Merge branch '1.5.x'

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

@@ -336,8 +336,31 @@ callbacks (such as the `DisposableBean` interface, or the `@PreDestroy` annotati
 be used.
 
 In addition, beans may implement the `org.springframework.boot.ExitCodeGenerator`
-interface if they wish to return a specific exit code when the application ends.
+interface if they wish to return a specific exit code when `SpringApplication.exit()`
+is called. This exit code can then be passed to `System.exit()` to return it as a status
+code.
 
+[source,java,indent=0]
+----
+	@SpringBootApplication
+	public class ExitCodeApplication {
+
+		public static void main(String[] args) {
+			System.exit(SpringApplication.exit(
+					SpringApplication.run(ExitCodeApplication.class, args)));
+		}
+
+		@Bean
+		public ExitCodeGenerator exitCodeGenerator(){
+			return () -> 42;
+		}
+
+	}
+----
+
+Also, the `ExitCodeGenerator` interface may be implemented by exceptions. When such an
+exception is encountered, Spring Boot will return the exit code provided by the
+implemented `getExitCode()` method.
 
 
 [[boot-features-application-admin]]