在配置AuthenticationManager时，避免递归调用。

示例代码：

@Configuration @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
private UserDetailsService userDetailsService;

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
    auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
}

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

}

在此示例中，UserDetailsService对象被注入到AuthenticationManagerBuilder中。如果UserDetailsService与AuthenticationManagerBuilder互相注入，就会出现递归调用的情况，进而导致StackOverflowError错误。因此，应该避免这种情况的发生。