EJB-3 Shouldn't persiting/removing child objects be reflected in OneToMany?

I'm a bit puzzled by behaviour I'm finding. (Toplink)
I modify the list of children under an entity, removing some child entities and inserting others.
The odd thing is that I seem to have to do two things each time. To add a child I set the child's parent pointer to the existing entity and persist is, but I also have to add the child to the OneToMany collection.
Conversely, on delete, I have to remove the child both from the collection and the entityManager.
Shouldn't the changes in the collection be automatic? Or, conversely, given that the parent link it mandatory, shouldn't removing the child from the collection suffice to delete it?
ps. to clarify:
If I don't change the OneToMany collection object the child changes aren't reflected even though I find the parent entity again.
Message was edited by:
malcolmmc

I'm afarid not - a generic feature that will allow to
delete orphan children didn't make it into the final
spec.
regards,
-marinaDo you happen to have any links to public discussions about this feature with regard to the development of the spec? This is a very nice feature in Hibernate and it's absence in EJB 3.0 is rather disappointing.
Thanks.

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public static var pageToRemove:Object;
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function onClickBtn1():void
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addChild(servicesHome);
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I’ve tried changing the public static var
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Any help please, I would greatly appreciate.

Great minds think alike LOL:
This is what I have now!!!
function onClickBtn1():void
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Cannot remove display object: must be child of the caller

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As a part of an Integration Requirement, I need to query Opportunity records that have been Modified after a specific date and time?
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Hi,
As far as I know this can't be done at once because you have to consider :
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AND
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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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http://www.dubant.com

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removeChild(currentChild);
this.addChild(newEnt);
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currentChild = newEnt;
newEnt.x = 659;
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Luke wrote:
I have the need to create a non persistable child object in the
jdoPreStore of a parent object. I then perform some tests on the parent
to determine if the child object needs to be persisted or not. If I leave
the child non persistent it still writes to the database.
I was performing the follwoing piece of code
Class Parent {
// The relationship is a 0 to many
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child.setParent(this);
getChild().add(child);
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persist (as desired).
Is this correct behaviour?? I dont think that it should be, but if it is
then I have a further problem.
If that child object inherits from another object and you remove the
getChild().add(child) kodo outputs an invalid object to the database. It
doesnt insert a row to the child table. But it inserts a row to the
childs inherited object table. This is now an invalid object and will
fail upon loading.
Any help on this would be appreciated.
Thanks
Luke.
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com

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hi all, i am going to remove a object from my array by using arrayList.However, it can`t work properly and did nth for me..i don`t know why...could anyone give me some suggestion and show me what i did wrong on my code ....i stated more detail next to my code...plesae help...
public class MusicCd
     private String musicCdsTitle;
        private int yearOfRelease;
     public MusicCd()
          musicCdsTitle = "";
          yearOfRelease = 1900;
     public MusicCd(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
          //yearOfRelease = newYearOfRelease;
     public MusicCd(String newMusicCdsTitle, int newYearOfRelease)
          musicCdsTitle = newMusicCdsTitle;
          yearOfRelease = newYearOfRelease;
     public String getTitle()
          return musicCdsTitle;
     public int getYearOfRelease()
          return yearOfRelease;
     public void setTitle(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
     public void setYearOfRelease(int newYearOfRelease)
          yearOfRelease = newYearOfRelease;
     public boolean equalsName(MusicCd otherCd)
          if(otherCd == null)
               return false;
          else
               return (musicCdsTitle.equals(otherCd.musicCdsTitle));
     public String toString()
          return("Music Cd`s Title: " + musicCdsTitle + "\t"
                 + "Year of release: " + yearOfRelease + "\t");
import java.util.ArrayList;
import java.io.*;
public class MusicCdStore
   ArrayList<MusicCd> MusicCdList;
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        MusicCdList = new ArrayList<MusicCd>( );
        readOperation theRo = new readOperation();
        MusicCd theCd;
        int muiseCdsYearOfRelease;
        String muiseCdsTitle;
          while(true)
                String continueInsertCd = "Y";
               do
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                    continueInsertCd = theRo.readString("Do you have another Cd ? (Y/N) : ");
               }while(continueInsertCd.equals("Y") || continueInsertCd.equals("y") );
               if(continueInsertCd.equals("N") || continueInsertCd.equals("n"));
                                                //MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));
                              break;
                  //System.out.println("You `ve an invalid input " + continueInsertCd + " Please enter (Y/N) only!!");
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                System.out.println("\nOur CD collection is: \n" );
          System.out.println(toString());
   public String toString( )
        String result= " ";
        for( MusicCd tempCd : MusicCdList)
             result += tempCd.toString() + "\n";
        return result;
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        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Enter a CD `s Title you are going to search : ") ;
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          for(MusicCd tempCd : results)
               System.out.println( tempCd.toString() );
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        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Please enter CD `s title you are going to remove : ") ;
        ArrayList<MusicCd> removeMusicCdResult = new ArrayList<MusicCd>();
              System.out.println("The CD that you just removed is " + keyword );
          for(MusicCd tempCd : removeMusicCdResult)
               System.out.println( tempCd.toString() );
   //problem occurs here : i am so confused of how to remove the exactly stuff from my arrayList
   //pls help
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        // tempMusicCd.setTitle(removeCdsTitle);
        //tempMusicCd.getTitle() = removeCdsTitle;
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        ArrayList<MusicCd> searchResult = new ArrayList<MusicCd>();
        for(MusicCd currentMusicCd : MusicCdList)
             if((currentMusicCd.getTitle()).indexOf(searchString) != -1)
                  searchResult.add(currentMusicCd);
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import java.util.*;
public class MusicCdStoreEngine{
     public static void main(String[] args)
          MusicCdStore mcs = new MusicCdStore( );
          mcs.insertCd();
          //display the Cd that you just insert
          mcs.displayAllCd();
          mcs.removeCd();
          mcs.displayAllCd();
          mcs.searchingMusicCd();
//Acutally result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
//Please enter CD `s title you are going to remove : hero
//The CD that you just removed is hero
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992
//>Exit code: 0
//Expected result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
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// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
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//The CD that you just removed is hero
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// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992<<-- it is not supposed to display cos i have deleted it from from array
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992<<-- i should have get this reuslt...cos it is already delete from my array
//>Exit code: 0
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public class readOperation{
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          String aString = null;
          try
                     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
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          String strSelection = null;
          try
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          catch (IllegalStateException e)
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               System.out.println("\nNoSuchElementException error occurred (input is exhausted)" + e);
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//problem occurs hereI'm not sure that the problem does occur within the
removeCdForTitle() method.
Your main() method calls removeCd() which obtains the title of
the CD to be removed (keyword). But remoceCd() never
calls removeCdForTitle(), so nothing is ever removed.

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deathwings wrote:
I was thinking bout that arraylist angle before, but it makes sense now so i think that will work ok. Thx kevin.Not a problem.
Taking the List idea one step further, you could have a parent Object/Interface that all of your game objects extend/implement. Let's call it GameObject.
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Hi, everyone,
How do I do to add and remove Shape3D objects dynamically from TransformGroup?
I have added two Shape3D objects in the TransformGroup and I wanted to remove one of it to add another. But, the following exception occurs when I try to use �removeChild� :
�Exception in thread "AWT-EventQueue-0" javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup node may be removed at javax.media.j3d.Group.removeChild(Group.java:345)�.
Why can I add Shape3D objects and I can�t remove them? Do I need to add Shape3D object in the BranchGroup and work only with the BranchGroup? If I do, I think this isn�t a good solution for the scene graph, because for each Shape3D object I will always have to use an associated BranchGroup.
Below, following the code:
// The constructor �
Shape3D shapeA = new Shape3D(geometry, appearance);
shapeA.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
shapeA.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
shapeA.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
shapeA.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
Shape3D shapeB = new Shape3D(geometry, appearance);
shapeB.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
shapeB.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
shapeB.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
shapeB.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
BranchGroup bg = new BranchGroup();
bg.setCapability(ALLOW_CHILDREN_READ);
bg.setCapability(ALLOW_CHILDREN_WRITE);
bg.setCapability(ALLOW_CHILDREN_EXTEND);
TransformGroup tg = new TransformGroup();
tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
tg.setCapability(TransformGroup.ALLOW_CHILDREN_READ);
tg.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
bg.addChild(tg);
tg.addChild(shapeA);
tg.addChild(shapeB);
// The method that removes the shapeB and adds a new shapeC �
Shape3D shapeC = new Shape3D(geometry, appearance);
shapeC.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
shapeC.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
shapeC.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
shapeC.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
tg.removeChild(shapeB);
tg.addChild(shapeC);Thanks a lot.
aads

�Exception in thread "AWT-EventQueue-0"
javax.media.j3d.RestrictedAccessException: Group:
only a BranchGroup node may be removed I would think that this would give you your answer -
Put a branch group between the transform and the shape. Then it can be removed.
Another thing you could try: This doesn't actually remove the shape, but at least causes it to hide. If you set the capabilities, I think you can write the appearance of the shapes. So, when you want to remove one of them, write an invisible appearance to it.

EJB-3 Shouldn't persiting/removing child objects be reflected in OneToMany?

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