Hi Visu
You can follow the steps to perform the JAVA stack SP upgrade
1. Present process you can reset
2. In solution man create a MOPZ only for JAVA stack with same level SP
3. Download the STACK.XML file
4. Paste / replace the file where you are downloaded the Support package files
5. Start the SUM with new Stack file (only for JAVA) since you are already upgraded ABAP by using the SPAM
Or you can do the upgrade by using JSPM refer the SCN link http://scn.sap.com/docs/DOC-26069
Regards
Ram