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Asked: 2026-05-26T10:02:30+00:00

I encountered a J2EE project written by others. When I come to the web.xml

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I encountered a J2EE project written by others. When I come to the web.xml, there are two different servlets mapped on the same URL pattern. I wonder the purpose of this approach. How exactly does that work and what’s the puspose?

Here is the relevant part of the web.xml:

<servlet>
    <servlet-name>fileDownload</servlet-name>
    <servlet-class>com.htsoft.core.web.servlet.FileDownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>fileDownload</servlet-name>
    <url-pattern>/file-download</url-pattern>
</servlet-mapping>

<servlet>
    <servlet-name>fileDownLoad</servlet-name>
    <servlet-class>com.kaiwii.oa.action.system.FileDownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>fileDownLoad</servlet-name>
    <url-pattern>/file-downLoad</url-pattern>
</servlet-mapping>
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1 Answer

  1. Editorial Team

    Only one servlet will get called; there’s no mechanism I’m aware of for handling a single request with two servlets (nor am I sure what that would even mean).

    Servlet URL patterns may overlap, but having two with the exact same URL doesn’t make sense. I don’t recall if the servlet spec explicitly disallows it, however matching stops at the first matching. The matching method is defined in the spec.

    Servlet 2.4 spec PDF See p. 85+

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