Hi Kavitha,
UME is a core service and unless it starts, the J2EE server nodes wil not reach the running state. So you need to make sure that the ABAP part is fully functional.
Apart from the point Matt mentioned, check if the same stack SAPEXE* and SAPEXEDB* files were used when you did the kernel upgrade.
Check the output of:
sapcontrol -nr 00 -function GetVersionInfo
The versions should be same for all files.
regards,
Hemanth