This is simple... create a folder inside com folder as logica and inside logica create a folder app and now put ur java file emp_event.java inside this folder and run. do u understand.
<form method="Post" name="frm" action="./com/logica/app/emp_event" onsubmit="return validate();">

the error says it cant find any folder structure and there is no file in such non existing folder structure.

Hi Friend,

If you are calling servlet from action tag,then you need to import the package on servlet:

package com.logica.app;

In web.xml,

<servlet-name>YourServletName</servlet-name>
<servlet-class>com.logica.app.YourServletName</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AddUser</servlet-name>
<url-pattern>/com/logica/app/YourServletName</url-pattern>
</servlet-mapping>

Thanks