We will now update our integration test to provide the OAuth 2 credentials. The following test highlights the important details:

    @Test
    public void retrieveTodos() throws Exception {
      String expected = "["
      + "{id:1,user:Jack,desc:"Learn Spring MVC",done:false}" + ","
      +"{id:2,user:Jack,desc:"Learn Struts",done:false}" + "]";
      String uri = "/users/Jack/todos";
      ResourceOwnerPasswordResourceDetails resource = 
      new ResourceOwnerPasswordResourceDetails();
      resource.setUsername("user-name");
      resource.setPassword("user-password");
      resource.setAccessTokenUri(createUrl("/oauth/token"));
      resource.setClientId("clientId");
      resource.setClientSecret("clientSecret");
      resource.setGrantType("password");
      OAuth2RestTemplate oauthTemplate = new 
      OAuth2RestTemplate(resource,new 
      DefaultOAuth2ClientContext());
      ResponseEntity<String> response = 
      oauthTemplate.getForEntity(createUrl(uri), String.class);
     JSONAssert.assertEquals(expected, response.getBody(), false);
    }

Some important things to note are as follows:

• ResourceOwnerPasswordResourceDetails resource = new ResourceOwnerPasswordResourceDetails(): We set up ResourceOwnerPasswordResourceDetails with the user credentials and the client credentials
• resource.setAccessTokenUri(createUrl("/oauth/token")): Configures the URL of the authentication server
• OAuth2RestTemplate oauthTemplate = new OAuth2RestTemplate(resource,new DefaultOAuth2ClientContext()): OAuth2RestTemplate is an extension of RestTemplate, which supports the OAuth 2 protocol

In this section, we looked at how to enable OAuth 2 authentication in our resources.