BAEL-2351 programmatically restart spring boot application

spring-boot-ops/src/main/java/com/baeldung/restart/Application.java

@@ -0,0 +1,30 @@
+package com.baeldung.restart;
+
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+
+@SpringBootApplication
+public class Application extends SpringBootServletInitializer {   
+
+    private static ConfigurableApplicationContext context;
+
+    public static void main(String[] args) {
+        context = SpringApplication.run(Application.class, args);
+    }
+
+    public static void restart() {
+        ApplicationArguments args = context.getBean(ApplicationArguments.class);
+
+        Thread thread = new Thread(() -> {
+            context.close();
+            context = SpringApplication.run(Application.class, args.getSourceArgs());
+        });
+
+        thread.setDaemon(false);
+        thread.start();
+    }
+
+}

spring-boot-ops/src/main/java/com/baeldung/restart/RestartController.java

@@ -0,0 +1,23 @@
+package com.baeldung.restart;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class RestartController {
+    
+    @Autowired
+    private RestartService restartService;
+    
+    @PostMapping("/restart")
+    public void restart() {
+        Application.restart();
+    }
+    
+    @PostMapping("/restartApp")
+    public void restartUsingActuator() {
+        restartService.restartApp();
+    }
+    
+}

spring-boot-ops/src/main/java/com/baeldung/restart/RestartService.java

@@ -0,0 +1,17 @@
+package com.baeldung.restart;
+
+import org.springframework.stereotype.Service;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.context.restart.RestartEndpoint;
+
+@Service
+public class RestartService {
+    
+    @Autowired
+    private RestartEndpoint restartEndpoint;
+    
+    public void restartApp() {
+        restartEndpoint.restart();
+    }
+
+}

spring-boot-ops/src/main/resources/application.properties

@@ -1,3 +1,4 @@
 management.endpoints.web.exposure.include=*
 management.metrics.enable.root=true
-management.metrics.enable.jvm=true
+management.metrics.enable.jvm=true
+management.endpoint.restart.enabled=true

spring-boot-ops/src/test/java/com/baeldung/restart/RestartApplicationIntegrationTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.restart;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
+
+public class RestartApplicationIntegrationTest {
+    
+    private TestRestTemplate template = new TestRestTemplate();
+
+    @Test
+    public void givenBootApp_whenRestart_thenOk() throws Exception {
+        Application.main(new String[0]);
+        
+        ResponseEntity response = template.exchange("http://localhost:8080/restart", 
+           HttpMethod.POST, null, Object.class);
+        
+        assertEquals(200, response.getStatusCode().value());
+    }
+    
+    @Test
+    public void givenBootApp_whenRestartUsingActuator_thenOk() throws Exception {
+        Application.main(new String[] { "--server.port=8090" });
+        
+        ResponseEntity response = template.exchange("http://localhost:8090/restartApp", 
+           HttpMethod.POST, null, Object.class);
+        
+        assertEquals(200, response.getStatusCode().value());
+    }
+
+}

spring-boot-ops/src/test/resources/application.properties

@@ -4,4 +4,6 @@ spring.mail.properties.mail.smtp.auth=false
 
 management.endpoints.web.exposure.include=*
 management.endpoint.shutdown.enabled=true
-endpoints.shutdown.enabled=true
+endpoints.shutdown.enabled=true
+
+management.endpoint.restart.enabled=true