Issue #11791 fix suffix mapping for non default DefaultServlet usage.

jetty-ee10/jetty-ee10-servlet/src/main/java/org/eclipse/jetty/ee10/servlet/DefaultServlet.java

@@ -56,6 +56,7 @@
 import org.eclipse.jetty.util.Blocker;
 import org.eclipse.jetty.util.Callback;
 import org.eclipse.jetty.util.ExceptionUtil;
+import org.eclipse.jetty.util.StringUtil;
 import org.eclipse.jetty.util.URIUtil;
 import org.eclipse.jetty.util.resource.Resource;
 import org.eclipse.jetty.util.resource.Resources;
@@ -555,7 +556,16 @@ protected String getEncodedPathInContext(HttpServletRequest req, String included
         if (includedServletPath != null)
             return encodePath(getIncludedPathInContext(req, includedServletPath, !isDefaultMapping(req)));
         else if (!isDefaultMapping(req))
-            return encodePath(req.getPathInfo());
+        {
+            //a match via an extension mapping will more than likely
+            //have no path info
+            String path = req.getPathInfo();
+            if (StringUtil.isEmpty(path) && 
+                MappingMatch.EXTENSION.equals(req.getHttpServletMapping().getMappingMatch()))
+                path = req.getServletPath();
+
+            return encodePath(path);
+        }
         else if (req instanceof ServletApiRequest apiRequest)
             return Context.getPathInContext(req.getContextPath(), apiRequest.getRequest().getHttpURI().getCanonicalPath());
         else

jetty-ee10/jetty-ee10-servlet/src/test/java/org/eclipse/jetty/ee10/servlet/DefaultServletTest.java

@@ -3487,6 +3487,26 @@ protected void service(HttpServletRequest req, HttpServletResponse resp) throws
         assertThat(response.getContent(), containsString("testPathInfoOnly-OK"));
     }
 
+    @Test
+    public void testSuffixMappings() throws Exception
+    {
+        server.stop();
+
+        Path suffixroot = MavenTestingUtils.getTestResourcePath("suffixroot");
+        ResourceFactory resourceFactory = ResourceFactory.of(context);
+        context.setBaseResource(resourceFactory.newResource(suffixroot.toUri()));
+
+        ServletHolder holderAlt = new ServletHolder("static-js", DefaultServlet.class);
+        context.addServlet(holderAlt, "*.js");
+        ServletHolder holderDef = new ServletHolder("default", DefaultServlet.class);
+        holderDef.setInitParameter("dirAllowed", "true");
+        context.addServlet(holderDef, "/");
+
+        server.start();
+        String rawResponse = connector.getResponse("GET /context/test.js HTTP/1.0\r\n\r\n");
+        assertThat(rawResponse, containsString("Hello"));
+    }
+
     @Test
     public void testMemoryResourceRange() throws Exception
     {

jetty-ee10/jetty-ee10-servlet/src/test/resources/suffixroot/test.js

@@ -0,0 +1 @@
+document.write("Hello");