Wildfly 1.0.0 singleton deployment

[lhelander]

I have tried to use the singleton-deployment feature but can not get it to work. Is there a working example available somewhere?

Do I need to add a singleton subsystem to my standalone*.xml?

[pferraro]

The standalone-ha.xml and standalone-full-ha.xml already define the "org.wildfly.extension.clustering.singleton" subsystem required for singleton deployments.  The test for this feature is here:

https://github.com/wildfly/wildfly/tree/master/testsuite/integration/clustering/src/test/java/org/jboss/as/test/clustering/cluster/singleton

To define a deployment as a singleton deployment, include a /META-INF/singleton-deployment.xml descriptor in your application archive.

Alternatively, you can add a

<singleton-deployment xmlns="urn:jboss:singleton-deployment:1.0"/>

element to your jboss-all.xml descriptor.

[lhelander]

I have created an EAR where I place the singleton-deployment.xml  rootOfEAR/META-INF directory (this is where I interpret it should be)

The EAR has 1 WAR

When I deploy the application to a cluster of two nodes the application is deployed and the included WAR started on both nodes , not just on a single node.

From the logs of the two nodes a cluster is properly established.

Do I have to use an EAR or is it possible to use a WAR without being embedded in an EAR? If so, where in the WAR should the singleton-deployment.xml be located?

On both nodes I deploy by copying the EAR to the .../standalone/deployments directory.

I have tested both with standalone-full-ha.xml and standalone-ha.xml

Any idea what I do wrong.

[pferraro]

Singleton deployments can be any type of deployment EAR, WAR, JAR, etc., except for a sub-deployment (e.g. a WAR within an EAR).  How are you starting your servers?  Are the 2 nodes on the same host? or different hosts?

[lhelander]

The nodes are on separate hosts.

The nodes are started using bin/standalone.sh -c standalone-full-ha.xml

In addition I set the ip and nodename using system properties. Other cluster functions are working using the nodes e.g. replicated infinispan caches.

For a WAR deployment, where should the singleton-deployment.xml be located?

[pferraro]

WildFly will look at the same location regardless of deployment type:

https://github.com/wildfly/wildfly/blob/10.0.0.Final/clustering/singleton/extension/src/main/java/org/wildfly/extension/clustering/singleton/deployment/SingletonDeploymentParsingProcessor.java#L49

Have you made any modifications to the default singleton or infinispan subsystems?  Since clustering seems to be working elsewhere, I'm not sure why the "server" cache container should be any different. Can you paste (via gist/pastebin/etc) your server log?

[bfraga]

I have the same problem with Wildfly 10.1.0.

Could you solve this problem?

My singleton is starting in both server.

import java.net.InetAddress;

import java.net.UnknownHostException;

import javax.ejb.ConcurrencyManagement;

import javax.ejb.ConcurrencyManagementType;

import javax.ejb.Schedule;

import javax.ejb.Singleton;

import javax.ejb.Startup;

import org.apache.logging.log4j.Level;

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)

@Startup

@Singleton

public class TesteAPP {

    final Logger logger = LogManager.getLogger(TesteAPP.class);

    @Schedule(second = "*/1", minute = "*", hour = "*", persistent = false)

    public void executaTarefa() {

        try {

            logger.log(Level.INFO, "Tarefa executada com sucesso! Nome da máquina: {} Endereço da máquina: {}",

                    InetAddress.getLocalHost().getHostName(),

                    InetAddress.getLocalHost().getHostAddress());

            System.out.println(String.format("Tarefa executada com sucesso! Nome da máquina: %s Endereço da máquina: %s",

                    InetAddress.getLocalHost().getHostName(),

                    InetAddress.getLocalHost().getHostAddress()));

        } catch (UnknownHostException e) {

            logger.log(Level.ALL, "Tarefa executada com sucesso!");

            System.out.println(String.format("Tarefa executada com sucesso!"));

        }

    }

}