Symptom

Unable to do any action on issue, including Edit, Assign, Transit... along with the Primary Key Violation Exception thrown in log file.

SQL Exception while executing the following:
  INSERT INTO ***.changegroup (ID, issueid, AUTHOR, CREATED) VALUES (?, ?, ?, ?) (***: unique constraint (***.PK_CHANGEGROUP) violated )

Cause

The cause is the dis-synchronization between the sequence setting and seq_id of changegroup table, which may relate to the incomplete transaction triggered by database connection failure.

Workaround

1. Run the following SQL in your JIRA database to synchronize sequence setting for changegroup

         update SEQUENCE_VALUE_ITEM SET seq_id = (select max(ID) from changegroup) + 10 where seq_name='ChangeGroup'

2. Restart JIRA.