DATACMNS-374 - Improved error handling in case of a missing Repository.

src/main/java/org/springframework/data/repository/support/Repositories.java

@@ -162,6 +162,8 @@ public <T> CrudInvoker<T> getCrudInvoker(Class<T> domainClass) {
 RepositoryInformation information = getRepositoryInformationFor(domainClass);
 Object repository = getRepositoryFor(domainClass);
 
+Assert.notNull(repository, String.format("No repository found for domain class: %s", domainClass));
+
 if (repository instanceof CrudRepository) {
 return new CrudRepositoryInvoker<T>((CrudRepository<T, Serializable>) repository);
 } else {

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

@@ -25,7 +25,9 @@
 import java.util.List;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 import org.mockito.runners.MockitoJUnitRunner;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
@@ -51,12 +53,15 @@
  * Unit tests for {@link Repositories}.
  * 
  * @author Oliver Gierke
+ * @author Thomas Darimont
  */
 @RunWith(MockitoJUnitRunner.class)
 public class RepositoriesUnitTests {
 
 ApplicationContext context;
 
+@Rule public ExpectedException exception = ExpectedException.none();
+
 @Before
 public void setUp() {
 
@@ -107,6 +112,19 @@ public void exposesPersistentEntityForDomainTypes() {
 assertThat(repositories.getPersistentEntity(Address.class), is(notNullValue()));
 }
 
+/**
+ * @see DATACMNS-374
+ */
+@Test
+public void shouldThrowMeaningfulExceptionWhenTheRepositoryForAGivenDomainClassCannotBeFound() {
+
+exception.expect(IllegalArgumentException.class);
+exception.expectMessage(containsString("No repository found for domain class: "));
+
+Repositories repositories = new Repositories(context);
+repositories.getCrudInvoker(EntityWithoutRepository.class);
+}
+
 class Person {
 
 }
@@ -115,6 +133,10 @@ class Address {
 
 }
 
+class EntityWithoutRepository {
+
+}
+
 interface PersonRepository extends CrudRepository<Person, Long> {
 
 }