I'm no Struts expert, but my guess is that Struts adds a Servlet Mapping for anything in the context that ends in .xml.

Apache Struts 1.x, the original version of the Java EE Web application development framework, has reached the "end of life," according to the Apache Software Foundation (ASF), and is no longer ...

The Apache Software Foundation has released Struts 2.3.15.1, a security update for its popular Java Web application development framework that addresses two vulnerabilities, including a critical one ...

The Apache Software Foundation has patched a critical security vulnerability which affects all versions of Apache Struts 2. Uncovered by researchers from cybersecurity firm Semmle, the security flaw ...