Please remove Lava_Adobe.ear from the /server/all/deploy/ folder. Lava_Adobe.ear is the BAM application. If you require BAM, run it in its own JBoss instance.
We are running into the same problem here on LiveCycle ES 8.2 turnkey installation. We didn't install BAM and the examples. Did you solve the OutOfMemoryError after removing BAM?
Within the LiveCycle ES Update 1 (ES2) JBoss turnkey you can quickly lower some database connection settings that will greatly reduce if not completely prevent the OOM issues you're seeing. Open the 'adobe-ds.xml' file and edit the 10 settings for both IDP_DS and the EDC_DS, reduce the timeout from 10 minutes to 1 minute for each. Next you can decrease the 30 for the same data sources by lowering them both to 20 (this setting can be fine tuned depending on your load but should not be lower than 20).