Every filter defined in web.xml file should be used in a <filter-mapping> element. Otherwise such filters are not
invoked.
Noncompliant Code Example
<filter>
<filter-name>DefinedNotUsed</filter-name>
<filter-class>com.myco.servlet.ValidationFilter</filter-class>
</filter>
Compliant Solution
<filter>
<filter-name>ValidationFilter</filter-name>
<filter-class>com.myco.servlet.ValidationFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ValidationFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
See
