Bael 1625 (#3831)

* shutdown boot app

* test the ctx.close()

* application shutdown test

* BAEL-1625

* /shutdown endpoint test

* bring back the closeApplication

* @Ignore shutdown endpoint test

spring-boot/src/main/java/com/baeldung/shutdown/Application.java

@@ -0,0 +1,55 @@
+package com.baeldung.shutdown;
+
+import com.baeldung.autoconfiguration.MySQLAutoconfiguration;
+import org.springframework.boot.ExitCodeGenerator;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.system.ApplicationPidFileWriter;
+import org.springframework.context.ConfigurableApplicationContext;
+
+import javax.annotation.security.RolesAllowed;
+
+@SpringBootApplication(exclude = MySQLAutoconfiguration.class)
+public class Application {
+
+    public static void main(String[] args) {
+
+        SpringApplication.run(Application.class, args);
+//        closeApplication();
+//        exitApplication();
+//        writePID();
+
+    }
+
+    private static void closeApplication() {
+
+        ConfigurableApplicationContext ctx = new SpringApplicationBuilder(Application.class).web(false).run();
+        System.out.println("Spring Boot application started");
+        ctx.getBean(TerminateBean.class);
+        ctx.close();
+    }
+
+    private static void exitApplication() {
+
+        ConfigurableApplicationContext ctx = new SpringApplicationBuilder(Application.class).web(false).run();
+
+        int exitCode = SpringApplication.exit(ctx, new ExitCodeGenerator() {
+            @Override
+            public int getExitCode() {
+                // return the error code
+                return 0;
+            }
+        });
+
+        System.out.println("Exit Spring Boot");
+
+        System.exit(exitCode);
+    }
+
+    private static void writePID() {
+        SpringApplicationBuilder app = new SpringApplicationBuilder(Application.class).web(false);
+        app.build().addListeners(new ApplicationPidFileWriter("./bin/shutdown.pid"));
+        app.run();
+    }
+}

spring-boot/src/main/java/com/baeldung/shutdown/ShutdownConfig.java

@@ -0,0 +1,15 @@
+package com.baeldung.shutdown;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.shutdown")
+public class ShutdownConfig {
+
+    @Bean
+    public TerminateBean getTerminateBean() {
+        return new TerminateBean();
+    }
+}

spring-boot/src/main/java/com/baeldung/shutdown/TerminateBean.java

@@ -0,0 +1,11 @@
+package com.baeldung.shutdown;
+
+import javax.annotation.PreDestroy;
+
+public class TerminateBean {
+
+    @PreDestroy
+    public void onDestroy() throws Exception {
+        System.out.println("Spring Container is destroyed!");
+    }
+}

spring-boot/src/main/java/com/baeldung/shutdown/shutdown/ShutdownController.java

@@ -0,0 +1,7 @@
+package com.baeldung.shutdown.shutdown;
+
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class ShutdownController {
+}