Ok so I had this problem in a few applications and want to solve it the best way once and for all.
java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (SCHEMA.PS_TXN_PK) violated or oracle.jbo.PCollException: JBO-28030: Could not insert row into table PS_TXN, collection id . What a pain.
So I have come across a couple of methods to solve this one:
1) Cleanup table regularly - this is a poor solution and is not guaranteed to work all the time. This involves creating a job to run (maybe twice a day) to sort the sequences out and clean up tables. Although it is the easiest to implement and requires no code changes. Can use this as a stop gap measure while your developers are fixing the real problem.
2) use a file store for passivation - better solution this one but I must test the performance impact and what to do if the filestore get corrupt. This involves setting the AM property jbo.passivationstore = file on all Application Modules. Not convinced this is the best solution but it should do for small apps.
3) using one schema with jbo.server.internal_connection - just specify your datasource name in this property to point to a utility schema and you should be good to go.
4) Catching the error and doing a clean at this point - Lot of work this one better than solution 1 but really not a productive use of time. (I havent tried this one)
I really need to finish the performance testing on our current application with the 126.96.36.199 and unit test before I make the call.