Issue-1::Fixed NullPointerException on signup

src/main/java/com/example/api/controller/AuthenticationController.java

@@ -91,7 +91,7 @@ public ResponseEntity<?> saveUser(@RequestParam("first_name") String firstName,
         user.setPassword(new BCryptPasswordEncoder().encode(password));
         user.setRole("USER");
         user.setUserName(userName);
-        UserDetails userDetails = userDetailsService.loadUserByUsername(userName);
+        UserDetails userDetails = userDetailsService.createUserDetails(userName, user.getPassword());
         String token = jwtTokenUtil.generateToken(userDetails);
         userRepository.save(user);
         responseMap.put("error", false);

src/main/java/com/example/api/service/JwtUserDetailsService.java

@@ -28,4 +28,10 @@ public UserDetails loadUserByUsername(String username) throws UsernameNotFoundEx
         authorityList.add(new SimpleGrantedAuthority("USER_ROLE"));
         return new User(user.getUserName(), user.getPassword(), authorityList);
     }
+
+    public UserDetails createUserDetails(String username, String password) {
+        List<GrantedAuthority> authorityList = new ArrayList<>();
+        authorityList.add(new SimpleGrantedAuthority("USER_ROLE"));
+        return new User(username, password, authorityList);
+    }
 }