#389 - Fix Cache eviction example.

Declare SpEL path to the key property on save(…) method accepting the entity.

Original pull request: #412.

jpa/example/src/main/java/example/springdata/jpa/caching/CachingUserRepository.java

@@ -28,7 +28,7 @@ import org.springframework.data.repository.CrudRepository;
 public interface CachingUserRepository extends CrudRepository<User, Long> {
 
 	@Override
-	@CacheEvict("byUsername")
+	@CacheEvict(value="byUsername", key="#p0.username")
 	<S extends User> S save(S entity);
 
 	@Cacheable("byUsername")

jpa/example/src/test/java/example/springdata/jpa/caching/CachingRepositoryTests.java

@@ -36,13 +36,13 @@ import org.springframework.transaction.annotation.Transactional;
 @RunWith(SpringRunner.class)
 @Transactional
 @SpringBootTest
-public abstract class CachingRepositoryTests {
+public class CachingRepositoryTests {
 
 	@Autowired CachingUserRepository repository;
 	@Autowired CacheManager cacheManager;
 
 	@Test
-	public void cachesValuesReturnedForQueryMethod() {
+	public void checkCachedValue() {
 
 		User dave = new User();
 		dave.setUsername("dmatthews");
@@ -55,4 +55,17 @@ public abstract class CachingRepositoryTests {
 		Cache cache = cacheManager.getCache("byUsername");
 		assertThat(cache.get("dmatthews").get()).isEqualTo(dave);
 	}
+
+
+	@Test
+	public void checkCacheEviction() {
+
+		User dave = new User();
+		dave.setUsername("dmatthews");
+		dave = repository.save(dave);
+
+		// Verify entity evicted on cache
+		Cache cache = cacheManager.getCache("byUsername");
+		assertThat(cache.get("dmatthews")).isEqualTo(null);
+	}
 }