I am using PostgreSQL LISTEN/NOTIFY functionality in Java. So I have made a ListenerBean which is run at Application startup.

LISTENER class in java:

        public class NotificationListener extends Thread implements NotificationListenerInterface {

            private DataSource ds;

            @PersistenceContext(unitName = "one")
            EntityManager em;

            Logger logger = Logger.getLogger(NotificationListener.class);

            private Connection Conn;
            private PGConnection pgConnection = null;
            private NotifyRequest notifyRequest = null;

            public void notificationListener() throws Throwable {


                    String url = "jdbc:pgsql://192.xx.xx.126:5432/postgres";

                    Conn = DriverManager.getConnection(url,"postgres","password");
                    this.pgConnection = (PGConnection) Conn;

                    System.out.println("PG CONNECTON: "+ pgConnection);
                    Statement listenStatement = Conn.createStatement();
                    listenStatement.execute("LISTEN notify_channel");

                    pgConnection.addNotificationListener(new PGNotificationListener() {

                        public void notification(int processId, String channelName, String payload){

                            System.out.println("*********INSIDE NOTIFICATION*************");

                            System.out.println("Payload: " + jsonPayload);


So i make a PGConnection and start listening on the channel.

                listenStatement.execute("LISTEN notify_channel");

So I NOTIFY from the server when a Update of a table is done.

So when an UPDATE http request lands on my server and table is updated, I am not receiving any Notifications on my AS.

I have tested the same LISTEN/NOTIFY on PgAdmin and Notification comes when I run on Pgadmin's console LISTEN notify_channel.

Does LISTEN command goes down ?? How to check whether my Listener is up/down in Postgres ??

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.