Locking: PostgreSQL Vs. Oracle

Hi all,

I'm in the process of migrating a web application from Oracle to PostgreSQL and, after quite a few headaches, it's almost there. The last step (I hope) is getting to the bottom of an intermittent locking issue I see when I run integration tests. Most of the time, all tests are passing, but occasionally a test will fail with a stale state exception. Another developer ran a few IT tests and said one run stalled and never finished. Based on a cursory look at the internal PG tables, he said it looked like too many tables were locked due locks propagating out via foreign keys. I'm not sure how this could be possible.

I've been looking into the differences between PostgreSQL and Oracle locking behavior, but nothing has jumped out at me so far. I'm not a dba so hopefully I'm missing something obvious. Any advice would be greatly appreciated! Thanks.

Additional information;

Isolation Level: read committed for both dbs
JBoss 6.1 eap
PostgreSQL 9.4
Hibernate 3.64

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