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Ordering of elements in DD

 
Ranch Hand
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Hi,

Do we need to follow any specific order while declaring the elements in DD?

Regards,
Vineela
 
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Hi,

For the elements directlry under the <web-app> there is no specific order as per DD for servlet 2.4. But the sub-elements under the <web-app> elements, i think the order is still specific. As per the Servlet 2.3 the order is specific.

Thanks
 
Vineela Devi
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Hi,

I have tried this.But its throwing an error when the app is deployed

<servlet-mapping>
<url-pattern>*.abc</url-pattern>
<servlet-name>BeerSelect</servlet-name>
</servlet-mapping>

<servlet>
<servlet-class>com.example.web.BeerSelect</servlet-class>
<servlet-name>BeerSelect</servlet-name>
</servlet>

and reg the ordering of the subelements I dont think there is any specific order.

Please clarify.

Regards
Vineela
 
Vishnu Prakash
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Definitely you will get error. What you had done is

Read-Before-Declaration

Only when the container is able the read the servlet name specified in <Servlet-class> element it will load the servlet class. Before loading the class how can you access it.
 
Narendra Dhande
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Hi,

Accoprding to Servlet 2.4, the subelement under web-app doesn't matter. But the order of subelement of subelement of <web-app> does matter.

I tried the following in tomcat 5.5.7

<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>*.abc</url-pattern>
</servlet-mapping>

<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>mypackage.MyServlet</servlet-class>
</servlet>

Giving me deplyment error.

I tried the same example on Sun Java App Server 8.1 UR2. There is no error, The application is running fine.

If I change the order of <url-pattern> and <servlet-name> , the application can not deply on both servers.

so Sun Java App Server 8.1 UR2 working accroding to the Servlet 2.4 specs.

Hope this help.

Thanks
 
Vineela Devi
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Hi,

I have changed interchanging the order of url-pattern and servlet-name and also sub-elements of some other elements.Those are working perfectly fine.

Iam using Tomcat 5.5


<servlet>
<servlet-name>BeerSelect</servlet-name>
<servlet-class>com.example.web.BeerSelect</servlet-class>
</servlet>

<servlet-mapping>
<url-pattern>*.abc</url-pattern>
<servlet-name>BeerSelect</servlet-name>
</servlet-mapping>

is working fine in Tomcat.



Regards,
Vineela
[ November 19, 2005: Message edited by: Vineela Devi ]
 
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