Rework breaking API changes

This commit changes the new mode-based configuration to use two new
methods – setBannerMode on SpringApplication and bannerMode on
SpringApplicationBuilder. The old methods, setShowBanner and
showBanner on SpringApplication and SpringApplicationBuilder
respectively, have been reinstated and deprecated.

Closes gh-4001

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

@@ -43,6 +43,7 @@ content into your application; rather pick only the properties that you need.
 	spring.main.sources= # sources (class name, package name or XML resource location) to include
 	spring.main.web-environment= # detect by default
 	spring.main.show-banner=true
+	spring.main.banner-mode=console # the mode used to display the banner (console, off, or log)
 	spring.main....= # see class for all properties
 
 	# AUTO-CONFIGURATION

spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -123,7 +123,7 @@ might have.
 [source,properties,indent=0,subs="verbatim,quotes,attributes"]
 ----
 	spring.main.web_environment=false
-	spring.main.show_banner=OFF
+	spring.main.banner_mode=off
 ----
 
 and then the Spring Boot banner will not be printed on startup, and the application will
@@ -139,7 +139,7 @@ consider this application
 [source,java,indent=0]
 ----
 	new SpringApplicationBuilder()
-		.showBanner(Banner.Mode.OFF)
+		.bannerMode(Banner.Mode.OFF)
 		.sources(demo.MyApp.class)
 		.run(args);
 ----
@@ -149,7 +149,7 @@ used with the following configuration:
 [source,properties,indent=0,subs="verbatim,quotes,attributes"]
 ----
 	spring.main.sources=com.acme.Config,com.acme.ExtraConfig
-	spring.main.show-banner=CONSOLE
+	spring.main.banner_mode=console
 ----
 
 The actual application will _now_ show the banner (as overridden by configuration) and use

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -93,7 +93,7 @@ instance and customize it. For example, to turn off the banner you would write:
 ----
 	public static void main(String[] args) {
 		SpringApplication app = new SpringApplication(MySpringConfiguration.class);
-		app.setShowBanner(false);
+		app.setBannerMode(Banner.Mode.OFF);
 		app.run(args);
 	}
 ----
@@ -124,7 +124,7 @@ For example:
 [source,java,indent=0]
 ----
 	new SpringApplicationBuilder()
-		.showBanner(Banner.Mode.OFF)
+		.bannerMode(Banner.Mode.OFF)
 		.sources(Parent.class)
 		.child(Application.class)
 		.run(args);

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -18,6 +18,7 @@ package org.springframework.boot;
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
+import java.io.UnsupportedEncodingException;
 import java.lang.reflect.Constructor;
 import java.security.AccessControlException;
 import java.util.ArrayList;
@@ -182,7 +183,7 @@ public class SpringApplication {
 
 	private Class<?> mainApplicationClass;
 
-	private Banner.Mode showBanner = Banner.Mode.CONSOLE;
+	private Banner.Mode bannerMode = Banner.Mode.CONSOLE;
 
 	private boolean logStartupInfo = true;
 
@@ -324,7 +325,7 @@ public class SpringApplication {
 			environment = convertToStandardEnvironment(environment);
 		}
 
-		if (this.showBanner != Banner.Mode.OFF) {
+		if (this.bannerMode != Banner.Mode.OFF) {
 			printBanner(environment);
 		}
 
@@ -524,21 +525,23 @@ public class SpringApplication {
 	 * banner.location=classpath:banner.txt, banner.charset=UTF-8. If the banner file does
 	 * not exist or cannot be printed, a simple default is created.
 	 * @param environment the environment
-	 * @see #setShowBanner(org.springframework.boot.Banner.Mode)
+	 * @see #setBannerMode
 	 */
 	protected void printBanner(Environment environment) {
 
 		Banner selectedBanner = selectBanner(environment);
 
-		if (this.showBanner == Banner.Mode.LOG) {
-			ByteArrayOutputStream baos = new ByteArrayOutputStream();
-			selectedBanner.printBanner(environment, this.mainApplicationClass,
-					new PrintStream(baos));
-			this.log.info(baos.toString());
+		if (this.bannerMode == Banner.Mode.LOG) {
+			try {
+				this.log.info(createStringFromBanner(selectedBanner, environment));
+			}
+			catch (UnsupportedEncodingException ex) {
+				this.log.warn("Failed to create String for banner", ex);
+			}
 		}
 		else {
-			selectedBanner
-					.printBanner(environment, this.mainApplicationClass, System.out);
+			selectedBanner.printBanner(environment, this.mainApplicationClass,
+					System.out);
 		}
 	}
 
@@ -557,6 +560,14 @@ public class SpringApplication {
 		return DEFAULT_BANNER;
 	}
 
+	private String createStringFromBanner(Banner banner, Environment environment)
+			throws UnsupportedEncodingException {
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		banner.printBanner(environment, this.mainApplicationClass, new PrintStream(baos));
+		String charset = environment.getProperty("banner.charset", "UTF-8");
+		return baos.toString(charset);
+	}
+
 	/**
 	 * Strategy method used to create the {@link ApplicationContext}. By default this
 	 * method will respect any explicitly set application context or application context
@@ -853,11 +864,22 @@ public class SpringApplication {
 
 	/**
 	 * Sets if the Spring banner should be displayed when the application runs. Defaults
-	 * to {@code org.springframework.boot.Banner.Mode.CONSOLE}.
-	 * @param bannerMode if the banner should be shown in log or console, or turned off.
+	 * to {@code true}.
+	 * @param showBanner if the banner should be shown
+	 * @deprecated since 1.3.0 in favor of {@link #setBannerMode}
+	 */
+	@Deprecated
+	public void setShowBanner(boolean showBanner) {
+		setBannerMode(showBanner ? Banner.Mode.CONSOLE : Banner.Mode.OFF);
+	}
+
+	/**
+	 * Sets the mode used to display the banner when the application runs. Defaults to
+	 * {@code Banner.Mode.CONSOLE}.
+	 * @param bannerMode the mode used to display the banner
 	 */
-	public void setShowBanner(Banner.Mode bannerMode) {
-		this.showBanner = bannerMode;
+	public void setBannerMode(Banner.Mode bannerMode) {
+		this.bannerMode = bannerMode;
 	}
 
 	/**

spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java

@@ -172,7 +172,7 @@ public class SpringApplicationBuilder {
 		web(false);
 
 		// Probably not interested in multiple banners
-		showBanner(Banner.Mode.OFF);
+		bannerMode(Banner.Mode.OFF);
 
 		// Make sure sources get copied over
 		this.application.setSources(this.sources);
@@ -310,12 +310,19 @@ public class SpringApplicationBuilder {
 	 * Flag to indicate the startup banner should be printed.
 	 * @param showBanner the flag to set. Default true.
 	 * @return the current builder
+	 * @deprecated Since 1.3.0 in favor of {@link #bannerMode}
 	 */
-	public SpringApplicationBuilder showBanner(Banner.Mode showBanner) {
+	@Deprecated
+	public SpringApplicationBuilder showBanner(boolean showBanner) {
 		this.application.setShowBanner(showBanner);
 		return this;
 	}
 
+	public SpringApplicationBuilder bannerMode(Banner.Mode bannerMode) {
+		this.application.setBannerMode(bannerMode);
+		return this;
+	}
+
 	/**
 	 * Sets if the application is headless and should not instantiate AWT. Defaults to
 	 * {@code true} to prevent java icons appearing.

spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java

@@ -163,19 +163,37 @@ public class SpringApplicationTests {
 	}
 
 	@Test
-	public void disableBanner() throws Exception {
+	public void disableBannerWithMode() throws Exception {
 		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
 		application.setWebEnvironment(false);
-		application.setShowBanner(Banner.Mode.OFF);
+		application.setBannerMode(Banner.Mode.OFF);
 		this.context = application.run();
 		verify(application, never()).printBanner((Environment) anyObject());
 	}
 
+	@SuppressWarnings("deprecation")
 	@Test
-	public void disableBannerViaProperty() throws Exception {
+	public void disableBannerWithBoolean() throws Exception {
 		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
 		application.setWebEnvironment(false);
-		this.context = application.run("--spring.main.show_banner=OFF");
+		application.setShowBanner(false);
+		this.context = application.run();
+		verify(application, never()).printBanner((Environment) anyObject());
+	}
+
+	@Test
+	public void disableBannerViaShowBannerProperty() throws Exception {
+		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
+		application.setWebEnvironment(false);
+		this.context = application.run("--spring.main.show_banner=false");
+		verify(application, never()).printBanner((Environment) anyObject());
+	}
+
+	@Test
+	public void disableBannerViaBannerModeProperty() throws Exception {
+		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
+		application.setWebEnvironment(false);
+		this.context = application.run("--spring.main.banner-mode=off");
 		verify(application, never()).printBanner((Environment) anyObject());
 	}
 
@@ -219,17 +237,8 @@ public class SpringApplicationTests {
 	public void enableBannerInLogViaProperty() throws Exception {
 		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
 		application.setWebEnvironment(false);
-		this.context = application.run("--spring.main.show_banner=LOG");
-		verify(application, atLeastOnce()).setShowBanner(Banner.Mode.LOG);
-	}
-
-	@Test
-	public void verifyBannerOutputContainsLogInfo() throws Exception {
-		SpringApplication application = spy(new SpringApplication(ExampleConfig.class));
-		application.setWebEnvironment(false);
-		application.run("--spring.main.show_banner=LOG",
-				"--banner.location=classpath:test-banner.txt");
-		verify(application, atLeastOnce()).setShowBanner(Banner.Mode.LOG);
+		this.context = application.run("--spring.main.banner-mode=log");
+		verify(application, atLeastOnce()).setBannerMode(Banner.Mode.LOG);
 		assertThat(this.output.toString(), containsString("o.s.boot.SpringApplication"));
 	}
 
@@ -565,8 +574,8 @@ public class SpringApplicationTests {
 		TestSpringApplication application = new TestSpringApplication(
 				ExampleConfig.class);
 		application.setWebEnvironment(false);
-		this.context = application.run("--spring.main.show_banner=OFF");
-		assertThat(application.getShowBanner(), is(Banner.Mode.OFF));
+		this.context = application.run("--spring.main.banner-mode=OFF");
+		assertThat(application.getBannerMode(), is(Banner.Mode.OFF));
 	}
 
 	@Test
@@ -733,7 +742,7 @@ public class SpringApplicationTests {
 
 		private boolean useMockLoader;
 
-		private Banner.Mode showBanner;
+		private Banner.Mode bannerMode;
 
 		TestSpringApplication(Object... sources) {
 			super(sources);
@@ -764,13 +773,13 @@ public class SpringApplicationTests {
 		}
 
 		@Override
-		public void setShowBanner(Banner.Mode bannerMode) {
-			super.setShowBanner(bannerMode);
-			this.showBanner = bannerMode;
+		public void setBannerMode(Banner.Mode bannerMode) {
+			super.setBannerMode(bannerMode);
+			this.bannerMode = bannerMode;
 		}
 
-		public Banner.Mode getShowBanner() {
-			return this.showBanner;
+		public Banner.Mode getBannerMode() {
+			return this.bannerMode;
 		}
 
 	}

spring-boot/src/test/java/org/springframework/boot/context/config/ConfigFileEnvironmentPostProcessorTests.java

@@ -88,7 +88,7 @@ public class ConfigFileEnvironmentPostProcessorTests {
 		}
 		System.clearProperty("the.property");
 		System.clearProperty("spring.config.location");
-		System.clearProperty("spring.main.showBanner");
+		System.clearProperty("spring.main.banner-mode");
 	}
 
 	@Test
@@ -624,7 +624,7 @@ public class ConfigFileEnvironmentPostProcessorTests {
 		// gh-346
 		this.initializer.setSearchNames("bindtoapplication");
 		this.initializer.postProcessEnvironment(this.environment, this.application);
-		Field field = ReflectionUtils.findField(SpringApplication.class, "showBanner");
+		Field field = ReflectionUtils.findField(SpringApplication.class, "bannerMode");
 		field.setAccessible(true);
 		assertThat((Banner.Mode) field.get(this.application), equalTo(Banner.Mode.OFF));
 	}
@@ -632,9 +632,9 @@ public class ConfigFileEnvironmentPostProcessorTests {
 	@Test
 	public void bindsSystemPropertyToSpringApplication() throws Exception {
 		// gh-951
-		System.setProperty("spring.main.showBanner", "OFF");
+		System.setProperty("spring.main.banner-mode", "off");
 		this.initializer.postProcessEnvironment(this.environment, this.application);
-		Field field = ReflectionUtils.findField(SpringApplication.class, "showBanner");
+		Field field = ReflectionUtils.findField(SpringApplication.class, "bannerMode");
 		field.setAccessible(true);
 		assertThat((Banner.Mode) field.get(this.application), equalTo(Banner.Mode.OFF));
 	}

spring-boot/src/test/resources/bindtoapplication.properties

@@ -1 +1 @@
-spring.main.show_banner=OFF
+spring.main.banner-mode=off