java - How to shut down a Spring Boot command-line application

Java - How to shut down a Spring Boot command-line application

In a Spring Boot command-line application, you can shut down the application programmatically using the SpringApplication.exit() method. This method is used to exit the application gracefully.

Here's an example:

import org.springframework.boot.CommandLineRunner; import org.springframework.boot.ExitCodeGenerator; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class CommandLineApp implements CommandLineRunner, ExitCodeGenerator { public static void main(String[] args) { System.exit(SpringApplication.exit(SpringApplication.run(CommandLineApp.class, args))); } @Override public void run(String... args) throws Exception { // Your command-line application logic goes here // Gracefully shut down the application SpringApplication.exit(SpringApplication.run(CommandLineApp.class, args)); } @Override public int getExitCode() { return 0; } }

In this example:

  • The CommandLineApp class implements both CommandLineRunner and ExitCodeGenerator.
  • The run method contains your command-line application logic. When you decide to shut down the application, you call SpringApplication.exit() to trigger a graceful shutdown.
  • The main method uses System.exit() to set the exit code based on the result of SpringApplication.exit().

You can customize the exit code by modifying the value returned by the getExitCode method in the ExitCodeGenerator interface.

Remember that calling System.exit() may not be necessary if your application is the only one running. In some cases, the application may exit automatically once the main thread completes its execution. The example above uses System.exit() to illustrate how you can set the exit code explicitly.

Note: If you are using Spring Boot 2.3 or later, it is recommended to use SpringApplication.exit() without System.exit(). In such cases, you can remove the System.exit() line from the main method.

Examples

  1. "Java Spring Boot command-line application shutdown hook"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Register shutdown hook Runtime.getRuntime().addShutdownHook(new Thread(() -> { // Perform cleanup or additional actions on application shutdown System.out.println("Shutting down gracefully..."); })); } }
    • Description: Implements a shutdown hook using Runtime.getRuntime().addShutdownHook to perform cleanup actions when the Spring Boot command-line application is shut down.

  2. "Java Spring Boot command-line application exit method"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Manually exit the application System.exit(SpringApplication.exit(SpringApplication.run(CommandLineApp.class, args))); } }
    • Description: Uses System.exit along with SpringApplication.exit to forcefully exit the Spring Boot command-line application.

  3. "Java Spring Boot command-line application custom exit code"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Manually exit the application with a custom exit code System.exit(42); } }
    • Description: Exits the Spring Boot command-line application with a custom exit code (e.g., 42).

  4. "Java Spring Boot command-line application exit with status code"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Manually exit the application with a specific status code SpringApplication.exit(SpringApplication.run(CommandLineApp.class, args), () -> 1); } }
    • Description: Exits the Spring Boot command-line application with a specific status code (e.g., 1) using SpringApplication.exit.

  5. "Java Spring Boot command-line application shutdown gracefully with beans"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Bean public ApplicationRunner applicationRunner() { return args -> { // Application logic }; } @Bean public DisposableBean disposableBean() { return () -> { // Perform cleanup or additional actions on application shutdown System.out.println("Shutting down gracefully..."); }; } }
    • Description: Uses Spring DisposableBean to define a bean for cleanup actions when the Spring Boot command-line application is shut down.

  6. "Java Spring Boot command-line application exit on specific condition"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { @Autowired private ApplicationContext applicationContext; public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Check a specific condition if (shouldExit()) { // Manually exit the application System.exit(SpringApplication.exit(applicationContext)); } } private boolean shouldExit() { // Determine whether the application should exit return true; } }
    • Description: Exits the Spring Boot command-line application based on a specific condition using System.exit and SpringApplication.exit.

  7. "Java Spring Boot command-line application exit with error code"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { try { // Application logic } catch (Exception e) { // Log error or handle exception // Manually exit the application with an error code System.exit(1); } } }
    • Description: Exits the Spring Boot command-line application with an error code (e.g., 1) in case of an exception.

  8. "Java Spring Boot command-line application shutdown with context close"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp implements CommandLineRunner { @Autowired private ConfigurableApplicationContext context; public static void main(String[] args) { SpringApplication.run(CommandLineApp.class, args); } @Override public void run(String... args) throws Exception { // Application logic // Close the application context to trigger shutdown context.close(); } }
    • Description: Shuts down the Spring Boot command-line application by closing the application context using ConfigurableApplicationContext.close().

  9. "Java Spring Boot command-line application exit gracefully with event listener"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp { public static void main(String[] args) { SpringApplication application = new SpringApplication(CommandLineApp.class); application.addListeners(new ApplicationExitListener()); application.run(args); } @Bean public ApplicationRunner applicationRunner() { return args -> { // Application logic }; } }
    • Description: Uses a custom event listener (ApplicationExitListener) to perform cleanup actions on application shutdown.

  10. "Java Spring Boot command-line application exit with specific condition using SpringApplication"

    • Code Implementation:
      @SpringBootApplication public class CommandLineApp { public static void main(String[] args) { int exitCode = SpringApplication.exit( SpringApplication.run(CommandLineApp.class, args), () -> shouldExit() ? 0 : 1 ); System.exit(exitCode); } @Bean public ApplicationRunner applicationRunner() { return args -> { // Application logic }; } private static boolean shouldExit() { // Determine whether the application should exit gracefully return true; } }
    • Description: Uses SpringApplication.exit with a specific condition to determine whether the application should exit gracefully.

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