How to make JHipster 'hot reload' classes

Question

I'm using default generated jhipster application and I'm wondering how to make it 'hot reload' using spring-boot-devtools.

That's how I tried to start this application in 2 different ways: http://prntscr.com/a4dhmu or http://prntscr.com/a4di2c

spring-boot-devtools library is included in dev profile (just simple generated pom.xml) and my Application.class is default:

package com.testnewfeatures.app;

import com.testnewfeatures.app.config.Constants;
import com.testnewfeatures.app.config.JHipsterProperties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration;
import org.springframework.boot.actuate.autoconfigure.MetricRepositoryAutoConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration;
import org.springframework.boot.autoconfigure.liquibase.LiquibaseProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.core.env.Environment;
import org.springframework.core.env.SimpleCommandLinePropertySource;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Collection;

@ComponentScan
@EnableAutoConfiguration(exclude = { MetricFilterAutoConfiguration.class, MetricRepositoryAutoConfiguration.class, HazelcastAutoConfiguration.class })
@EnableConfigurationProperties({ JHipsterProperties.class, LiquibaseProperties.class })
public class Application {

private static final Logger log = LoggerFactory.getLogger(Application.class);

@Inject
private Environment env;

/**
 * Initializes TestNewFeatures.
 * <p/>
 * Spring profiles can be configured with a program arguments --spring.profiles.active=your-active-profile
 * <p/>
 * <p>
 * You can find more information on how profiles work with JHipster on <a href="http://jhipster.github.io/profiles.html">http://jhipster.github.io/profiles.html</a>.
 * </p>
 */
@PostConstruct
public void initApplication() throws IOException {
    if (env.getActiveProfiles().length == 0) {
        log.warn("No Spring profile configured, running with default configuration");
    } else {
        log.info("Running with Spring profile(s) : {}", Arrays.toString(env.getActiveProfiles()));
        Collection<String> activeProfiles = Arrays.asList(env.getActiveProfiles());
        if (activeProfiles.contains(Constants.SPRING_PROFILE_DEVELOPMENT) && activeProfiles.contains(Constants.SPRING_PROFILE_PRODUCTION)) {
            log.error("You have misconfigured your application! " +
                "It should not run with both the 'dev' and 'prod' profiles at the same time.");
        }
        if (activeProfiles.contains(Constants.SPRING_PROFILE_PRODUCTION) && activeProfiles.contains(Constants.SPRING_PROFILE_FAST)) {
            log.error("You have misconfigured your application! " +
                "It should not run with both the 'prod' and 'fast' profiles at the same time.");
        }
        if (activeProfiles.contains(Constants.SPRING_PROFILE_DEVELOPMENT) && activeProfiles.contains(Constants.SPRING_PROFILE_CLOUD)) {
            log.error("You have misconfigured your application! " +
                "It should not run with both the 'dev' and 'cloud' profiles at the same time.");
        }
    }
}

/**
 * Main method, used to run the application.
 */
public static void main(String[] args) throws UnknownHostException {
    SpringApplication app = new SpringApplication(Application.class);
    SimpleCommandLinePropertySource source = new SimpleCommandLinePropertySource(args);
    addDefaultProfile(app, source);
    Environment env = app.run(args).getEnvironment();
    log.info("Access URLs:\n----------------------------------------------------------\n\t" +
            "Local: \t\thttp://127.0.0.1:{}\n\t" +
            "External: \thttp://{}:{}\n----------------------------------------------------------",
        env.getProperty("server.port"),
        InetAddress.getLocalHost().getHostAddress(),
        env.getProperty("server.port"));

}

/**
 * If no profile has been configured, set by default the "dev" profile.
 */
private static void addDefaultProfile(SpringApplication app, SimpleCommandLinePropertySource source) {
    if (!source.containsProperty("spring.profiles.active") &&
            !System.getenv().containsKey("SPRING_PROFILES_ACTIVE")) {

        app.setAdditionalProfiles(Constants.SPRING_PROFILE_DEVELOPMENT);
    }
}
}

I'm doing something wrong becaus 'Hot reload' doesn't appear when I change any class.

Thanks!

Answer 1

Also according to your screenshots you use IDEA which does not auto compile classes on save by default, have you tried trigerring a build manually or the tricks below?

Intellij IDEA Java classes not auto compiling on save