Apply this filter in web.xml above all other filters (typically), to all requests where you plan
to use servlet scopes. This is also needed in order to dispatch requests to injectable filters
and servlets:
<filter>
<filter-name>guiceFilter</filter-name>
<filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>guiceFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
This filter must appear before every filter that makes use of Guice injection or servlet
scopes functionality. Typically, you will only register this filter in web.xml and register
any other filters (and servlets) using a
ServletModule
.