Make fields immutable (final) where possible

intermediate/rest-http/src/main/java/org/springframework/integration/samples/rest/service/EmployeeSearchService.java

@@ -37,7 +37,8 @@ import org.springframework.stereotype.Service;
 @Service("employeeSearchService")
 public class EmployeeSearchService {
 
-	private static Log logger = LogFactory.getLog(EmployeeSearchService.class);
+	private static final Log logger = LogFactory.getLog(EmployeeSearchService.class);
+
 	/**
 	 * The API <code>getEmployee()</code> looks up the mapped in coming message header's id param
 	 * and fills the return object with the appropriate employee details. The return

intermediate/rest-http/src/test/java/org/springframework/integration/samples/rest/RestHttpClientTest.java

@@ -68,7 +68,7 @@ public class RestHttpClientTest {
 
 	private HttpMessageConverterExtractor<EmployeeList> responseExtractor;
 
-	private static Log logger = LogFactory.getLog(RestHttpClientTest.class);
+	private static final Log logger = LogFactory.getLog(RestHttpClientTest.class);
 
 	@Autowired
 	private Jaxb2Marshaller marshaller;