How to create a top-level servlet in liferay

Question

I wanted to create a servlet in liferay that is listening to a URL such as

http://localhost:8080/my-servlet

I tried to add it to a portlet

Answer 1

If you want to access Liferay service API, you may consider using PortalDelegateServlet : adding the following to your web.xml:

    myServlet
    com.liferay.portal.kernel.servlet.PortalDelegateServlet
    
        servlet-class
        org.example.MyServlet
    
    
        sub-context
        myservlet
    

will make your servelt accessible through

http://example.org/delegate/myservlet

in your servlet class, you then do things like extract the logged-in user and check permissions:

package org.example;

public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    User user = PortalUtil.getUser(request);
    PermissionChecker permissionChecker = PermissionCheckerFactoryUtil.create(user);
    ...