Exception starting filter WicketFilter on Glassfish

[PJ Pillai]

Hello,

I deployed my first hello world application on Glass Fish server. I am using
Netbeans 6. I am getting following error:

WebModule[/MyApp]PWC1270: Exception starting filter WicketFilter
java.lang.NoClassDefFoundError: javax/servlet/Filter
       at java.lang.ClassLoader.defineClass1(Native Method)
       at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
....

Please help

Thanks,
Pravin