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Mitigate duplicate URL mapping [message #1848549]

Tue, 07 December 2021 14:42

ilan stuer

Messages: 2
Registered: August 2021

Junior Member

I've an error in eclipse stating that a duplicate URL mapping was found for a project.
This is caused by a jar dependency which has mapped a servlet using @WebServlet annotation. The project that imports this jar needs to overwrite the servlet mapping with a custom class but it needs the same url mapping. To achieve this the project configures the servlet mapping in web.xml.

I figure this works because xml configuration takes precedence over the annotations, but would it be possible to mitigate this error without disabling web.xml validation entirely?

Or is this a valid error which could cause issues on certain application servers?
I'm using jboss and wildfly where I've not had any runtime issues.

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Re: Mitigate duplicate URL mapping [message #1848580 is a reply to message #1848549]

Wed, 08 December 2021 15:43

Nitin Dahyabhai

Messages: 4438
Registered: July 2009

Senior Member

That's odd. The Servlet 4.0 spec in section 12.2 states "If the effective web.xml (after merging information from fragments and
annotations) contains any url-patterns that are mapped to multiple servlets then the deployment must fail." Does it work in Tomcat?

_
Nitin Dahyabhai
Eclipse Web Tools Platform

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Re: Mitigate duplicate URL mapping [message #1848631 is a reply to message #1848580]

Fri, 10 December 2021 10:19

ilan stuer

Messages: 2
Registered: August 2021

Junior Member

I did some testing and this also works on tomcat 9.
I also noticed that this error in eclipse doesn't occur for maven projects but only for ant and ivy projects.

The eclipse version I'm using is still 2019-12 (4.14.0) so I'm going to test this on the latest version to verify that this is a bug.

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Re: Mitigate duplicate URL mapping [message #1848688 is a reply to message #1848631]

Tue, 14 December 2021 04:27

Nitin Dahyabhai

Messages: 4438
Registered: July 2009

Senior Member

Please be sure to include the dynamic web facet version if you do report it as a bug. I haven't dug into the details,
but it could matter.

_
Nitin Dahyabhai
Eclipse Web Tools Platform

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Re: Mitigate duplicate URL mapping [message #1854210 is a reply to message #1848688]

Sun, 07 August 2022 04:00

BEND KAI

Messages: 1
Registered: August 2022

Junior Member

What is the possible solution for this duplication issue. I am also facing similar kind of issues right know.

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[Updated on: Mon, 08 August 2022 05:06]

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