Move server.display-name configuration property

The `server.display-name` configuration property is used to configure
the application display name for Servlet-based applications.

This commit moves that property to:
`server.servlet.application-display-name` and keeps the same defaults.

Closes gh-8624

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

@@ -68,11 +68,6 @@ public class ServerProperties {
 	 */
 	private InetAddress address;
 
-	/**
-	 * Display name of the application.
-	 */
-	private String displayName = "application";
-
 	@NestedConfigurationProperty
 	private final ErrorProperties error = new ErrorProperties();
 
@@ -131,14 +126,6 @@ public class ServerProperties {
 		this.address = address;
 	}
 
-	public String getDisplayName() {
-		return this.displayName;
-	}
-
-	public void setDisplayName(String displayName) {
-		this.displayName = displayName;
-	}
-
 	public Boolean isUseForwardHeaders() {
 		return this.useForwardHeaders;
 	}
@@ -222,6 +209,11 @@ public class ServerProperties {
 		 */
 		private String contextPath;
 
+		/**
+		 * Display name of the application.
+		 */
+		private String applicationDisplayName = "application";
+
 		/**
 		 * Path of the main dispatcher servlet.
 		 */
@@ -248,6 +240,14 @@ public class ServerProperties {
 			return contextPath;
 		}
 
+		public String getApplicationDisplayName() {
+			return this.applicationDisplayName;
+		}
+
+		public void setApplicationDisplayName(String displayName) {
+			this.applicationDisplayName = displayName;
+		}
+
 		public String getPath() {
 			return this.path;
 		}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/DefaultServletWebServerFactoryCustomizer.java

@@ -74,7 +74,7 @@ public class DefaultServletWebServerFactoryCustomizer
 		map.from(this.serverProperties::getAddress).to(factory::setAddress);
 		map.from(this.serverProperties.getServlet()::getContextPath)
 				.to(factory::setContextPath);
-		map.from(this.serverProperties::getDisplayName).to(factory::setDisplayName);
+		map.from(this.serverProperties.getServlet()::getApplicationDisplayName).to(factory::setDisplayName);
 		map.from(this.serverProperties.getServlet()::getSession).to(factory::setSession);
 		map.from(this.serverProperties::getSsl).to(factory::setSsl);
 		map.from(this.serverProperties::getServlet).as(ServerProperties.Servlet::getJsp)

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -977,6 +977,16 @@
         "level": "error"
       }
     },
+    {
+      "name" : "server.display-name",
+      "type" : "java.lang.String",
+      "description" : "Display name of the application.",
+      "defaultValue" : "application",
+      "deprecation" : {
+        "replacement" : "server.servlet.application-display-name",
+        "level" : "error"
+      }
+    },
     {
       "name": "server.jsp-servlet.class-name",
       "type": "java.lang.String",

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/DefaultServletWebServerFactoryCustomizerTests.java

@@ -216,7 +216,7 @@ public class DefaultServletWebServerFactoryCustomizerTests {
 	public void testCustomizeDisplayName() {
 		ConfigurableServletWebServerFactory factory = mock(
 				ConfigurableServletWebServerFactory.class);
-		this.properties.setDisplayName("TestName");
+		this.properties.getServlet().setApplicationDisplayName("TestName");
 		this.customizer.customize(factory);
 		verify(factory).setDisplayName("TestName");
 	}
@@ -281,7 +281,7 @@ public class DefaultServletWebServerFactoryCustomizerTests {
 	@Test
 	public void customizeTomcatDisplayName() {
 		Map<String, String> map = new HashMap<>();
-		map.put("server.display-name", "MyBootApp");
+		map.put("server.servlet.application-display-name", "MyBootApp");
 		bindProperties(map);
 		TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
 		this.customizer.customize(factory);

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

@@ -165,7 +165,6 @@ content into your application. Rather, pick only the properties that you need.
 	server.compression.mime-types=text/html,text/xml,text/plain,text/css,text/javascript,application/javascript # Comma-separated list of MIME types that should be compressed.
 	server.compression.min-response-size=2048 # Minimum response size that is required for compression to be performed.
 	server.connection-timeout= # Time that connectors wait for another HTTP request before closing the connection. When not set, the connector's container-specific default is used. Use a value of -1 to indicate no (that is, an infinite) timeout.
-	server.display-name=application # Display name of the application.
 	server.error.include-exception=false # Include the "exception" attribute.
 	server.error.include-stacktrace=never # When to include a "stacktrace" attribute.
 	server.error.path=/error # Path of the error controller.
@@ -192,6 +191,7 @@ content into your application. Rather, pick only the properties that you need.
 	server.use-forward-headers= # Whether X-Forwarded-* headers should be applied to the HttpRequest.
 	server.servlet.context-parameters.*= # Servlet context init parameters
 	server.servlet.context-path= # Context path of the application.
+	server.servlet.application-display-name=application # Display name of the application.
 	server.servlet.jsp.class-name=org.apache.jasper.servlet.JspServlet # The class name of the JSP servlet.
 	server.servlet.jsp.init-parameters.*= # Init parameters used to configure the JSP servlet.
 	server.servlet.jsp.registered=true # Whether the JSP servlet is registered.