How can I run Spring with MongoDB disabled, but still installed?

Question

I was reading through this Git issue: https://github.com/spring-projects/spring-boot/issues/7589 with regards to Java Spring boot and am trying to figure out a way to bypass

Answer 1

I had the same issue. I want my application to be able to run offline as well, queue stuff and from time to time flush to database. This means it needs to be able to launch offline and connect whenever internet is available. Ofc, Spring crashed my app when it did not succeed in connecting. What worked for me was this:

@Configuration
@EnableJpaRepositories(bootstrapMode = BootstrapMode.LAZY)
public class DataSourceConfig {

@Bean(destroyMethod = "close")
public DataSource dataSource() {
    HikariConfig hikariConfig = new HikariConfig();
    hikariConfig.setDriverClassName("xxx");
    hikariConfig.setJdbcUrl("xxx");
    hikariConfig.setUsername("xxx");
    hikariConfig.setPassword("xxx");

    hikariConfig.setConnectionTestQuery("SELECT 1");
    hikariConfig.setPoolName("springHikariCP");
    hikariConfig.setInitializationFailTimeout(-1);

    hikariConfig.addDataSourceProperty("dataSource.cachePrepStmts", "true");
    hikariConfig.addDataSourceProperty("dataSource.prepStmtCacheSize", "250");
    hikariConfig.addDataSourceProperty("dataSource.prepStmtCacheSqlLimit", "2048");
    hikariConfig.addDataSourceProperty("dataSource.useServerPrepStmts", "true");
    HikariDataSource dataSource = new HikariDataSource(hikariConfig);

    return dataSource;
}

@Bean
public EntityManager entityManager() {
    return entityManagerFactory().getObject().createEntityManager();
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setDataSource(dataSource());
    em.setPackagesToScan("blabla");
    em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
    em.setJpaProperties(additionalProperties());
    return em;
}

private Properties additionalProperties() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL55Dialect");

    return properties;
}
}

Also, place this in your App class

@SpringBootApplication(exclude = HibernateJpaAutoConfiguration.class)

application.yml looks like this:

#Spring properties
spring:
  jpa:
    hibernate:
      ddl-auto: update
  datasource:
    url: "xxx"
    username: xxx
    password: xxx
    driver-class-name: com.mysql.cj.jdbc.Driver
    continue-on-error: true
  hikari:
    connection-timeout: 2000
    initialization-fail-timeout: -1
    auto-commit: true

This works for me, hopefully it will work for you guys as well, I saw many posts around here searching for a solution to this. Good luck!