OPENJPA-1608, a fix was added to the InformixDictionary which causes the following SQL to be executed on each connection:
"SET ENVIRONMENT RETAINUPDATELOCKS 'ALL'"
I've had a request to allow a user to disable this option should they so choose. This JIRA will be used to simply add a property to allow a user to disable this SQL. By default this SQL will remain as-is today.