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Order Of Elements in Deployment Descriptor.

 
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Hi,
I wrote the mock exam in javaranch I found a question
<web-app>
<servlet>
.....
</servlet>
<listener>
<listener-class>com.javaranch.LogListener</listener-class>
</listener>
</web-app>

The above entry in the Deployment Descriptor(DD) will result in which of the following?

I selected the answer that a new listener class will be registered, but they gave the answer like this DD is wrong and the reason is "The ordering of the DD is listener then servlet." . Is it true? listeners should come first and then servlets? Please explain me.
 
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The ordering for the top level elements really dosn't matter with the 2.4 version of the DTD.
 
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This mock is for version 2.3. It is not true anymore, as the ordering does not matter.
 
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