Embedding Jetty Server with Jersey as RESTful container with CORS

Imported from Medium: https://medium.com/@aruny/embedding-jetty-server-with-jersey-as-restful-container-with-cors-a3ea3c5381c9

I came across a scenario where I had to expose a Java SDK based server configuration as RESTFul service. I chose the jetty as embedded http server and jersey as RESTful container. After Googling a while I came across this link which nicely explains how to embed a jetty server in a java programme.

However I also wanted this service available to other web application using CORS. So I wanted to enable jettty CORS filter for the same. After Googling again for a while I came across this link.

Merging idea from above two links finally made a working version of embedded jettey with Jersey supporting CORS.

ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);

context.setContextPath(“/”); 
Server jettyServer = new Server(Integer.parseInt(9998));

jettyServer.setHandler(context);

ServletHolder jerseyServlet = context.addServlet( org.glassfish.jersey.servlet.ServletContainer.class, “/*”);

jerseyServlet.setInitOrder(0);

jerseyServlet.setInitParameter( “jersey.config.server.provider.classnames”,

MyServerConfig.class.getCanonicalName());

FilterHolder filterHolder = context.addFilter(org.eclipse.jetty.servlets.CrossOriginFilter
.class, “/*”, EnumSet.of(DispatcherType.REQUEST));

filterHolder.setInitParameter(“allowedOrigins”, “*”);

try { 
   jettyServer.start(); jettyServer.join(); 
} catch (Exception e) { 
   LOGGER.error(“Error running ServerConfig service”, e); 
} finally {
   jettyServer.destroy();
}

Here “MyServerConfig.class” is resource class implementing RESTFul service.

One can now access http://localhost:9998/