How to start H2 TCP server on Spring Boot application startup?

Question

I\'m able to start the H2 TCP server (database in a file) when running app as Spring Boot app by adding following line into the SpringBootServletInitializer main method:

Answer 1

This solution works for me. It starts the H2 server if the app runs as Spring Boot app and also if it runs on Tomcat. Creating H2 server as a bean did not work because the Flyway bean was created earlier and failed on "Connection refused".

@SpringBootApplication
@Log
public class NatiaApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        startH2Server();
        SpringApplication.run(NatiaApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        startH2Server();
        return application.sources(NatiaApplication.class);
    }

    private static void startH2Server() {
        try {
            Server h2Server = Server.createTcpServer().start();
            if (h2Server.isRunning(true)) {
                log.info("H2 server was started and is running.");
            } else {
                throw new RuntimeException("Could not start H2 server.");
            }
        } catch (SQLException e) {
            throw new RuntimeException("Failed to start H2 server: ", e);
        }
    }
}