Record lock error occurs randomly, when same task opened in 2 browser tabs

Question

I am having an ADF UI taskflow with two flows(paths):
Flow1 - Edit DFF
ProcessParameters ----> router---> IFEDIT---->SetEditedStatusAttribute MethodCall --> editDFFpage
Flow2 - Manage DFF Accross All Modules
ProcessParameters ----> router---> IFSEARCH---->SearchQuerypanel editbutton>SetEditedStatusAttribute MethodCall --> editDFFpage
These two flows can be triggered from links in a task panel. Screenshot [http://act.us.oracle.com/~vmeka/lockerror/lockerror.JPG]
the method call setEditedStatusAttribute, calls an EOImpl method to set an attribute.
This in turn triggers lock() for all the associated EOs.
In following scenario failure occurs:
->1. Click Edit DFF task and keep the web browser tab/window open - lock is acquired.
->2. Open http://localhost7101/ManageFlex-WebApp_Test-context-root/faces/ManageFlex in another tab/window and open the Edit DFF task. lock is acquired again.
->3. In the same tab re-run the page by removing session details suffix.
Eg. http://dadvml0082.us.oracle.com:7108/ManageFlex-WebApp_Test-context-root/faces/ManageFlex?_afrLoop=19870268404083601&_afrWindowMode=0&_adf.ctrl-state=sbc4nhzgh_116
Remove the end part that starts with ?_afrLoop= and press enter in the Address bar of browser. lock is acquired third time.
->5. This re-runs the page, open Edit task again
->6. Without pressing cancel , open Manage DFF task
->7. Do not perform any search operation and open Edit FF task again. lock is acquired fourth time.
->8. Repeat steps 5-7 a few number of times
In step 5 or 7 I am hitting an exception with following message
JBO-26030: Failed to lock the record, another user holds the lock.
stack: (complete stack at [http://act.us.oracle.com/~vmeka/lockerror/stack1.txt] )
oracle.jbo.AlreadyLockedException: JBO-26030: Failed to lock the record, another user holds the lock.
at oracle.jbo.server.OracleSQLBuilderImpl.doEntitySelectForAltKey(OracleSQLBuilderImpl.java:1085)
at oracle.jbo.server.BaseSQLBuilderImpl.doEntitySelect(BaseSQLBuilderImpl.java:546)
at oracle.jbo.server.EntityImpl.setAttribute(EntityImpl.java:1485)
at oracle.apps.fnd.applcore.flex.dff.model.entity.DescriptiveFlexfieldEOImpl.updateDeploymentStatus(DescriptiveFlexfieldEOImpl.java:1804)
at oracle.apps.fnd.applcore.flex.dff.model.entity.DescriptiveFlexfieldEOImpl.setEditedStatus(DescriptiveFlexfieldEOImpl.java:1753)
at oracle.apps.fnd.applcore.flex.dff.uiModel.applicationModule.DFFSetupUIAMImpl.editDescriptiveFlexfield(DFFSetupUIAMImpl.java:770)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Any Idea why the lock error occurs after a few iterations, and not immediately after Edit DFF is opened in a second tab?
Thanks,
vikranth
Edited by: user10124649 on Nov 25, 2009 8:04 AM

Answer 1

Hi,
on the ApplicationModule, did you set the locking behavior to optimistic ? For web applications it should be optimistic and not pessimistic, which is the default setting. Select the AM and choose "Configurations" from the context menu. Click edit and select the property tabs. Look for the locking setting, which should be set to "pessimistic if you did not change it before. Just replace the current value with optimistic
Frank