JAXB -- Empty Object fields

I have a problem where I am using apache's open jpa to read objects from the database. The returned values populate beans that are auto generated from my schemas (.xsd). The beans are then marshalled into xml files. This process is utilized in our soap based web services and the resulting xml files are the web service responses.
The problem occurs when certain fields in the database are empty, the beans will have a null value for them and the xml file will have no trace of them. I would really prefer if the xml files would have an empty tag/element for the null values in the bean.
Does anyone know how to configure JAXB to not ignore null values?
I already tried setting the field to mandatory in the schema but I still get a missing field in the xml file.
example:
bean --> car
tire = 17
doors = 4
colour = null
speed = 250
xml --> car
<car>
<tire>17</tire>
<doors>4<doors</doors>
<speed>250</speed>
I would like <colour> to be in the resulting xml.
I hope someone can help with this.
Thanks

I think the value of the attribute is not getting Populated at the time you are using the Business Object inside a Workflow. Probablu you should put some wait UPTO 60 Seconds coding before checking the attribute. It happens and it is common:))
Thanks
Arghadip

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Best Practice question - null or empty object?

Given a collection of objects where each object in the collection is an aggregation, is it better to leave references in the object as null or to instantiate an empty object? Now I'll clarify this a bit more.....
I have an object, MyCollection, that extends Collection and implements Serializable(work requirement). MyCollection is sent as a return from an EJB search method. The search method looks up data in a database and creates MyItem objects for each row in the database. If there are 10 rows, MyCollection would contain 10 MyItem objects (references, of course).
MyItem has three attributes:
public class MyItem implements Serializable {
    String name;
    String description;
    MyItemDetail detail;
}When creating MyItem, let's say that this item didn't have any details so there is no reason to create MyitemDetail. Is it better to leave detail as a null reference or should a MyItemdetail object be created? I know this sounds like a specific app requirement, but I'm looking for a best practice - what most people do in this case. There are reasons for both approaches. Obviously, a bunch of empty objects going over RMI is a strain on resources whereas a bunch of null references is not. But on the receiving end, you have to account for the MyItemDetail reference to be null or not - is this a hassle or not?
I looked for this at [url http://www.javapractices.com]Java Practices but found nothing.

I know this sounds like a specific apprequirement,
, but I'm looking for a best practice - what most
people do in this case. It depends but in general I use null.Stupid.Thanks for that insightful comment.
>
I do a lot of database work though. And for that
null means something specific.Sure, return null if you have a context where null
means something. Like for example that you got no
result at all. But as I said before its's best to
keep the nulls at the perimeter of your design. Don't
let nulls slip through.As I said, I do a lot of database work. And it does mean something specific. Thus (in conclusion) that means that, in "general", I use null most of the time.
Exactly what part of that didn't you follow?
And exactly what sort of value do you use for a Date when it is undefined? What non-null value do you use such that your users do not have to write exactly the same code that they would to check for null anyways?

Error:Could not load type from assembly Culture=neutral, PublicKeyToken=null' because it contains an object field at offset 75 that is incorrectly aligned or overlapped by a non-object field.

I got an error while I creating a structure.
[FieldOffset(72)]
[MarshalAs(UnmanagedType.ByValArray,SizeConst= 3)]
public int[] DC;
[FieldOffset(75)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public float[] WIN;
[FieldOffset(83)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public byte[] name;
[FieldOffset(103)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] SET;
[FieldOffset(106)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public byte[] ID;
Error as like this-->object field at offset 75 that is incorrectly aligned or overlapped by a non-object field. But here size constant is 3 so I think after 72 offset will be 75..If I change the offset to 76 it will works fine. I think reason is that
size of int is 4. After changing that code will be like this.
[FieldOffset(72)]
[MarshalAs(UnmanagedType.ByValArray,SizeConst= 3)]
public int[] DC;
[FieldOffset(76)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public float[] WIN;
[FieldOffset(84)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public byte[] name;
[FieldOffset(104)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] SET;
[FieldOffset(107)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public byte[] ID;
But at that time I got the error as object field at offset 107 that is incorrectly aligned or overlapped by a non-object field..Can anyone tell me what is the main reason behind this..
Thanks..

Hi,
Please firstly take a look at this documentation:
MarshalAsAttribute.SizeConst Field
Indicates the number of elements in the fixed-length array or the number of characters (not bytes) in a string to import
Change your code like this should work:
[FieldOffset(72)]
[MarshalAs(UnmanagedType.ByValArray,SizeConst= 3)]
public int[] DC;
[FieldOffset(84)]//72+4*3
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public float[] WIN;
[FieldOffset(116)]//84+4*8
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
public byte[] name;
[FieldOffset(136)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] SET;
[FieldOffset(139)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public byte[] ID;
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BI 7 object field restrictions report

Hi,
Can someone please assist me. We are working on BI7, and I have created my restriction objects for the roles in RSECADMIN. I'm now trying to find a list of objects (and roles) that have 0CO_AREA as a restriction field. Can someone advise on how I would go about finding the report.
Thanks
Edited by: Pumza Mtshingila on Nov 24, 2008 10:08 AM

Hi Pumza,
I have to correct myself: the Analysis Authorization you build in RSECADMIN is not represented in PFCG as an object field (this is BIAUTH) but as an object field value, so if you run transaction S_BCE_68001423: Object values in Roles, filter on object S_RS_AUTH and field BIAUTH: you are able to report on the analysis authorizations.
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[see this document, page 21 & 22|https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/ded59342-0a01-0010-da92-f6b72d98f144]
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How to build a query across parent and child object fields?

As a part of an Integration Requirement, I need to query Opportunity records that have been Modified after a specific date and time?
Now, Opportunity has a child object called ProductRevenue with a one to many relationship. Is there anyway I can construct a querypage that will fetch records whose Opportunity fields 'OR' its child ProductRevenue's fields have been modified after a specific date and time?
I have tried using the SearchSpec argument, but it does not let me query across child object fields.
For eg:-
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Any help will be greatly appreciated. Thank you.

Hi,
As far as I know this can't be done at once because you have to consider :
- Every Opportunity and their time-limited ProductRevenues
AND
- Time-limited Opportunities
If you want to achieve this, you have to consider the 2 datasets separately and make your first query :
ObjOpptyQueryPageInput.ListOfOpportunity.Opportunity.searchspec = "([ModifiedDate] >= '01/01/2013 00:00:00')";
but also another query with the restriction on the ProductRevenue Searchspec.
This shouldn't be too hard because the searchspec functionality is present at each level :
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- ListOfOpportunity -> Opportunity -> ListOfProductRevenue -> ProductRevenue (the sub-level that you should use for the second query)
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http://www.dubant.com

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Hi experts,
pic link: http://img56.imageshack.us/my.php?image=screenhunter001fv3.jpg
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Hi experts,
pic link: http://img56.imageshack.us/my.php?image=screenhunter001fv3.jpg
I cant find "Main Ref. Object" field in Idoc CRMXIF_ORDER_SAVE_M02...
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Empty text field warning

I want to have a book printed from Aperture 1.5.4, but when I press the 'Buy Book' button, a dialog pops up:
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How do you wish to proceed? Cancel/Continue"
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prauz wrote:
I want to have a book printed from Aperture 1.5.4, but when I press the 'Buy Book' button, a dialog pops up:
"*Empty text field detected in book*
The book you are about to order contains an empty text field.
How do you wish to proceed? Cancel/Continue"
That's all very nice, to give me a warning like that, but how on earth am I going to find one invisible text field in a 50-page book full of colour photos??
hi, prauz
sounds like there is a text box (unfilled) and you haven't typed nor pasted text into it.
it's not that the text field is invisible, it's there yet to be selected and filled in with your information. so it is visible. have another looksie at it, look for the default letters or "Title Information Here"...
victor

Error could not access a java object field called allowAppDataInServContext after Applying Security

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^_^
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Thanks @ComputerWhiz - and apologies for the delay in responding.
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Hi,
I have a field in alv which holds values declared as WERT. In one case the field need to be empty. To do this I used CLEAR statement. But when I did like that, the field showed 0. How can I empty the field as it shows nothing?
Any help will be appreciated.

in the field catalog of the filed set
NO_ZERO:
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How to handle empty Dats field received from SAP RFC response

Hi All,
I am invoking a SAP RFC which gives me a Dats field in response.
A valid dats fields is successfully received by my pipelines.
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How to handle the empty Dats field from SAP

Hi Anant,
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Please mark as answer or vote as helpful if my reply does

Errors occurred during extraction of UD Connect object field- table not fou

Hi,
In BI 7.0 system I can't select any UD Connect source object on the "Extraction" tab page of the DataSource maitenance screen. If I type the table name (which is "UDITEST") into it and then hit the "Proposal" tab page, I get the following error:
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d) name of connector: SDK_JDBC
e) Source system name: SDK_JDBC
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Best regards,
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Hi,
Tried to give the Logical System Name in uppercase ie: UDC_LOCAL.
Now, when I click on the F4 of 'UD Connect Source Object' in Extraction tab, I get the message as below:
"Extraction of existing UD Connect data source objects".
But no list of tables is being displayed. When I entered the table name (UDITEST) manually, it gives the same error as :
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Rgds
Syam

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Hi everyone,
I am trying to do the following
Pull a list out of the system that would provide me with value's description for a specific authoirsation object / field
I have tried SE16 > AGR_1251 > one of my roles
I am getting the role, object, field, low and high values
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myrole - M_FORECAST - ACTVT - 03
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A 03 for a field may not always have the same meaning for different objects
Alternativly can I pull a list somewhere of the potential values and their description for a specific Authorization Object / Field combination?
Thank you
Coco

Please go through the following Tables:
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TACTZ : Contains the Authorization Object specific Activities.
TOBJ : Description of Authorization Objects
TOBJT: Text Description of Authorization Objects
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Empty Object Array

Hi,
How can I create an empty object array in Java?
Thanks
g

Object object[] = new Object[len]; //len is an
Integer-value for the length of the arrayThat's right..

JAXB -- Empty Object fields

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