Failure to look up repository metadata is now rejected with a 404 Not Found.

We now produce an HttpClientErrorException if ResourceMetadataHandlerMethodArgumentResolver fails for find metadata for a parsed repository key so that it automatically results in a 404 Not Found status code over a previous 500 Internal Server Error.

Fixes GH-2480

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/config/ResourceMetadataHandlerMethodArgumentResolver.java

@@ -24,8 +24,10 @@ import org.springframework.data.rest.core.mapping.ResourceMappings;
 import org.springframework.data.rest.core.mapping.ResourceMetadata;
 import org.springframework.data.rest.webmvc.BaseUri;
 import org.springframework.data.rest.webmvc.util.UriUtils;
+import org.springframework.http.HttpStatus;
 import org.springframework.util.Assert;
 import org.springframework.web.bind.support.WebDataBinderFactory;
+import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.method.support.ModelAndViewContainer;
@@ -86,6 +88,6 @@ public class ResourceMetadataHandlerMethodArgumentResolver implements HandlerMet
 			}
 		}
 
-		throw new IllegalArgumentException(String.format("Could not resolve repository metadata for %s.", repositoryKey));
+		throw new HttpClientErrorException(HttpStatus.NOT_FOUND);
 	}
 }

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/config/ResourceMetadataHandlerMethodArgumentResolverUnitTests.java

@@ -19,12 +19,20 @@ import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.core.MethodParameter;
 import org.springframework.data.repository.support.Repositories;
 import org.springframework.data.rest.core.mapping.ResourceMappings;
 import org.springframework.data.rest.core.mapping.ResourceMetadata;
 import org.springframework.data.rest.webmvc.BaseUri;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
+import org.springframework.web.bind.support.DefaultDataBinderFactory;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.context.request.ServletWebRequest;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.web.method.support.ModelAndViewContainer;
 
 /**
  * Unit tests for {@link ResourceMetadataHandlerMethodArgumentResolver}.
@@ -44,4 +52,29 @@ class ResourceMetadataHandlerMethodArgumentResolverUnitTests {
 
 		assertThat(resolver.supportsParameter(parameter)).isTrue();
 	}
+
+	@Test // GH-2480
+	void failedMetadataLookupResultsInNotFound() throws Exception {
+
+		var repositories = new Repositories(new DefaultListableBeanFactory());
+
+		var resolver = new ResourceMetadataHandlerMethodArgumentResolver(repositories,
+				mock(ResourceMappings.class), BaseUri.NONE);
+
+		var method = SampleController.class.getDeclaredMethod("method", ResourceMappings.class);
+		var parameter = new MethodParameter(method, 0);
+
+		var request = new MockHttpServletRequest();
+		request.setRequestURI("/some/foo");
+
+		assertThatExceptionOfType(HttpClientErrorException.class).isThrownBy(
+				() -> resolver.resolveArgument(parameter, new ModelAndViewContainer(), new ServletWebRequest(request),
+						new DefaultDataBinderFactory(new ConfigurableWebBindingInitializer())));
+	}
+
+	static class SampleController {
+
+		@GetMapping("/some/{repository}")
+		void method(ResourceMappings mappings) {}
+	}
 }