Log active profiles on SpringApplication.run

Fixes gh-3766

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

@@ -64,6 +64,7 @@ import org.springframework.core.io.ResourceLoader;
 import org.springframework.core.io.support.SpringFactoriesLoader;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StopWatch;
 import org.springframework.util.StringUtils;
@@ -335,6 +336,7 @@ public class SpringApplication {
 		listeners.contextPrepared(context);
 		if (this.logStartupInfo) {
 			logStartupInfo(context.getParent() == null);
+			logStartupProfileInfo(context);
 		}
 
 		// Add boot specific singleton beans
@@ -627,6 +629,24 @@ public class SpringApplication {
 		}
 	}
 
+	/**
+	 * Called to log active profile information.
+	 * @param context the application context
+	 */
+	protected void logStartupProfileInfo(ConfigurableApplicationContext context) {
+		Log log = getApplicationLog();
+		if (log.isInfoEnabled()) {
+			String[] activeProfiles = context.getEnvironment().getActiveProfiles();
+			if (ObjectUtils.isEmpty(activeProfiles)) {
+				log.info("No profiles are active");
+			}
+			else {
+				log.info("The following profiles are active: "
+						+ StringUtils.arrayToCommaDelimitedString(activeProfiles));
+			}
+		}
+	}
+
 	/**
 	 * Returns the {@link Log} for the application. By default will be deduced.
 	 * @return the application log

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

@@ -67,6 +67,7 @@ import org.springframework.core.io.ResourceLoader;
 import org.springframework.util.StringUtils;
 import org.springframework.web.context.support.StandardServletEnvironment;
 
+import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasItem;
 import static org.hamcrest.Matchers.instanceOf;
@@ -195,6 +196,23 @@ public class SpringApplicationTests {
 				startsWith(String.format("Running a Test!%n%n123456")));
 	}
 
+	@Test
+	public void logsNoActiveProfiles() throws Exception {
+		SpringApplication application = new SpringApplication(ExampleConfig.class);
+		application.setWebEnvironment(false);
+		this.context = application.run();
+		assertThat(this.output.toString(), containsString("No profiles are active"));
+	}
+
+	@Test
+	public void logsActiveProfiles() throws Exception {
+		SpringApplication application = new SpringApplication(ExampleConfig.class);
+		application.setWebEnvironment(false);
+		this.context = application.run("--spring.profiles.active=myprofiles");
+		assertThat(this.output.toString(),
+				containsString("The following profiles are active: myprofile"));
+	}
+
 	@Test
 	public void customId() throws Exception {
 		SpringApplication application = new SpringApplication(ExampleConfig.class);