Error while updating task Cannot delete Comments

For Oracle Business Process Management Suite - Version 11.1.1.6.0 you might end with below error while working on a task. This Error occurs when you try to click on any button.

Error:

Error while updating task Cannot delete Comments.
Check the underlying exception and the database connection information. If the error persists, contact Oracle Support Services.
 ORABPEL-10101

Error while updating task .
Error while updating task Cannot delete Comments.
Check the underlying exception and the database connection information. If the error persists, contact Oracle Support Services.

at oracle.bpel.services.workflow.repos.driver.WFTask.updateComments(WFTask.java:5385)

Solution:

1) This issue has been identified as a bug in Oracle and Oracle has released a patch for the same 

(ORABPEL-10101 Reassign Error while Updating a Human Task (Doc ID 1562528.1) and

patch number Patch 16521896 ).

Applying a patch and doing rigorous testing on test Environment needs significant amount of time. Below we will discuss some simple work around solutions.

2) Reference OTN: https://community.oracle.com/thread/2410026

The above thread discussion suggests to check table wfcomments for any row with column wfcomment with a null value.The drawback with this approach is that if you encounter this issue on production , you might not have access to system table and Oracle suggests not to perform any operations on system tables

3) The simplest workaround solution to the problem : try to write a comment for the task. Once you have written a comment (say : Test/fix comment issue) try to click on the buttons for the task. Now you won’t get the error .

Regards,

LetsLearnOracleSOA Team