Hi All....

Here is the code that we can use to restrict a file size to be uploaded in RichFaces..

in web.xml we need to give

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<filter>
        <display-name>RichFaces Filter</display-name>
        <filter-name>richfaces</filter-name>
        <filter-class>org.ajax4jsf.Filter</filter-class>
        <init-param>
            <param-name>maxRequestSize</param-name>
            <param-value>file size</param-value>
        </init-param>
</filter>