Improvement for Spring Boot Exit Codes

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/exitcode/exceptionexitgen/ExceptionExitCodeGeneratorApplication.java

@@ -0,0 +1,21 @@
+package com.baeldung.exitcode.exceptionexitgen;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class ExceptionExitCodeGeneratorApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ExceptionExitCodeGeneratorApplication.class, args);
+    }
+
+    @Bean
+    CommandLineRunner failApplication() {
+        return args -> {
+            throw new FailedToStartException();
+        };
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/exitcode/exceptionexitgen/FailedToStartException.java

@@ -0,0 +1,11 @@
+package com.baeldung.exitcode.exceptionexitgen;
+
+import org.springframework.boot.ExitCodeGenerator;
+
+public class FailedToStartException extends RuntimeException implements ExitCodeGenerator {
+
+    @Override
+    public int getExitCode() {
+        return 127;
+    }
+}