I cleared my local repository and followed steps according to the below link.
This solved my problem !
http://stackoverflow.com/questions/2027753/how-to-deploy-applet-with-dependencies-jar-using-maven-and-sign-it
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http://maven.40175.n5.nabble.com/jarsigner-plugin
I'm not able to create signed jar files using jarsigner:1.2 plugin. I'm
getting the below exception
[INFO] BUILD FAILURE
[INFO]
[INFO] Total time: 13.788s
[INFO] Finished at: Tue Apr 17 15:52:27 CEST 2012
[INFO] Final Memory: