title: What does 'login-page="/login.jsp" login-processing-url="/login.do"' mean in Spring OAuth2 tonr?
body: <p>I am working a Oauth 2 implementation project, below is what I found in the configuration file from Spring Oauth2 tonr sample project:</p>
  
  <hr>
  
  <pre><code>&lt;http access-denied-page="/login.jsp?authorization_error=true" xmlns="http://www.springframework.org/schema/security"&gt;
      &lt;intercept-url pattern="/sparklr/**" access="ROLE_USER" /&gt;
      &lt;intercept-url pattern="/facebook/**" access="ROLE_USER" /&gt;
      &lt;intercept-url pattern="/**" access="IS_AUTHENTICATED_ANONYMOUSLY" /&gt;
  
      &lt;form-login authentication-failure-url="/login.jsp?authentication_error=true" default-target-url="/index.jsp"
          **login-page="/login.jsp"** **login-processing-url="/login.do"** /&gt;
      &lt;logout logout-success-url="/index.jsp" logout-url="/logout.do" /&gt;
      &lt;anonymous /&gt;
      &lt;custom-filter ref="oauth2ClientFilter" after="EXCEPTION_TRANSLATION_FILTER" /&gt;
  &lt;/http&gt;
  </code></pre>
  
  <hr>
  
  <p>My questions are:</p>
  
  <ol>
  <li><p>How "login-processing-url="/login.do"" get mapped? I don't see corresponding mappings in tonr</p></li>
  <li><p>What is the use of oauth2ClientFilter?</p></li>
  </ol>
  
  <p>Thanks!</p>