spring /oauth/token, AuthorizationFailureEvent -> AuthenticationSuccessEvent - spring-boot

Question

Spring Boot 2, OAuth2, and I use InMemoryTokenStore.
I have defined the following setting:
#Configuration
#EnableWebSecurity
#EnableGlobalMethodSecurity(prePostEnabled = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter
{
...
#Override
protected void configure(HttpSecurity http) throws Exception
{
http
.authorizeRequests()
.anyRequest().permitAll();
;
}
...
}
To get a token I'm making the following request:
curl Standard:Login#localhost:8080/oauth/token -d grant_type=password -d username=user -d password=passUser
Next, the following event chain occurs:
1) The first event raised is AuthorizationFailureEvent:
principal = anonymousUser
configAttributes = [fullyAuthenticated]
details = org.springframework.security.web.authentication.WebAuthenticationDetails#957e: RemoteIpAddress: 127.0.0.1; SessionId: null
exceptionClass = AccessDeniedException
source = FilterInvocation: URL: /oauth/token?username=user&password=passUser&grant_type=password
authorities = [ROLE_ANONYMOUS]
exceptionMessage = Access is denied
timestamp = 2017-12-01 14:45:34
2) Then AuthenticationSuccessEvent:
details = remoteAddress=127.0.0.1, tokenType=BearertokenValue=<TOKEN>
source = org.springframework.security.oauth2.provider.OAuth2Authentication#eb5a2d91: Principal: {
"id":" user",
"password": "****",
"authorities": ["USER"],
"firstName": "",
"lastName": "",
"accountNonExpired": "true",
"credentialsNonExpired": "true",
"accountNonLocked": "true",
"enabled": "true"
}; Credentials: [PROTECTED]; Authenticated: true; Details: remoteAddress=127.0.0.1, tokenType=BearertokenValue=<TOKEN>; Granted Authorities: "USER"
timestamp = 2017-12-01 14:45:36
3) And finally the server successfully returns a token:
{
"access_token" : "2d37dd06-0f35-441f-a851-96d145836eed",
"token_type" : "bearer",
"expires_in" : 863999,
"scope" : "all"
}
Please help me understand:
What settings should I make so that event AuthorizationFailureEvent does not occur?