Show custom error page after forcing logout in Liferay - liferay

Question

We have a requirement wherein I need to force logout user if some condition is met. I have written a PostLoginAction hook to check the condition and doing getSession().invalidate() when the condition is met. But after this, since there is no active session, Liferay takes me to login screen by default(prolly using a filter). If I try to redirect to one of the error pages inside /ROOT/html/common/, i get a cryptic internal server error page.
At this point, I need to display an error message but all the redirects are ending up on login page. What should be the right way of doing this?
Just on a side note, is there a way to display the error message on the login page itself instead of redirecting to some other page? I have tried using sessionErrors.add() method to achieve the same, but that too has not worked.
Let me know if you need any more details.

Answer 1

Please follow the below steps for achieving this
Create a post login event hook plugin
Create portal.properties with given props
login.events.post=com.liferay.sample.hook.LoginActionRedirect
Create entry in liferay-hook.xml
portal.properties
Create class LoginActionRedirect
package com.liferay.sample.hook;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.liferay.portal.kernel.events.Action;
import com.liferay.portal.kernel.events.ActionException;
public class LoginActionRedirect extends Action {
#Override
public void run(HttpServletRequest req, HttpServletResponse res)
throws ActionException {
System.out.println("Invalidating user");
req.getSession().invalidate();
try {
//Use page URL to be redirected
res.sendRedirect(req.getContextPath()+"/web/guest/WCM");
} catch (IOException e) {
System.out.println("Something went wrong while performing IO operations");
}
}
}
Add the following property to portal-ext.properties file,to avoid redirection with locale prepended
locale.prepend.friendly.url.style=0