diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilder.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilder.java
index 36c7a74702..34636e1b9f 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilder.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilder.java
@@ -180,6 +180,7 @@ public class MvcUriComponentsBuilder {
 		builder.path(prefix);
 
 		String mapping = getClassMapping(controllerType);
+		mapping = (!StringUtils.hasText(prefix + mapping) ? "/" : mapping);
 		builder.path(mapping);
 
 		return builder;
@@ -280,10 +281,10 @@ public class MvcUriComponentsBuilder {
 	 * @RequestMapping("/people/{id}/addresses")
 	 * class AddressController {
 	 *
-	 *   @RequestMapping("/{country}")
+	 *   @GetMapping("/{country}")
 	 *   public HttpEntity<Void> getAddressesForCountry(@PathVariable String country) { ... }
 	 *
-	 *   @RequestMapping(value="/", method=RequestMethod.POST)
+	 *   @PostMapping
 	 *   public void addAddress(Address address) { ... }
 	 * }
 	 * </pre>
@@ -546,6 +547,9 @@ public class MvcUriComponentsBuilder {
 		if (StringUtils.hasLength(path) && !path.startsWith("/")) {
 			path = "/" + path;
 		}
+		else if (!StringUtils.hasText(prefix + path)) {
+			path = "/";
+		}
 		builder.path(path);
 
 		return applyContributors(builder, method, args);
@@ -577,11 +581,11 @@ public class MvcUriComponentsBuilder {
 		Assert.notNull(controllerType, "'controllerType' must not be null");
 		RequestMapping mapping = AnnotatedElementUtils.findMergedAnnotation(controllerType, RequestMapping.class);
 		if (mapping == null) {
-			return "/";
+			return "";
 		}
 		String[] paths = mapping.path();
 		if (ObjectUtils.isEmpty(paths) || !StringUtils.hasLength(paths[0])) {
-			return "/";
+			return "";
 		}
 		if (paths.length > 1 && logger.isTraceEnabled()) {
 			logger.trace("Using first of multiple paths on " + controllerType.getName());
@@ -597,7 +601,7 @@ public class MvcUriComponentsBuilder {
 		}
 		String[] paths = requestMapping.path();
 		if (ObjectUtils.isEmpty(paths) || !StringUtils.hasLength(paths[0])) {
-			return "/";
+			return "";
 		}
 		if (paths.length > 1 && logger.isTraceEnabled()) {
 			logger.trace("Using first of multiple paths on " + method.toGenericString());
@@ -845,7 +849,7 @@ public class MvcUriComponentsBuilder {
 		public MethodArgumentBuilder(@Nullable UriComponentsBuilder baseUrl, Class<?> controllerType, Method method) {
 			Assert.notNull(controllerType, "'controllerType' is required");
 			Assert.notNull(method, "'method' is required");
-			this.baseUrl = baseUrl != null ? baseUrl : UriComponentsBuilder.fromPath(getPath());
+			this.baseUrl = (baseUrl != null ? baseUrl : UriComponentsBuilder.fromPath(getPath()));
 			this.controllerType = controllerType;
 			this.method = method;
 			this.argumentValues = new Object[method.getParameterCount()];
@@ -854,7 +858,7 @@ public class MvcUriComponentsBuilder {
 		private static String getPath() {
 			UriComponentsBuilder builder = ServletUriComponentsBuilder.fromCurrentServletMapping();
 			String path = builder.build().getPath();
-			return path != null ? path : "";
+			return (path != null ? path : "");
 		}
 
 		public MethodArgumentBuilder arg(int index, Object value) {
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilderTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilderTests.java
index 182504eeed..f772da13ab 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilderTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilderTests.java
@@ -234,12 +234,19 @@ public class MvcUriComponentsBuilderTests {
 	}
 
 	@Test
-	public void fromMethodNameNotMapped() {
-		UriComponents uriComponents = fromMethodName(UnmappedController.class, "unmappedMethod").build();
+	public void fromMethodNameInUnmappedController() {
+		UriComponents uriComponents = fromMethodName(UnmappedController.class, "requestMappingMethod").build();
 
 		assertThat(uriComponents.toUriString()).isEqualTo("http://localhost/");
 	}
 
+	@Test // gh-29897
+	public void fromMethodNameInUnmappedControllerMethod() {
+		UriComponents uriComponents = fromMethodName(UnmappedControllerMethod.class, "getMethod").build();
+
+		assertThat(uriComponents.toUriString()).isEqualTo("http://localhost/path");
+	}
+
 	@Test
 	public void fromMethodNameWithCustomBaseUrlViaStaticCall() {
 		UriComponentsBuilder builder = UriComponentsBuilder.fromUriString("https://example.org:9090/base");
@@ -535,7 +542,16 @@ public class MvcUriComponentsBuilderTests {
 	private class UnmappedController {
 
 		@RequestMapping
-		public void unmappedMethod() {
+		public void requestMappingMethod() {
+		}
+	}
+
+
+	@RequestMapping("/path")
+	private class UnmappedControllerMethod {
+
+		@GetMapping
+		public void getMethod() {
 		}
 	}