https://bz.apache.org/bugzilla/show_bug.cgi?id=64818
Bug ID: 64818
Summary: Allow duplicate URL mapping to the same Servlet
Product: Tomcat 9
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: minor
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: isa...@apache.org
Target Milestone: -----
In BZ-54387 [1] a change was made to reject "Duplicate Mapping":
> Duplicate mapping. As per clarification from the Servlet EG, deployment
> should fail.
Which makes perfect sense when the duplicate mapping points to a different
Servlet, but not so much when it points to the same Servlet. I have seen this
break deployments even in production, when a dev did not expect this seemingly
innocuous duplicate entry to break anything.
I would like to propose a minor change where we throw an
IllegalArgumentException [2] only if the duplicate entry is mapped to a
different Servlet name.
If there's no objection then I'd be happy to patch it.
[1] https://bz.apache.org/bugzilla/show_bug.cgi?id=54387
[2]
https://github.com/apache/tomcat/blob/d106b2b0305e443261704ee44fa0ce8f696d1059/java/org/apache/tomcat/util/descriptor/web/WebXml.java#L346
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