If you get "weblogic.transaction.internal.AppSetRollbackOnlyException: setRollbackOnly called on transaction " in your application, and have no clue what is going on, in Oracle Support you find this article:
"When setRollbackOnly() is Called in beforeCompletion() Synchronization Method , Thrown Exception Cannot be Obtained (Doc ID 1547327.1)"
you should apply a patch 16509700 AND specify -Dweblogic.transaction.allowOverrideSetRollbackReason=true , or upgrade to WLS 12.1.3
"When setRollbackOnly() is Called in beforeCompletion() Synchronization Method , Thrown Exception Cannot be Obtained (Doc ID 1547327.1)"
you should apply a patch 16509700 AND specify -Dweblogic.transaction.allowOverrideSetRollbackReason=true , or upgrade to WLS 12.1.3