Polishing.

Defer message creation. Add test.

See #3091

src/main/java/org/springframework/data/repository/core/support/AbstractRepositoryMetadata.java

@@ -41,7 +41,7 @@ import org.springframework.util.Assert;
  * @author Thomas Darimont
  * @author Jens Schauder
  * @author Mark Paluch
- * @author Konstntin Ignatyev
+ * @author Konstantin Ignatyev
  */
 public abstract class AbstractRepositoryMetadata implements RepositoryMetadata {
 
@@ -57,7 +57,8 @@ public abstract class AbstractRepositoryMetadata implements RepositoryMetadata {
 	public AbstractRepositoryMetadata(Class<?> repositoryInterface) {
 
 		Assert.notNull(repositoryInterface, "Given type must not be null");
-		Assert.isTrue(repositoryInterface.isInterface(), "Given type ["+ repositoryInterface.getName()+"] must be an interface");
+		Assert.isTrue(repositoryInterface.isInterface(),
+				() -> String.format("Given type %s must be an interface", repositoryInterface.getName()));
 
 		this.repositoryInterface = repositoryInterface;
 		this.typeInformation = TypeInformation.of(repositoryInterface);

src/test/java/org/springframework/data/repository/support/RepositoriesUnitTests.java

@@ -57,6 +57,7 @@ import org.springframework.util.ClassUtils;
  * @author Thomas Darimont
  * @author Jan Zeppenfeld
  * @author Alessandro Nistico
+ * @author Mark Paluch
  */
 @ExtendWith(MockitoExtension.class)
 @MockitoSettings(strictness = Strictness.LENIENT)
@@ -92,9 +93,17 @@ class RepositoriesUnitTests {
 		assertThat(repositories.hasRepositoryFor(Address.class)).isTrue();
 	}
 
+	@Test // GH-3091
+	void reportsOffendingTypeName() {
+		assertThatIllegalArgumentException().isThrownBy(() -> new CustomRepositoryMetadata(String.class))
+				.withMessageContaining("java.lang.String");
+	}
+
 	@Test
 	void doesNotFindInformationForNonManagedDomainClass() {
+
 		var repositories = new Repositories(context);
+
 		assertThat(repositories.hasRepositoryFor(String.class)).isFalse();
 		assertThat(repositories.getRepositoryFor(String.class)).isNotPresent();
 	}
@@ -221,13 +230,13 @@ class RepositoriesUnitTests {
 		assertRepositoryAvailableFor(repositories, Child.class, ChildRepository.class);
 	}
 
-	private void assertRepositoryAvailableFor(Repositories repositories, Class<?> domainTypem,
+	private void assertRepositoryAvailableFor(Repositories repositories, Class<?> domainType,
 			Class<?> repositoryInterface) {
 
-		assertThat(repositories.hasRepositoryFor(domainTypem)).isTrue();
+		assertThat(repositories.hasRepositoryFor(domainType)).isTrue();
-		assertThat(repositories.getRepositoryFor(domainTypem))
+		assertThat(repositories.getRepositoryFor(domainType))
 				.hasValueSatisfying(it -> assertThat(it).isInstanceOf(repositoryInterface));
-		assertThat(repositories.getRepositoryInformationFor(domainTypem))
+		assertThat(repositories.getRepositoryInformationFor(domainType))
 				.hasValueSatisfying(it -> assertThat(it.getRepositoryInterface()).isEqualTo(repositoryInterface));
 	}