Polish "Adds support for useCodeAsDefaultMessage"

Closes gh-10466

Author: snicoll

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceProperties.java

@@ -59,7 +59,8 @@ public class MessageSourceProperties {
 	private boolean alwaysUseMessageFormat = false;
 
 	/**
-	 * Set whether to use the message code as default message instead of throwing a NoSuchMessageException.
+	 * Set whether to use the message code as default message instead of throwing a
+	 * "NoSuchMessageException". Recommended during development only.
 	 */
 	private boolean useCodeAsDefaultMessage = false;
 
@@ -110,4 +111,5 @@ public boolean isUseCodeAsDefaultMessage() {
 	public void setUseCodeAsDefaultMessage(final boolean useCodeAsDefaultMessage) {
 		this.useCodeAsDefaultMessage = useCodeAsDefaultMessage;
 	}
+
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfigurationTests.java

@@ -144,14 +144,14 @@ private boolean isAlwaysUseMessageFormat(MessageSource messageSource) {
 	}
 
 	@Test
-	public void testUseCodeAsDefaultMessageDefault() throws Exception {
+	public void testUseCodeAsDefaultMessageDefault() {
 		load("spring.messages.basename:test/messages");
 		assertThat(isUseCodeAsDefaultMessage(this.context.getBean(MessageSource.class)))
 				.isFalse();
 	}
 
 	@Test
-	public void testUseCodeAsDefaultMessageOn() throws Exception {
+	public void testUseCodeAsDefaultMessageOn() {
 		load("spring.messages.basename:test/messages",
 				"spring.messages.use-code-as-default-message:true");
 		assertThat(isUseCodeAsDefaultMessage(this.context.getBean(MessageSource.class)))

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

@@ -117,6 +117,7 @@ content into your application; rather pick only the properties that you need.
 	spring.messages.cache-seconds=-1 # Loaded resource bundle files cache expiration, in seconds. When set to -1, bundles are cached forever.
 	spring.messages.encoding=UTF-8 # Message bundles encoding.
 	spring.messages.fallback-to-system-locale=true # Set whether to fall back to the system Locale if no files for a specific Locale have been found.
+	spring.messages.use-code-as-default-message=false # Set whether to use the message code as default message instead of throwing a "NoSuchMessageException". Recommended during development only.
 
 	# OUTPUT
 	spring.output.ansi.enabled=detect # Configure the ANSI output.