Provide docs on migration

[soberich]

How to migrate to such kind of declaring sonfig as fu offers??
It is non-intuitive (for me)
Say having config

@Configuration
@EnableAsync
@EnableScheduling
public class AsyncConfiguration implements AsyncConfigurer {

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

    private final JHipsterProperties jHipsterProperties;

    public AsyncConfiguration(JHipsterProperties jHipsterProperties) {
        this.jHipsterProperties = jHipsterProperties;
    }

    @Override
    @Bean(name = "taskExecutor")
    public Executor getAsyncExecutor() {
        log.debug("Creating Async Task Executor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(jHipsterProperties.getAsync().getCorePoolSize());
        executor.setMaxPoolSize(jHipsterProperties.getAsync().getMaxPoolSize());
        executor.setQueueCapacity(jHipsterProperties.getAsync().getQueueCapacity());
        executor.setThreadNamePrefix("cip-old-Executor-");
        return new ExceptionHandlingAsyncTaskExecutor(executor);
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }
}

and

@Configuration
@EnableJpaRepositories("com.psg.cip.repository")
@EnableJpaAuditing(auditorAwareRef = "springSecurityAuditorAware")
@EnableTransactionManagement
@EnableElasticsearchRepositories("com.psg.cip.repository.search")
public class DatabaseConfiguration {

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

    private final Environment env;

    private final CacheManager cacheManager;

    public DatabaseConfiguration(Environment env, CacheManager cacheManager) {
        this.env = env;
        this.cacheManager = cacheManager;
    }

    /**
     * Open the TCP port for the H2 database, so it is available remotely.
     *
     * @return the H2 database TCP server
     * @throws SQLException if the server failed to start
     */
    @Bean(initMethod = "start", destroyMethod = "stop")
    @Profile(JHipsterConstants.SPRING_PROFILE_DEVELOPMENT)
    public Object h2TCPServer() throws SQLException {
        try {
            // We don't want to include H2 when we are packaging for the "prod" profile and won't
            // actually need it, so we have to load / invoke things at runtime through reflection.
            ClassLoader loader = Thread.currentThread().getContextClassLoader();
            Class<?> serverClass = Class.forName("org.h2.tools.Server", true, loader);
            Method createServer = serverClass.getMethod("createTcpServer", String[].class);
            return createServer.invoke(null, new Object[]{new String[]{"-tcp", "-tcpAllowOthers"}});

        } catch (ClassNotFoundException | LinkageError e) {
            throw new RuntimeException("Failed to load and initialize org.h2.tools.Server", e);

        } catch (SecurityException | NoSuchMethodException e) {
            throw new RuntimeException("Failed to get method org.h2.tools.Server.createTcpServer()", e);

        } catch (IllegalAccessException | IllegalArgumentException e) {
            throw new RuntimeException("Failed to invoke org.h2.tools.Server.createTcpServer()", e);

        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof SQLException) {
                throw (SQLException) t;
            }
            throw new RuntimeException("Unchecked exception in org.h2.tools.Server.createTcpServer()", t);
        }
    }

    @Bean
    public SpringLiquibase liquibase(@Qualifier("taskExecutor") TaskExecutor taskExecutor,
                                     DataSource dataSource, LiquibaseProperties liquibaseProperties) {

        // Use liquibase.integration.spring.SpringLiquibase if you don't want Liquibase to start asynchronously
        SpringLiquibase liquibase = new AsyncSpringLiquibase(taskExecutor, env);
        liquibase.setDataSource(dataSource);
        liquibase.setChangeLog("classpath:config/liquibase/master.xml");
        liquibase.setContexts(liquibaseProperties.getContexts());
        liquibase.setDefaultSchema(liquibaseProperties.getDefaultSchema());
        liquibase.setDropFirst(liquibaseProperties.isDropFirst());
        if (env.acceptsProfiles(JHipsterConstants.SPRING_PROFILE_NO_LIQUIBASE)) {
            liquibase.setShouldRun(false);
        } else {
            liquibase.setShouldRun(liquibaseProperties.isEnabled());
            log.debug("Configuring Liquibase");
        }
        return liquibase;
    }
}

how to "translate" this to fu ?