[Sugestão] Codigo para versao 6 do Spring Security

Na parte de criar os usuarios:

@Configuration
@EnableWebSecurity
public class WebSecurityConfig{

    @Autowired
    private DataSource dataSource;

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception{

        http
            .authorizeHttpRequests()
                .anyRequest().authenticated()
            .and()
                .formLogin(form -> form
                    .loginPage("/login")
                    .defaultSuccessUrl("/home",true)
                    .permitAll())
                .logout(logout -> logout.logoutUrl("/logout"));

        return http.build();
    }

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Bean
    public JdbcUserDetailsManager users(PasswordEncoder encoder){
        UserDetails user = 
                        User.builder()
                            .username("joao")
                            .password(encoder.encode("joao"))
                            .roles("ADM")
                            .build();
        JdbcUserDetailsManager jdbcUserDetailsManager = new JdbcUserDetailsManager(dataSource);
        jdbcUserDetailsManager.createUser(user);
        return jdbcUserDetailsManager;
    }

}

Após criar usuarios

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.authorizeHttpRequests()
                .anyRequest().authenticated()
                .and()
                .formLogin(form -> 
                    form
                        .loginPage("/login")
                        .defaultSuccessUrl("/home", true)
                        .permitAll()
                )
                .logout(logout -> logout.logoutUrl("/logout"));

        return http.build();
    }

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Bean
    public UserDetailsManager users(DataSource dataSource) {
        JdbcUserDetailsManager users = new JdbcUserDetailsManager(dataSource);
        return users;
    }
}