return this.id; }
@XmlValue
String content = "";
@XmlAttribute(name="id")
String id = null;
}

JDBC Receiver does not convert empty string to NULL

Hello experts,
I am facing a problem with an INSERT statement to ORACLE DB where some of the fields are empty, for example:
- <STATEMENT_VLP_CONT_DETAILS>
- <TABLE_VLP_CONT_DETAILS ACTION="INSERT">
<TABLE>VLP_CONT_DETAILS</TABLE>
- <ACCESS>
<VLP_HDR_ID>43</VLP_HDR_ID>
<VLP_CONT_LINE_ID>1</VLP_CONT_LINE_ID>
<QUANTITY>1</QUANTITY>
<OWNER>CBHU</OWNER>
<SERIAL_NO>3372739</SERIAL_NO>
<CONT_ISO_CODE>2300</CONT_ISO_CODE>
<WEIGHT>6.44</WEIGHT>
<POL>ILASH</POL>
<POD>FRFOS</POD>
<FD>FRFOS</FD>
<OPER_CODE>COS</OPER_CODE>
<CUR_STOW_LOC>150102</CUR_STOW_LOC>
<PRV_STOW_LOC />
<HAZARDOUS>N</HAZARDOUS>
In the JDBC Receiver comm channel I selected: Interpretation of Empty String Values = NULL Value.
It seems the empty strings are not converted to NULL values as can be seen in the reflected SQL statement in RWB:
INSERT INTO VLP_CONT_DETAILS (VLP_HDR_ID, VLP_CONT_LINE_ID, QUANTITY, OWNER, SERIAL_NO, CONT_ISO_CODE, WEIGHT, POL, POD, FD, OPER_CODE, CUR_STOW_LOC, PRV_STOW_LOC, HAZARDOUS, EMPTY, REFER, OOG, HAZARD_IMDG, TEMP_SET, TEMP_MIN, TEMP_MAX, FRONT_OVL, REAR_OVL, RIGHT_OVW, LEFT_OVW, OVERHEIGHT, COMMODITY, BOOKING_REF, ALLOTMENT, YARD_LOC, LD_SEQ_CRANEID, LD_SEQ_NUMBER, LD_STATUS, STACKABLE, OPT_PORT_CODE1, OPT_PORT_CODE2, OPT_PORT_CODE3) VALUES (44, 1, 1, CBHU, 3372739 , 2300, 6.44, ILASH, FRFOS, FRFOS, COS, 150102, , N, N, N, N, , , , , , , , , , , , , , , 0, 64, N, , , )
So, I am getting the following error:
Could not execute statement for table/stored proc. "VLP_CONT_DETAILS" (structure "STATEMENT_VLP_CONT_DETAILS") due to java.sql.SQLException: ORA-00936: missing expression
Help would be appreciated.

Hi Effi,
There is a mismatch in the field and thier value.
Here field id 37
VLP_HDR_ID, VLP_CONT_LINE_ID, QUANTITY, OWNER, SERIAL_NO, CONT_ISO_CODE, WEIGHT, POL, POD, FD, OPER_CODE, CUR_STOW_LOC, PRV_STOW_LOC, HAZARDOUS, EMPTY, REFER, OOG, HAZARD_IMDG, TEMP_SET, TEMP_MIN, TEMP_MAX, FRONT_OVL, REAR_OVL, RIGHT_OVW, LEFT_OVW, OVERHEIGHT, COMMODITY, BOOKING_REF, ALLOTMENT, YARD_LOC, LD_SEQ_CRANEID, LD_SEQ_NUMBER, LD_STATUS, STACKABLE, OPT_PORT_CODE1, OPT_PORT_CODE2, OPT_PORT_CODE3
And value is 35
44, 1, 1, CBHU, 3372739 , 2300, 6.44, ILASH, FRFOS, FRFOS, COS, 150102, , N, N, N, N, , , , , , , , , , , , , , , 0, 64, N, , ,
Give empty values for nuil fields so that they can be made NULL by jdbc adapter
Regards
Suraj

Dbms_xmlgen empty tags for null

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