Hi Harsh,
unfortunately I cannot tell you how to solve the issue, but maybe I still can help somewhat. In my case re-Installation of LifeCycle Designer and SAP GUI did not help. I then just gave up trying to solve it and used another pc. On the other PC (with same Version of LifeCycle Designer and SAP-GUI) I could see all the Java scrip again and it was ok for me to use another machine because I normally do not have to work with Adobe Forms. Maybe this gives you a hint to solve the issue.
KR
Felix