To Set a value to an attribute of child object from parent class file

[Dileep Kumar]

Hai all

1) I am trying to set a value to my attribute of child object from parent class file . but it is throwing a message that null pointer exception i want to know the reason for this .

The below code is throwing an error

1) MboSetRemote mboset=getMboSet("$req","tablename","id=:id");
2) mboRemote mbo=mboset.getMbo();
3) mbo.setValue("name","mynewvalue",11L);

But the below  code is working fine .. i want the difference between two


1) MboSetRemote mboset=getMboSet("$req","tablename","id=:id");
2) mboRemote mbo=mboset.add();     // why we need to call add() method ? 
3) mbo.setValue("name","mynewvalue",11L);

[kvnaresh]

hi dileep,
                MboSet is a result set, so it has more that one record in it. while fetching the Mbo we should specify which record we want. Generally if we know that there's only one record in the mboset (generally from child mbo there will be only one parent mbo) we use
         mboset.getMbo(0);
     
        In your first piece of code you are saying
          mboset.getMbo(); //which record should it fetch ??
        no record is being fetched, so it gives null pointer exception.

       In your second peice of code you are add() will always returns a new record, so it works fine.

         

[Dileep Kumar]

thank you naresh

[reyonireyoni]

this could be possible through constructor and it is initiated automatically whenever object is created.

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