Fix issue where findAll endpoints would NOT respond (404 result) when a trailing slash was used. Add a single IT which proves it responds the same regardless of trailing slash or not (previously this IT failed)

dspace-server-webapp/src/main/java/org/dspace/app/rest/RestResourceController.java

@@ -961,7 +961,8 @@ public class RestResourceController implements InitializingBean {
     }
 
     /**
-     * Find all
+     * Find all via a GET request to the root endpoint. This method will trigger in cases where the called endpoint
+     * either includes a trailing slash or not.
      *
      * @param apiCategory
      * @param model
@@ -969,7 +970,7 @@ public class RestResourceController implements InitializingBean {
      * @param assembler
      * @return
      */
-    @RequestMapping(method = RequestMethod.GET)
+    @RequestMapping(method = RequestMethod.GET, value = {"", "/"})
     @SuppressWarnings("unchecked")
     public <T extends RestAddressableModel> PagedModel<DSpaceResource<T>> findAll(@PathVariable String apiCategory,
             @PathVariable String model, Pageable page, PagedResourcesAssembler assembler, HttpServletResponse response,

dspace-server-webapp/src/test/java/org/dspace/app/rest/ConfigurationRestRepositoryIT.java

@@ -51,5 +51,10 @@ public class ConfigurationRestRepositoryIT extends AbstractControllerIntegration
     public void getAll() throws Exception {
         getClient().perform(get("/api/config/properties/"))
             .andExpect(status().isMethodNotAllowed());
+
+        // Sanity check - Verify same result with no trailing slash, as DSpace should not care whether this
+        // findAll endpoint ends in a slash or not.
+        getClient().perform(get("/api/config/properties"))
+                   .andExpect(status().isMethodNotAllowed());
     }
 }