how to set class path in web.xml.

i have a war file, the classes inside web_inf/classes has been converted as jar, and placed in an ear.my war file is also located in ear file.

ear \
-> xxx.war
->xxx.jar

but iam getting 'java.lang.NoClassDefFoundError' when the war file trying to access the class file...

its urgent .... please provide any solution for it.....