Setting up in-memory H2 database without Spring Boot

You can add the DataSource bean using the EmbeddedDatabaseBuilder as follows:

@Bean
public DataSource dataSource(
        @Value("${datasource.dbname}") String dbname,
        @Value("${datasource.script}") String script) {

    return new EmbeddedDatabaseBuilder()
            .setType(EmbeddedDatabaseType.H2)
            .setName(dbname)
            .addScript(script)
            .build();
}

application.properties

datasource.dbname=users
datasource.script=classpath:resources/users.sql

Also you can register h2-console servlet in the application configuration class as follows:

@Configuration
public class WebAppConfig implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext servletContext) {
        . . .

        servletContext
                .addServlet("H2Console", WebServlet.class)
                .addMapping("/console/*");

        . . .
    }
}

Then you can open http://localhost:8080/console and connect to the jdbc:h2:mem:users database as follows:

^{See also How to enable h2-console in spring-webmvc without spring-boot?}