Filter Mapping

[Srividhya Kiran]

Hello ranchers

Consider this code I have taken this from HFSJ chapter 13 pg no:695.

<filter-mapping>
<filter-name>Filter1</filter-name>
<url-pattern>/Recipes/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>Filter2</filter-name>
<servlet-name>/Recipes/HopsList.do</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>Filter3</filter-name>
<url-pattern>/Recipes/Add/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>Filter4</filter-name>
<servlet-name>/Recipes/Modify/ModRecipes.do</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>Filter5</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

Request path Filter Sequence
Case 1: /Recipes/HopsList.do - 1,2,5 (My answer) 1,5,2 (Book answer)
Case 2: /Recipes/Modify/ModRecipes.do - 1,4,5(My answer) 1,5,4 (Book answer)

Its given in the book that "filters with matching url-pattern are placed in the chain in the orderin which they are declared in the DD". So In my case 1,Filter 2 is declared before filter 5 so it should be placed first in the filter chain before filter 5. Correct me if I am wrong.

Thanks
Srividhya

[sudhakar karnati]

Case 1: /Recipes/HopsList.do - 1,2,5 (My answer) 1,5,2 (Book answer)
Case 2: /Recipes/Modify/ModRecipes.do - 1,4,5(My answer) 1,5,4 (Book answer)

You are considering the order of occurences of mapping elements but it is not the case. First match all the url pattern filters and then servlet mapping elements..As you can see in the book answers servlet mapping filter is the last filter in both cases..

Thanks & Regards,
Sudhakar Karnati

[Srividhya Kiran]

Thanks sudhakar I got it.

[Amruth Puppala]

I didn't get it please can you please with some more clarity please.

[Seetharaman Venkatasamy]

Originally posted by Chintu sirivennela:
I didn't get it please can you please with some more clarity please.

There are 2 ways to findout filter for the particular servlet used by the Container

one is by <url-pattern>
2nd is by <servlet-name>

    
<filter-mapping>
<filter-name>Filter1</filter-name>
<url-pattern>/Recipes/*</url-pattern>
</filter-mapping>
 
<filter-mapping>
<filter-name>Filter2</filter-name>
<servlet-name>/Recipes/*</servlet-name>
</filter-mapping>
 

--------------------------------------------------------------------
in the 2 ways container will give 1st periorty to <url-pattern>
--------------------------------------------------------------------

Hope this helps

[Amruth Puppala]

Hi seetharaman ,

Thanks so much . Now I got it.