Start of UME Service Failed - SAP NetWeaver Problem Analysis Guide (PAG) - SAP Library
A required service failed
If one or more required services failed to start, such as connector, dbpool, timeout, or configuration adapter, the UME service cannot start either. Look for a message in the defaultTrace.trc, such as: Error: Service dbpool failed to start
Can you check whether the above SAP note is valid in your case ?
Are there any contents under these directories ?
ls -la /usr/sap/PX2/DVEBMGS60/j2ee/cluster/server0/temp
ls -la /usr/sap/PX2/DVEBMGS60/j2ee/cluster/server0/temp/dbpool
Also check the solution suggested in this thread.
SAP XI server0 stopping after trying to start | SCN
Regards
RB