SecurityContextHolder.getContext().getAuthentication() is null

Question

I am working on the Spring boot rest API with JWT Token to authenticate the requests. I have made multiple entries of Admin in DB and passing name as username, password as password in Basic Auth, but ends up getting SecurityContextHolder.getContext().getAuthentication() as null.

@PostMapping("/admins/login")
    public ResponseEntity<Admin> getLoggedInAdminDetailsHandler(Authentication auth) {
        Admin admin = adminDao.findByEmail(auth.getName())
                .orElseThrow(() -> new BadCredentialsException("Invalid Username or password"));
        return new ResponseEntity<>(admin, HttpStatus.ACCEPTED);
    }

with Configuration as :

package com.olivestays.config;


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

@Configuration
public class AppConfig {

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

        http
        .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
        .and()
        .csrf().disable()
        .authorizeHttpRequests()
        .requestMatchers(HttpMethod.POST, "/staywell/customers/register").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/admins/register").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/hotels/register").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/customers/login").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/admins/login").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/hotels/login").permitAll()
        .requestMatchers(HttpMethod.POST, "/staywell/rooms/add").hasRole("HOTEL")
        .requestMatchers(HttpMethod.PUT, "/staywell/customers/update").hasRole("CUSTOMER")
        .requestMatchers(HttpMethod.GET, "/staywell/customers/getToBeDeletedAccounts").hasRole("ADMIN")
        .anyRequest()
        .authenticated()
        .and()
        .addFilterAfter(new JwtTokenGeneratorFilter(), BasicAuthenticationFilter.class)
        .addFilterBefore(new JwtTokenValidatorFilter(), BasicAuthenticationFilter.class)
        .formLogin()
        .and()
        .httpBasic();

        return http.build();

    }

    @Bean
    public PasswordEncoder passwordEncoder() {

        return new BCryptPasswordEncoder();

    }

}

I have made multiple entries in DB for Admin, and when I am passing Username and Password in Basic Auth, it is showing 401 Unauthorized.

Admin request:

package com.olivestays.model;



import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonProperty.Access;
import com.olivestays.enums.Role;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.EnumType;
import jakarta.persistence.Enumerated;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.validation.constraints.Email;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotEmpty;
import jakarta.validation.constraints.NotNull;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
public class Admin {

    @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @JsonProperty(access = Access.READ_ONLY)
    private Integer adminId;

    @NotNull @NotEmpty @NotBlank
    private String name;

    @NotNull @NotEmpty @NotBlank
    @Column(unique = true) @Email
    private String email;

    @NotNull @NotEmpty @NotBlank
    private String mobile;

    @NotNull @NotEmpty @NotBlank
    @JsonProperty(access = Access.WRITE_ONLY)
    private String password;

    @JsonIgnore
    @Enumerated(EnumType.STRING)
    private Role role;
    
}

What should I do to resolve this issue?