Polish contribution

Closes gh-8474

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -1061,6 +1061,11 @@ public class ServerProperties
 			 */
 			private boolean renameOnRotate;
 
+			/**
+			 * Date format to place in log file name.
+			 */
+			private String fileDateFormat = ".yyyy-MM-dd";
+
 			/**
 			 * Set request attributes for IP address, Hostname, protocol and port used for
 			 * the request.
@@ -1072,11 +1077,6 @@ public class ServerProperties
 			 */
 			private boolean buffered = true;
 
-			/**
-			 * Customized date format in the access log file name.
-			 */
-			private String fileDateFormat = "yyyy-MM-dd";
-
 			public boolean isEnabled() {
 				return this.enabled;
 			}
@@ -1133,6 +1133,14 @@ public class ServerProperties
 				this.renameOnRotate = renameOnRotate;
 			}
 
+			public String getFileDateFormat() {
+				return this.fileDateFormat;
+			}
+
+			public void setFileDateFormat(String fileDateFormat) {
+				this.fileDateFormat = fileDateFormat;
+			}
+
 			public boolean isRequestAttributesEnabled() {
 				return this.requestAttributesEnabled;
 			}
@@ -1149,13 +1157,6 @@ public class ServerProperties
 				this.buffered = buffered;
 			}
 
-			public String getFileDateFormat() {
-				return fileDateFormat;
-			}
-
-			public void setFileDateFormat(String fileDateFormat) {
-				this.fileDateFormat = fileDateFormat;
-			}
 		}
 
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -168,7 +168,7 @@ public class ServerPropertiesTests {
 		bindProperties(map);
 		this.properties.customize(tomcatContainer);
 		assertThat(((AccessLogValve) tomcatContainer.getEngineValves().iterator().next())
-				.getFileDateFormat()).isEqualTo("yyyy-MM-dd");
+				.getFileDateFormat()).isEqualTo(".yyyy-MM-dd");
 	}
 
 	@Test
@@ -183,17 +183,6 @@ public class ServerPropertiesTests {
 				.getFileDateFormat()).isEqualTo("yyyy-MM-dd.HH");
 	}
 
-	@Test(expected = IllegalArgumentException.class)
-	public void tomcatAccessLogFileDateFormatWrongFormat() {
-		TomcatEmbeddedServletContainerFactory tomcatContainer = new TomcatEmbeddedServletContainerFactory();
-		Map<String, String> map = new HashMap<String, String>();
-		map.put("server.tomcat.accesslog.enabled", "true");
-		map.put("server.tomcat.accesslog.file-date-format",
-				"this-is-obviously-a-wrong-format");
-		bindProperties(map);
-		this.properties.customize(tomcatContainer);
-	}
-
 	@Test
 	public void tomcatAccessLogIsBufferedByDefault() {
 		TomcatEmbeddedServletContainerFactory tomcatContainer = new TomcatEmbeddedServletContainerFactory();

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -196,7 +196,7 @@ content into your application; rather pick only the properties that you need.
 	server.tomcat.accesslog.buffered=true # Buffer output such that it is only flushed periodically.
 	server.tomcat.accesslog.directory=logs # Directory in which log files are created. Can be relative to the tomcat base dir or absolute.
 	server.tomcat.accesslog.enabled=false # Enable access log.
-	server.tomcat.accesslog.file-date-format=yyyy-MM-dd # Customized date format in the access log file name.
+	server.tomcat.accesslog.file-date-format=.yyyy-MM-dd # Date format to place in log file name.
 	server.tomcat.accesslog.pattern=common # Format pattern for access logs.
 	server.tomcat.accesslog.prefix=access_log # Log file name prefix.
 	server.tomcat.accesslog.rename-on-rotate=false # Defer inclusion of the date stamp in the file name until rotate time.