receiving null when trying to get connected user from Principal interface - spring

Question

I created some apis and I protected them using jwt, authntication part is working well and I can validate the token when I get it from the header, now I want to add some role based rules, to get them I need to pass the email information from the token to another api.
The problem is that when I try to get information from the token using Principal interface I got a null response, here is the security config :
#EnableWebSecurity(debug = true)
#EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {
#Value("${security.allowed-origin:*}")
private String allowedOriginPattern;
#Value("${spring.security.oauth2.resourceserver.jwt.jwk-set-uri}")
private String jwtSetUri;
#Bean
JwtDecoder jwtDecoder() {
NimbusJwtDecoder jwtDecoder = NimbusJwtDecoder.withJwkSetUri(jwtSetUri).build();
return jwtDecoder;
}
#Override
public void configure(HttpSecurity http) throws Exception {
http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
.and()
.authorizeRequests(authRequests - > {
// Permissions on your endpoints
authRequests.mvcMatchers(HttpMethod.OPTIONS).permitAll();
// Management endpoints
authRequests.mvcMatchers("/management/**", "/docs/**", "/webjars/**").permitAll();
// else
authRequests.anyRequest().authenticated();
});
http.oauth2ResourceServer().jwt();
http.cors()
.and()
.cors().and()
.csrf().disable()
.exceptionHandling()
.accessDeniedHandler(securityAccessDeniedHandler())
.authenticationEntryPoint(securityAuthEntryPoint());
}
#Bean
CorsConfigurationSource corsConfigurationSource() {
var corsConfiguration = new CorsConfiguration();
corsConfiguration.setAllowedHeaders(List.of("*"));
corsConfiguration.setAllowedMethods(List.of("*"));
corsConfiguration.setAllowedOriginPatterns(List.of("*"));
var source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", corsConfiguration);
return source;
}
#Bean
public AccessDeniedHandler securityAccessDeniedHandler() {
return new SecurityAccessDeniedHandler();
}
#Bean
public AuthenticationEntryPoint securityAuthEntryPoint() {
return new SecurityAuthEntryPoint();
}
}
and here is the api :
#GetMapping("/user")
public String getConnectedUser(Principal principal) {
// principal is null here
return principal.getName();
}