Transient Attributes in Entity object vs View Object

Hi Everyone,
I need some suggestion with my project. I have a vendors table based on which I created an entity object (columns: vendor_id, contract_id, so on ) but I want to display vendor_name in UI which can be read from other table. I thought of using a transient attribute to populate this vendor_name.
It is working fine when I create a new record (where I handled this in LOV return value of vendor_id field and it return vendor_id, vendor_name values) but when there is edit/view of page, this vendor_name is null which means I need to populate it during page load /refresh time. Can someone suggest me a better way to populate this transient attributes. I also want to know when should I use transient attributes in Entity object (I saw most of the developer using VO transient attributes in these kind of situation)
Thanks,
Ravi

Hi,
also want to know when should I use transient attributes in Entity object (I saw most of the developer using VO transient attributes in these kind of situation)
transient values in entities are saved in the entity cache and thus can be changed in the UI. If you use transient attributes on the VO then these are read-only. All transient attribute however need to be populated upon page load, which you can do in a ViewRowImpl class that checks for a null value when the getter is called to then call a setter, or by using Groovy script as a default value (just set the attribute to script)
Frank

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hi all
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Hello Siva,
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I have a very similar error.
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Hi,
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The dependency values referred to are accessed when you edit the transient attribute in the view object. On the left hand panel select dependencies and shuttle the columns that the transient is dependent on. I don't think this matters for non-entity based views since the SQL is fixed but for entity based views this assures the dependent columns are added to the query even if they are not needed by the page.
http://docs.oracle.com/cd/E21764_01/web.1111/b31974/bcentities.htm#ADFFD20177

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Hi
Please post your question on this forum, your question belong to this forum.
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940637 - Your Use Case is a little vague\confusing.
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Hi Frank,
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I followed the link.But if a transient attribute is modified,then also ((ApplicationModule)getDataProvider()).getTransaction().isDirty() is returning true and the transaction is made dirty.
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Null Pointer Exception after adding Transient attribute in View Object

Hello Experts
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oracle.jbo.JboException: JBO-29000: Unexpected exception caught: java.lang.NullPointerException, msg=null
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Caused by: java.lang.NullPointerException
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    ... 62 more
## Detail 0 ##
java.lang.NullPointerException
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    at java.awt.Component.processEvent(Component.java:6054)
    at java.awt.Container.processEvent(Container.java:2041)
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    at java.awt.Component.dispatchEvent(Component.java:4482)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
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    at java.awt.EventQueue$1.run(EventQueue.java:603)
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    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
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    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
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Please advice....
Thanks

Hi,
Just the exception stack without any information like what JDev version, what expression you've used for the default value of the transient attribute etc., is not enough for us to help you.
-Arun

Sort view object rows with transient attributes

Hi ,
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Best regards
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K,
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Hi
Just wondering if the following behaviour is the expected one for a new attribute in an Entity Object;
The only way to be allowed to write an expression as default value is if the attribute itself is persistent. If transient is selected, the only available option for default value is SQL. So I need to put as persistent momentarily while writing my expression and then change it to transient.
Regards

Hi,
no, this is not intended. If you have a support contract or internal access to the bug database, please file a bug
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Transient Attributes in Entity object vs View Object

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