Null-value="default" ignored?

I am experimenting with the null-value attribute on a field and
while a value of "exception" seems to be behaving as expected,
"default" seems to be no different than "none".
I have a trivial class with a String field (fieldTwo) that's
mapped to a non-null column in the database. Here is the JDO
mapping file:
<class name="DumbData" identity-type="application"
objectid-class="DumbData$Oid">
<extension vendor-name="kodo" key="table"
value="dumb_data"/>
<extension vendor-name="kodo" key="lock-column"
value="lock"/>
<extension vendor-name="kodo" key="class-column"
value="none"/>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="data-column"
value="id"/>
</field>
<field name="fieldOne">
<extension vendor-name="kodo" key="data-column"
value="field_one"/>
</field>
<field name="fieldTwo" null-value="default">
<extension vendor-name="kodo" key="data-column"
value="field_two"/>
</field>
<field name="theReference">
<extension vendor-name="kodo"
key="id-data-column" value="dumb_data2_id"/>
</field>
<field name="transientField"
persistence-modifier="transactional" />
</class>
Here is the generated SQL for an insert:
INSERT INTO dumb_data
(field_two, lock, id, field_one, dumb_data2_id)
VALUES (NULL, 0, 20, 1234, NULL)
Apparently, Kodo is attempting to insert a null for fieldTwo
(instead of '') although the mapping specifies
null-value="default". Am I missing something obvious and
completely embarassing myself here?
Thanks,
Alex
Alex Albu
Commerce Technologies, Inc.
21 Corporate Drive
Clifton Park, NY 12065

According to the JDO spec, setting null value = 'default' means that a null
for the field will be replaced with that field type's default value. There
is no Java default value for Strings. The default is null.No, the spec says (20.9.6.):
The null-value setting of "default" is used when the default
value for the data store element is to be used for null-valued
fields.
And it even gives an example for String:
[...] a null-valued String field would be written to the data
store as an empty (zero length) String where the null-value
setting is "default".
Alex Albu
Commerce Technologies, Inc.
21 Corporate Drive
Clifton Park, NY 12065

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<#
.SYNOPSIS
Resets columns in a document library to defaults for blank columns. Use this
after changing the content types or adding columns to a doc lib with existing files
.DESCRIPTION
Resets columns in a doc lib to their defaults. Will only set them if the columns are blank (unless overridden)
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Can restrict the update to a subset of columns, or have it look for all columns with defaults.
Will use the list defaults as well as folder defaults.
All names of columns passed in should use InternalName.
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If you call it on a folder, it will travel up the tree of folders to find the proper defaults
Author:
Chris Buchholz
[email protected]
@plutosdad
.PARAMETER list
The document library to update. Using this parameter it will update all files in the doc lib
.PARAMETER folder
The folder containing files to update. Function will update all files in this folder and subfolders.
.PARAMETER ParentFolderDefaults
Hashtable of internal field names as KEY, and value VALUE, summing up all the parent folders or list defaults.
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the correct defaults to apply.
If the field is managed metadata, then the value is a string
Currently only tested for string and metadata values, not lookup or date
.PARAMETER termstore
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If you are using the site collection specific termstore for some columns you want to update, and
the central termstore for others, then you should call this method twice, once with each termstore,
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.PARAMETER fieldsToCopy
Hashtable of internal field names, where KEY is the "to" field, and VALUE is the "from" field
Use this to copy values from one field to another for the item.
These override the defaults, and also cause the "from" (Value) fields to NOT be overwritten with defaults even if
they are in the fieldsToUpdate array.
Example: @{"MyNewColumn" = "My_x0020_Old_x0020_Column"}
.PARAMETER fieldsToUpdate
If supplied then the method will update only the fields in this array to their default values, if null then it will update
all fields that have defaults.
If you pass in an empty array, then this method will only copy fields in the fieldtocopy and not
apply any defaults
Example: @() - to only copy and not set any fields to default
Example2: @('UpdateField1','UpdateField2') will
.EXAMPLE
Set-SPListItemValuesToDefaults -list $list -fieldsToCopy @{"MyNewColumn" = "My_x0020_Old_x0020_Column"} -fieldsToUpdate @() -overwrite -termStore $termStore
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It will overwrite any values of MyNewColumn
.EXAMPLE
Set-SPListItemValuesToDefaults -list $list -overwrite
This will set all columns to their default values even if they are filled in already
.EXAMPLE
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.EXAMPLE
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.EXAMPLE
Set-SPListItemValuesToDefaults -list $list -fieldsToCopy @{"MyNewColumn" = "My_x0020_Old_x0020_Column"} -fieldsToUpdate @("MyNewColumn") -termStore $termStore
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but both of these will only happen for items where MyNewColumn is null
.EXAMPLE
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except for My_x0020_Old_x0020_Column which will not be modified even if it has a default value, and will also set MyNewColumn to the
value of My_x0020_Old_x0020_Column if the old value is not null
#>
function Set-SPListItemValuesToDefaults {
[CmdletBinding(SupportsShouldProcess=$true)]
param(
[Parameter(Mandatory=$true,ValueFromPipeline=$true,ParameterSetName="List")][Microsoft.SharePoint.SPList]$list,
[Parameter(Mandatory=$true,ValueFromPipeline=$true,ParameterSetName="Folder")][Microsoft.SharePoint.SPFolder]$folder,
[Parameter(Mandatory=$false,ParameterSetName="Folder")][HashTable]$ParentFolderDefaults,
[Parameter(Mandatory=$false)][HashTable]$fieldsToCopy,
[Parameter(Mandatory=$false)][Array]$fieldsToUpdate,
[Parameter(Mandatory=$false)][Microsoft.SharePoint.Taxonomy.TermStore]$termStore,
[Switch]$overwrite,
[Switch]$overwriteFromFields
begin {
#one or both can be null, but if both empty, then nothing to do
if ($null -ne $fieldsToUpdate -and $fieldsToUpdate.Count -eq 0 -and
( $null -eq $fieldsToCopy -or $fieldsToCopy.Count -eq 0)) {
Write-Warning "No fields to update OR copy"
return
if ($PSCmdlet.ParameterSetName -eq "Folder") {
$list = $folder.DocumentLibrary
if ($null -eq $termStore ) {
$taxonomySession = Get-SPTaxonomySession -site $list.ParentWeb.Site
$termStores = $taxonomySession.TermStores
$termStore = $termStores[0]
#if we did not pass in the parent folder defaults then we must go backward up tree
if ($PSCmdlet.ParameterSetName -eq "Folder" -and $null -eq $ParentFolderDefaults ) {
$ParentFolderDefaults = @{}
if ($null -eq $fieldsToUpdate -or $fieldsToUpdate.Count -gt 0) {
write-Debug "ParentFolderDefaults is null"
$tempfolder=$folder.ParentFolder
while ($tempfolder.ParentListId -ne [Guid]::Empty) {
Write-Debug "at folder $($tempfolder.Url)"
$pairs = $columnDefaults.GetDefaultMetadata($tempfolder)
foreach ($pair in $pairs) {
if (!$ParentFolderDefaults.ContainsKey($pair.First)) {
Write-Debug "Folder $($tempfolder.Name) default: $($pair.First) = $($pair.Second)"
$ParentFolderDefaults.Add($pair.First,$pair.Second)
$tempfolder = $tempfolder.ParentFolder
#listdefaults
Write-Debug "at list"
foreach ($field in $folder.DocumentLibrary.Fields) {
if ($field.InternalName -eq "_ModerationStatus") { continue }
#$field = $list.Fields[$name]
if (![String]::IsNullOrEmpty($field.DefaultValue)) {
#Write-Verbose "List default found key $($field.InternalName)"
if (!$ParentFolderDefaults.ContainsKey($field.InternalName)) {
Write-Debug "List Default $($field.InternalName) = $($field.DefaultValue)"
$ParentFolderDefaults.Add($field.InternalName,$field.DefaultValue)
process {
Write-Debug "Calling with $($PSCmdlet.ParameterSetName)"
Write-Debug "Parent folder hash has $($ParentFolderDefaults.Count) items"
if ($PSCmdlet.ParameterSetName -eq "List" ) {
$folder = $list.RootFolder
$ParentFolderDefaults=@{}
if ($null -eq $fieldsToUpdate -or $fieldsToUpdate.Count -gt 0) {
foreach ($field in $list.Fields) {
if ($field.InternalName -eq "_ModerationStatus") { continue }
if (![String]::IsNullOrEmpty($field.DefaultValue)) {
Write-Debug "List Default $($field.InternalName) = $($field.DefaultValue)"
$ParentFolderDefaults.Add($field.InternalName,$field.DefaultValue)
Write-Verbose "At folder $($folder.Url)"
$FolderDefaults=@{}
$FolderDefaults += $ParentFolderDefaults
if ($null -eq $fieldsToUpdate -or $fieldsToUpdate.Count -gt 0) {
$pairs = $columnDefaults.GetDefaultMetadata($folder)
foreach ($pair in $pairs) {
if ($FolderDefaults.ContainsKey($pair.First)) {
$FolderDefaults.Remove($pair.First)
Write-Debug "Folder $($folder.Name) default: $($pair.First) = $($pair.Second)"
$FolderDefaults.Add($pair.First,$pair.Second)
#set values
foreach ($file in $folder.Files) {
if ($file.CheckOutType -ne [Microsoft.SharePoint.SPFile+SPCheckOutType]::None) {
Write-Warning "File $($file.Url).CheckOutType = $($file.CheckOutType)) ... skipping"
continue
$item = $file.Item
$ItemDefaults=@{}
$ItemDefaults+= $FolderDefaults
#if we only want certain fields then remove the others
#Move this to every time we add values to the defaults
if ($null -ne $fieldsToUpdate ) {
$ItemDefaults2=@{}
foreach ($fieldInternalName in $fieldsToUpdate) {
try {
$ItemDefaults2.Add($fieldInternalName,$ItemDefaults[$fieldInternalName])
} catch { } #who cares if not in list
$ItemDefaults = $ItemDefaults2
#do not overwrite already filled in values unless specified
if (!$overwrite) {
$keys = $itemDefaults.Keys
for ($i=$keys.Count - 1; $i -ge 0; $i-- ) {
$key=$keys[$i]
try {
$val =$item[$item.Fields.GetFieldByInternalName($key)]
if ($val -ne $null) {
$ItemDefaults.Remove($key)
} catch {} #if fieldname does not exist then ignore, we should check for this earlier
#do not overwrite FROM fields in copy list unless specified
if (!$overwriteFromFields) {
if ($null -ne $fieldToCopy -and $fieldsToCopy.Count -gt 0) {
foreach ($value in $fieldsToCopy.Values) {
try {
$ItemDefaults.Remove($value)
} catch {} #who cares if not in list
#do not overwrite TO fields in copy list if we're going to copy instead
if (!$overwriteFromFields) {
if ($null -ne $fieldToCopy -and $fieldsToCopy.Count -gt 0) {
foreach ($key in $fieldsToCopy.Keys) {
$fromfield = $item.Fields.GetFieldByInternalName($fieldsToCopy[$key])
try {
if ($null -ne $item[$fromfield]) {
$ItemDefaults.Remove($key)
} catch {} #who cares if not in list
Write-Verbose $item.Url
$namestr = [String]::Empty
if ($ItemDefaults.Count -eq 0) {
write-Verbose "No defaults, copy only"
} else {
$str = $ItemDefaults | Out-String
$namestr += $str
Write-Verbose $str
if ($null -ne $fieldsToCopy -and $fieldsToCopy.Count -gt 0) {
$str = $fieldsToCopy | Out-String
$namestr +=$str
if ($PSCmdlet.ShouldProcess($item.Url,"Set Values: $namestr"))
#defaults
if ($null -ne $ItemDefaults -and $ItemDefaults.Count -gt 0) {
foreach ($key in $ItemDefaults.Keys) {
$tofield = $item.Fields.GetFieldByInternalName($key)
if ($tofield.TypeAsString -like "TaxonomyFieldType*") {
$taxfield =[Microsoft.SharePoint.Taxonomy.TaxonomyField]$tofield
$taxfieldValue = New-Object Microsoft.SharePoint.Taxonomy.TaxonomyFieldValue($tofield)
$lookupval=$ItemDefaults[$key]
$termval=$lookupval.Substring( $lookupval.IndexOf('#')+1)
$taxfieldValue.PopulateFromLabelGuidPair($termval)
if ($tofield.TypeAsString -eq "TaxonomyFieldType") {
$taxfield.SetFieldValue($item,$taxfieldValue)
} else {
#multi
$taxfieldValues = New-Object Microsoft.SharePoint.Taxonomy.TaxonomyFieldValueCollection $tofield
$taxfieldValues.Add($taxfieldValue)
$taxfield.SetFieldValue($item,$taxfieldValues)
} else {
$item[$field]=$ItemDefaults[$key]
#copyfields
if ($null -ne $fieldsToCopy -and $fieldsToCopy.Count -gt 0) {
#$fieldsToCopy | Out-String | Write-Verbose
foreach ($key in $fieldsToCopy.Keys) {
$tofield = $item.Fields.GetFieldByInternalName($key)
$fromfield = $item.Fields.GetFieldByInternalName($fieldsToCopy[$key])
if ($null -eq $item[$fromfield] -or ( !$overwrite -and $null -ne $item[$tofield] )) {
continue
if ($tofield.TypeAsString -eq "TaxonomyFieldType" -and
$fromfield.TypeAsString -notlike "TaxonomyFieldType*" ) {
#non taxonomy to taxonomy
$taxfield =[Microsoft.SharePoint.Taxonomy.TaxonomyField]$tofield
$termSet = $termStore.GetTermSet($taxfield.TermSetId)
[String]$fromval = $item[$fromfield]
$vals = $fromval -split ';#' | where {![String]::IsNullOrEmpty($_)}
if ($null -ne $vals -and $vals.Count -ge 0 ) {
$val = $vals[0]
if ($vals.Count -gt 1) {
write-Warning "$($item.Url) Found more than one value in $($fromfield.InternalName)"
continue
$terms =$termSet.GetTerms($val,$true)
if ($null -ne $terms -and $terms.Count -gt 0) {
$term = $terms[0]
$taxfield.SetFieldValue($item,$term)
Write-Verbose "$($tofield.InternalName) = $($term.Name)"
} else {
Write-Warning "Could not determine term for $($fromfield.InternalName) for $($item.Url)"
continue
} elseif ($tofield.TypeAsString -eq "TaxonomyFieldTypeMulti" -and
$fromfield.TypeAsString -notlike "TaxonomyFieldType*" ) {
Write-Debug "we are here: $($item.Name): $($fromfield.TypeAsString) to $($tofield.TypeAsString )"
#non taxonomy to taxonomy
$taxfield =[Microsoft.SharePoint.Taxonomy.TaxonomyField]$tofield
$termSet = $termStore.GetTermSet($taxfield.TermSetId)
$taxfieldValues = New-Object Microsoft.SharePoint.Taxonomy.TaxonomyFieldValueCollection $tofield
[String]$fromval = $item[$fromfield]
$vals = $fromval -split ';#' | where {![String]::IsNullOrEmpty($_)}
foreach ($val in $vals){
$terms =$termSet.GetTerms($val,$true)
if ($null -ne $terms -and $terms.Count -gt 0) {
$term=$terms[0]
$taxfieldValue = New-Object Microsoft.SharePoint.Taxonomy.TaxonomyFieldValue($tofield)
$taxfieldValue.TermGuid = $term.Id.ToString()
$taxfieldValue.Label = $term.Name
$taxfieldValues.Add($taxfieldValue)
} else {
Write-Warning "Could not determine term for $($fromfield.InternalName) for $($item.Url)"
continue
#,[Microsoft.SharePoint.Taxonomy.StringMatchOption]::ExactMatch,
$taxfield.SetFieldValue($item,$taxfieldValues)
$valsAsString = $taxfieldValues | Out-String
Write-Debug "$($tofield.InternalName) = $valsAsString"
} elseif ($tofield.TypeAsString -eq "TaxonomyFieldTypeMulti" -and
$fromfield.TypeAsString -eq "TaxonomyFieldType" ) {
#single taxonomy to multi
$taxfieldValues = New-Object Microsoft.SharePoint.Taxonomy.TaxonomyFieldValueCollection $tofield
$taxfield =[Microsoft.SharePoint.Taxonomy.TaxonomyField]$tofield
$taxfieldValues.Add($item[$fromfield])
$taxfield.SetFieldValue($item,$taxFieldValues)
Write-Verbose "$($tofield.InternalName) = $valsAsString"
} elseif ($tofield.TypeAsString -eq "TaxonomyFieldType" -and
$fromfield.TypeAsString -eq "TaxonomyFieldTypeMulti" ) {
#multi taxonomy to single taxonomy
Write-Warning "multi to non multi - what to do here"
continue
} elseif ($tofield.TypeAsString -eq "Lookup" -and
$fromfield.TypeAsString -ne "Lookup" ) {
#non lookup to lookup
Write-Warning "non lookup to lookup - still todo"
continue
} else {
#straight copy
$item[$tofield] = $item[$fromfield]
$item.SystemUpdate($false)
$folders = $folder.SubFolders | where name -ne "Forms"
$folders | Set-SPListItemValuesToDefaults -ParentFolderDefaults $FolderDefaults -fieldsToCopy $fieldsToCopy -fieldsToUpdate $fieldsToUpdate -overwrite:$overwrite -overwriteFromFields:$overwriteFromFields -termStore $termStore

Reading Numeric UDF null value in DI

We have a UDF of Numeric(4) that can be NULL, 0, 1, 2, etc. We try to read it from DI, and if it is NULL, then set the result to be -1 (the default value we difined), so we can differentiate NULL and 0.
The C# code we have look like this:
int LineNumber = -1;
SAPbobsCOM.Company oCompany;
// Code to get Company
SAPbobsCOM.Documents oDoc = oCompany.GetBusinessObject(BoObjectTypes.oQuotations);
oDoc.GetByKey(100); // Get the document by DocEntry
LineNumber = (int)oDoc.UserFields.Fields.Item("U_XX_LN").Value;
The problem is LineNumber gets 0 even if in the database U_XX_LN is NULL. We tried the code below and got the same result because oDoc.UserFields.Fields.Item("U_XX_LN").Value.ToString() always return '0' if it is NULL.
if (string.IsNullOrEmpty(oDoc.UserFields.Fields.Item("U_XX_LN").Value.ToString()))
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else
LineNumber = (int)oDoc.UserFields.Fields.Item("U_XX_LN").Value;
The question is: how can we set it to default -1 if in the database the value is NULL?
Thank you,
Grace

Hi Grace,
Unfortunately the DI API automatically converts database null values to a default value for the datatype (eg null for numeric becomes 0 and null for strings is an empty string). If you want to differentiate between null and zero you will need to query the table using the isnull command rather than reading the table through the UserTables object:
oRecordSet.DoQuery("select isnull(U_XX_LN, -1) as U_XX_LN from [@MYTABLE] where Code = 'MYCODE')
This will convert the null value to a -1 in the recordset so you can tell the difference between nulls and zeros.
Kind Regards,
Owen

Null value handling in LOVs

Has null value handling improved any in HTMLDB 1.6?
If my LOV has "Display null"=Yes (default null value is %null%) and I need to pass in a database NULL to a After Submit process, I need to do add a After Submit computation for each of these LOVs with something like
CASE WHEN :P1_ITEM='%null%' THEN NULL ELSE :P1_ITEM END
I have a couple dozen LOVs on a page and it is getting tiring to go and do this on each and every one!
Is there a better way?
Thanks

Hi Patrick,
we are currently moving over to Apex 4.02 and are doing some smoke tests on our existing apps.
I have come across an issue with your generic solution to the %null% issue above (incidently, for a long time it's the first piece of code I include when I start a new app... thank you!)
We found that a lot of our SQL Query (PL/SQL function body returning SQL query) reports were failing due to the session state of the LOVs still having a session state of %null% even after the RemoveNulls application process had run.
After debugging your generic process we found that the LOV_NULL_VALUE in the APEX_APPLICATION_PAGE_ITEMS view has changed from NULL to '%null%'.
so the fix was as below:-
BEGIN
    FOR rItem IN
      ( SELECT ITEM_NAME
          FROM APEX_APPLICATION_PAGE_ITEMS
         WHERE APPLICATION_ID   = TO_NUMBER(:APP_ID)
           AND PAGE_ID          IN (TO_NUMBER(:APP_PAGE_ID), 0)
           AND LOV_DISPLAY_NULL = 'Yes'
           AND LOV_DEFINITION   IS NOT NULL
-- change here
           AND LOV_NULL_VALUE = '%null' || '%'
    LOOP
        IF V(rItem.ITEM_NAME) = '%null' || '%'
        THEN
            Apex_Util.set_session_state(rItem.ITEM_NAME, NULL);
        END IF;
    END LOOP;
END;Cheers,
Gus.. (always a fan of your work!)

OSB to Object Types: difference between NULL value and not available

Hello all,
I have a question about Object Types. More specifically, how to differentiate between an empty value (null) and a string not available.
This is my case:
I have created an object type with three parameters.
CREATE OR REPLACE TYPE OSB_EMP_OBJ_TYPE AS OBJECT
(EMP_ID NUMBER
,DEPT_ID NUMBER
,ORDER_ID NUMBER
,CONSTRUCTOR FUNCTION OSB_EMP_OBJ_TYPE
RETURN self as result
/I would like to see what happens when I put an empty string into emp_id, NULL into DEPT_ID and nothing into ORDER_ID.
To do so I have this test script:
declare
p_emp OSB_EMP_OBJ_TYPE := OSB_EMP_OBJ_TYPE();
begin
p_emp.EMP_ID := '';
p_emp.DEPT_ID := null;
-- p_emp.ORDER_ID := null;
if p_emp.EMP_ID is null
then
    dbms_output.put_line('Empty');
end if;
if p_emp.DEPT_ID is null
then
    dbms_output.put_line('NULL');
end if;
if p_emp.ORDER_ID is null
then
    dbms_output.put_line('Not available');
end if;
end;The result of this is:
Empty
NULL
Not availableIt seems that Oracle treats all three situations alike. What I would like to achieve is a way to see that p_emp.ORDER_ID was not initialized.
To elaborate a bit: in our production system this procedure would be called from OSB and the object type would by the input for that procedure. Our database version is 10.2.0.5.0.
Our procedures look something like this:
procedure p_procedure ( p_emp in osb_emp_obj_type )
is
begin
do_something;
end;Can anyone tell me if there is a way to achieve this, so I can see whether or not a value in the object type was filled?
Thanks in advance!

Darn...
Eventually we want to use this for an update procedure. The client gets all current data from the database by calling a webservice that (using OSB) selects the data from our database. What we want to achieve is that the client can update that data, by returning only the changed fields to an update procedure.
We then handle an empty tag to update the field to null, and we ignore missing tags.
OSB itself can handle this, but PL/SQL can't.
I'm now thinking of adding an indicator to each optional field (clear_field_yn). OSB can still check for empty tags or missing tags. When a tag is empty, it's corresponding indicator will be set to 'Y'. If the tag is missing, then it will be set to 'N'.
Is that a solution to consider, or is there a much simpler approach possible?

Null Value in Crystal reports

Dear all,
I have a SQL report created in SAP, which has "where " condition to only show records having null in a field.
i.e.
Select Field1, Field2, Field3
from T0
where Field1 is null
The query works fine in SAP and SQL server management studio.
I am trying to create the report in Crystal reporter, but the syntax of Null is not accepted.
I have tested that
Field1=""
Isnull(Field1)=True
Isempty(Field1)=True
Those records with no value in the field just didn't display ...
What is the right Syntax to use?
Many thanks
Yang

Hi Gordon and Mark,
Thank you for both of your suggestions.
At the end, I found out that "convert Null to default" had been ticked in report options. I unticked it, and isnull() condition worked.
But I was surprised that with the option ticked the conditions of "equal to 0/""/" " "all didn't work ...
Many thanks
Yang

Using Convert to handle NULL values for empty Strings ""

After having had the problem with null values not being returned as nulls and reading some suggestion solution I added a converter to my application.
<converter>
    <converter-id>NullStringConverter</converter-id>
    <converter-for-class>java.lang.String</converter-for-class>
    <converter-class>com.j2anywhere.addressbookserver.web.NullStringConverter</converter-class>
</converter>
...I then implemented it as follows:
public String getAsString(FacesContext context, UIComponent component, Object object)
    System.out.println("Converting to String : "+object);
    if (object == null)
      System.out.println("READING null");
      return "NULL";
    else
      if (((String)object).equals(""))
        System.out.println("READING null (Second Check)");
        return null;
      else
        return object.toString();
public Object getAsObject(FacesContext context, UIComponent component, String value)
    System.out.println("Converting to Object: "+value+"-"+value.trim().length());
    if (value.trim().length()==0 || value.equals("NULL"))
      System.out.println("WRITING null");
      return null;
    else
      return value.toUpperCase();
...I can see that it is converting my values, however the object to which the inputText fields are bound are still set to empty strings ""
<h:inputText size="50" value="#{addressBookController.contactDetails.information}" converter="NullStringConverter"/>Also when reading the object values any nulls are already converted to empty strings before ariving at the converter. It seems that there is a default converter handling string values.
How can I resolve this problem as set nulls when the input value is an empty string other then checking every string in my class individually. I would really hate to pollute my object model with empty string tests.
Thanks in advance
Edited by: j2anywhere.com on Oct 19, 2008 9:06 AM

I changed my converter as suggested :
public Object getAsObject(FacesContext context, UIComponent component, String value)
    if (value == null || value.trim().length() == 0)
      if (component instanceof EditableValueHolder)
        System.out.println("SUBMITTED VALUE SET TO NULL");
        ((EditableValueHolder) component).setSubmittedValue(null);
      else
        System.out.println("COMPONENT :"+component.getClass().getName());
      System.out.println("Converting to Object: " + value + "< to " + null);
      return null;
    System.out.println("Converting to Object: " + value + "< to " + value);
    return value;
}which produces the following output :
SUBMITTED VALUE SET TO NULL
Converting to Object: < to null
Info : The INFO line however comes from my controller object where I print out the set value :
package com.simple;
import java.util.ArrayList;
import java.util.List;
public class Controller
private String information;
/** Creates a new instance of Controller */
public Controller()
    System.out.println("Createing Controller");
    information = "Constructed";
public String process()
    System.out.println("Info : "+getInformation());
    return "processed";
public String reset()
    setInformation("Re-Constructed");
    System.out.println("Info : "+getInformation());
    return "processed";
public String setNull()
    setInformation(null);
    System.out.println("Info : "+getInformation());
    return "processed";
public String getInformation()
    return information;
public void setInformation(String information)
    this.information = information;
}I also changes my JSP / JSF page a little. Here is the updated version
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%--
    This file is an entry point for JavaServer Faces application.
--%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
</head>
<body>
    <f:view>
      <h:form>
        <h:inputText id="value" value="#{Controller.information}"/>
        <hr/>
        <h:commandLink action="#{Controller.process}">
          <h:outputText id="clicker" value="Process"/>
        </h:commandLink>
        <hr/>
        <h:commandLink action="#{Controller.reset}">
          <h:outputText id="reset" value="Reset"/>
        </h:commandLink>
        <hr/>
        <h:commandLink action="#{Controller.setNull}">
          <h:outputText id="setNull" value="Set Null"/>
        </h:commandLink>
      </h:form>
    </f:view>
</body>
</html>The converter is declared for the String class in the faces configuration file. From the log message is appears to be invoked, however the object is not set to null.
I tested this with JSF 1.2_04-b20-p03 as well as 1.2_09-b02-FCS.
any other suggestions what could be causing this.

How does APEX check for null values in Text Fields on the forms?

Hello all,
How does APEX check for null values in Text Fields on the forms? This might sound trivial but I have a problem with a PL/SQL Validation that I have written.
I have one select list (P108_CLUSTER_ID) and one Text field (P108_PRIVATE_IP). I made P108_CLUSTER_ID to return null value when nothing is selected and assumed P108_PRIVATE_IP to return null value too when nothign is entered in the text field.
All that I need is to validate if P108_PRIVATE_IP is entered when a P108_CLUSTER_ID is selected. i.e it is mandatory to enter Private IP when a cluster is seelcted and following is my Pl/SQL code
Declare
v_valid boolean;
Begin
IF :P108_CLUSTER_ID is NULL and :P108_PRIVATE_IP is NULL THEN
v_valid := TRUE;
ELSIF :P108_CLUSTER_ID is NOT NULL and :P108_PRIVATE_IP is NOT NULL THEN
v_valid := TRUE;
ELSIF :P108_CLUSTER_ID is NOT NULL and :P108_PRIVATE_IP is NULL THEN
v_valid := FALSE;
ELSIF :P108_CLUSTER_ID is NULL and :P108_PRIVATE_IP is NOT NULL THEN
v_valid := FALSE;
END IF;
return v_valid;
END;
My problem is it is returning FALSE for all the cases.It works fine in SQL Command though..When I tried to Debug and use Firebug, I found that Text fields are not stored a null by default but as empty strings "" . Now I tried modifying my PL/SQL to check Private_IP against an empty string. But doesn't help. Can someone please tell me how I need to proceed.
Thanks

See SQL report for LIKE SEARCH I have just explained how Select list return value works..
Cheers,
Hari

How can I delete null values from List Item?

Hi Friends,
I used List item for field job_Type, I entered values in List item at design time through property pallet. When I run form I will see null values in this List Item.
How can I remove these null values from the List?
Best regards,
Shahzad

Dear Shahzad,
It can be removed by adding the following code in the When-new-Form-Instance.
Set_item_property('List name', required, property_true);
:block_name.list_name := <put your default value here>; (If you didn't oput the default value, then you will get some problem and the cursor may not navigate away from the list).
Senthil Alagu .P.

Null-value="default" ignored?

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