filter dispatcher doubt

[Raju Sri]

Hi ranchers,

In which case MyFilter in the below web.xml configuration will trigger ?

<filter-mapping>
<filter-name>MyFilter</filter-name>
<servlet-name>HelloServlet</servlet-name>
<dispatcher>ERROR</dispatcher>
</filter-mapping>

I tested dispatcher with REQUEST,INCLUDE and FORWARD by calling HelloSevlet from diffent servlet using requestDispatcher.They are working fine.

I tried to test dispatcher with ERROR in the web.xml and couldn't able to test. I configured web.xml with error-page and changed my HelloServlet to throw Exception but the MyFilter never triggered when there is an error.

Pls let me know how to test ?

Regards

[V Sharma]

I tried to test dispatcher with ERROR in the web.xml and couldn't able to test. I configured web.xml with error-page and changed my HelloServlet to throw Exception but the MyFilter never triggered when there is an error.

I think HelloServlet should be catching the exception. The called to the filter will be made in case Servlet is invoked by means of error thrown mechanism from some other servlet.

<filter>
<filter-name>HelloWorldFilter</filter-name>
<filter-class>com.TestHelloWorldFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HelloWorldFilter</filter-name>
<servlet-name>HelloWorldServ</servlet-name>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
<filter-mapping>
<filter-name>HelloWorldFilter</filter-name>
<servlet-name>TestErrorDispServ</servlet-name>
<dispatcher>ERROR</dispatcher>
</filter-mapping>

<error-page>
<exception-type>java.lang.ClassCastException</exception-type>
<location>/servlet/TestErrorDispServ</location>
</error-page>

Hope this helps.

[Raju Sri]

Hi Victor,

I used the web.xml like below and it is working fine.I tested this with another servlet which throws IOException. Thanks for your help.
##############################################################
<filter-mapping>
<filter-name>MyFilter</filter-name>
<servlet-name>HelloServlet</servlet-name>
<dispatcher>ERROR</dispatcher>
</filter-mapping>

<error-page>
<exception-type>java.lang.IOException</exception-type>
<location>/HelloServlet</location>
</error-page>
##############################################################

Cheers