Hello ANAND,
I fixed this issue adding ip address of "http://repo1.maven.org/maven2" in hosts file of windows, because my error say that don't find this repository. Another alternative is configure a proxy gateway in ArcGIS Server Account of windows.
But, can you give more details about your issue??? Do you have karaf.log file???
Regard.
Javier Pintos
Ciampagna & Asoc.