How to change spring security oauth2 default token endpoint?

Question

We have spring security oauth2 based application. Every thing is working fine. But i am failed to change default token endpoint from "/oauth/token" to "/external/oauth/token".

My spring-servlet.xml

<http pattern="/external/oauth/token" create-session="stateless" 
       authentication-manager-ref="clientAuthenticationManager"
       use-expressions="true" xmlns="http://www.springframework.org/schema/security">
      <intercept-url pattern="/external/oauth/token" access="isFullyAuthenticated()" />
      <anonymous enabled="false" />
      <http-basic entry-point-ref="clientAuthenticationEntryPoint" />
      <!-- include this only if you need to authenticate clients via request parameters -->
      <custom-filter ref="clientCredentialsTokenEndpointFilter" after="BASIC_AUTH_FILTER" />
      <access-denied-handler ref="oauthAccessDeniedHandler"/>
</http>

<oauth:authorization-server client-details-service-ref="clientDetails" 
        token-services-ref="tokenServices" 
        user-approval-handler-ref="userApprovalHandler" token-endpoint-url="/external/oauth/token">
        <oauth:authorization-code />
        <oauth:implicit />
        <oauth:refresh-token />
        <oauth:client-credentials />
        <oauth:password />
</oauth:authorization-server>

But the result when i access this endpoint is

{
    error: "unauthorized"
    error_description: "An Authentication object was not found in the SecurityContext"
}

am i missing any thing ? Please suggest.

Answer 1

With the version 2.0.5.RELEASE or above of spring-security-oauth2

In one line in java based configuration, tested and works fine, somehow it's overriding the RequestMapping value of the TokenEndpoint class.

@Configuration
@EnableAuthorizationServer
protected static class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {      

        @Override
        public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
            endpoints
                .pathMapping("/oauth/token", "<your custom endpoint>")
        }
}