JAVA admin (independent from UME)

Dear all,

we are currently preparing the upgrade of our AS JAVA production system and are facing a small challenge there:

We want to perform the upgrade in parallel with the ABAP part, UME of AS JAVA is stored in ABAP system. Therefore i am not able to log on AS JAVA part during ABAP downtime (because UME is not accessible). We dont want to change the UME configuration due to risk of unexpected issues.

1. Is there any kind of emergency user available for AS JAVA part (which is independant of UME) ? Is this user able to perform an upgrade or am i forced to use "j2ee_admin" ?

2. Is there any other possibility to perform the upgrade without available UME ?

Many thanks in advance !