The spring boot login process has this error: org.springframework.security.authentication.BadCredentialsException: Bad credentials", - spring-boot

Question

I am trying to implement a login functionality, from the stored user credentials.
but it gives error as :
org.springframework.security.authentication.BadCredentialsException: Bad credentials",
note:
Password is stored encrypted in database.
Controller code:
#PostMapping("/login")
public ResponseEntity<Map<String, Object>> login(#RequestBody JwtRequest authenticationRequest) throws Exception {
String encodedPassword = this.passwordEncoder.encode( authenticationRequest.getPassword());
String userName = authenticationRequest.getUsername();
try {
authenticationManager.authenticate(
new UsernamePasswordAuthenticationToken(
userName,
encodedPassword
)
);
}catch(Exception e){
throw new CustomErrorException(
HttpStatus.INTERNAL_SERVER_ERROR,
"the authentication process has errors : "+e.toString()
);
}
final Employee emp = employeeService.findOne(authenticationRequest.getUsername());
if(emp != null){
System.out.println(" *** the employee ******** "+emp.toString());
}else{
System.out.println(" *** the employee not found ******** ");
}
final CustomeEmployee cEmp = customeEmployeeService.loadUserByUsername(authenticationRequest.getUsername());
final String token = jwtTokenUtil.generateToken(cEmp);
System.out.println("the request cam e along wy step 2");
/** -------------------------- */
ArrayNode authorities = mapper.createArrayNode();
for(GrantedAuthority authority : cEmp.getAuthorities()) {
authorities.add(authority.getAuthority());
}
Map<String, Object> result = getConfiguration(emp, cEmp);
result.put("token", token);
return ResponseEntity.ok(result);
}
Appearantly the process is not passing throug the
authenticationManager.authenticate(
new UsernamePasswordAuthenticationToken(
userName,
encodedPassword
)
);
It says the credential errors.
Note: Password and username is 100% correct.