Welcome Jingker! Have you considered running the UBE in a single threaded job queue?
See E1: UBE: Frequently Asked Questions on Batch Job Queues (Doc ID 1504117.1)
There is not an English-language space for E1 in this Oracle Community, but there are several E1 subspaces in the My Oracle Support Community (MOSC), which is available to you if you have an active Oracle Support account.
If you still need assistance, I suggest you repost your question in CNC, DB and Operating System - JDE1 (MOSC) so that the E1 experts can see your question.