adjust the user session after logging in in Liferay 7, how to get the session?

Question

In liferay 7, I am trying to adjust the user session after the login is successful. I used to build a hook for that, and it used to work just fine. But now I am unable to retrieve the session to inspect an attribute.

@Component(immediate = true, property = { "key=login.events.post" }, service = LifecycleAction.class)
public class TestSessionAdjustAction implements LifecycleAction {
@Override

public void processLifecycleEvent(LifecycleEvent lifecycleEvent) throws ActionException {
        final HttpSession session = lifecycleEvent.getSession();
        final TestAccessToken token = (TestAccessToken) session.getAttribute(TestWebkeys.TEST_ACCESS_TOKEN);
        if (token != null) {
            TestSessionUtil.put(token.getRefreshToken(), session);
        }
    }
}

The code is throwing a null pointer ex at:

session.getAttribute(TestWebkeys.TEST_ACCESS_TOKEN);

Answer 1

Poking around I fund that replacing my problematic line with

final HttpSession session = lifecycleEvent.getRequest().getSession();

solves the problem. (I hope this helps some one..cause, it took me a while)

It seems like the lifecycleEvent has in its class several constructors and the one being used here, before my method, sets the session to null...

public class LifecycleEvent {

public LifecycleEvent() {
    this(null, null, null, null);
}

public LifecycleEvent(
    HttpServletRequest request, HttpServletResponse response) {

    this(null, request, response, null);
}

public LifecycleEvent(HttpSession session) {
    this(null, null, null, session);
}

public LifecycleEvent(String[] ids) {
    this(ids, null, null, null);
}

public LifecycleEvent(
    String[] ids, HttpServletRequest request, HttpServletResponse response,
    HttpSession session) {

    _ids = ids;
    _request = request;
    _response = response;
    _session = session;
}

public String[] getIds() {
    return _ids;
}

public HttpServletRequest getRequest() {
    return _request;
}

public HttpServletResponse getResponse() {
    return _response;
}

public HttpSession getSession() {
    return _session;
}

private final String[] _ids;
private final HttpServletRequest _request;
private final HttpServletResponse _response;
private final HttpSession _session;}