How to limit only one session per user and block the subsequent login attempt?

Question

The default behavior of concurrency control is to expire the original session. However, I would like to block the second user which is logging in with the same credentials with displaying message "User has already logged in". How can I accomplish this ?

Below is the configuration of spring-security.xml:

<http auto-config="false" use-expressions="true">
    <intercept-url pattern="/login*" access="permitAll"
        requires-channel="https" />
    <intercept-url pattern="/userHasLoggedIn" access="permitAll"
        requires-channel="https" />
    <intercept-url pattern="/j_spring_security_*" access="permitAll"
        requires-channel="https" />
    <intercept-url pattern="/session*" access="permitAll"
        requires-channel="https" />
    <form-login login-page="/login" authentication-failure-url="/loginFailed" />
    <intercept-url pattern="/**" access="isAuthenticated()"
        requires-channel="https" />
    <session-management invalid-session-url="/sessionExpired" session-authentication-error-url="/loginAlready">
        <concurrency-control error-if-maximum-exceeded="false" expired-url="/userHasLoggedIn" max-sessions="1"/>
    </session-management>
    <logout delete-cookies="JSESSIONID" />
</http>

(Updated) My final spring security configuration:

<http auto-config="false" use-expressions="true">
        <intercept-url pattern="/login*" access="permitAll"
            requires-channel="https" />
        <form-login default-target-url="/home" login-page="/login" authentication-failure-url="/loginFailed" />
        <intercept-url pattern="/**" access="isFullyAuthenticated()"
            requires-channel="https" />
        <session-management session-authentication-error-url="/loginFailed">
            <concurrency-control expired-url="/loginFailed" error-if-maximum-exceeded="true" max-sessions="1"/>
        </session-management>
        <logout delete-cookies="JSESSIONID" />
    </http>

Answer 1

The solution is in the documentation:

Often you would prefer to prevent a second login, in which case you can use

<http>
  ...
  <session-management>
      <concurrency-control max-sessions="1" error-if-maximum-exceeded="true" />
  </session-management>
</http>

The second login will then be rejected. By “rejected”, we mean that the user will be sent to the authentication-failure-url if form-based login is being used. If the second authentication takes place through another non-interactive mechanism, such as “remember-me”, an “unauthorized” (402) error will be sent to the client. If instead you want to use an error page, you can add the attribute session-authentication-error-url to the session-management element.

So basically set error-if-maximum-exceeded to "true" and remove expired-url attribute from <concurrency-control>.