Using @Service annotation in eclipse; JBoss EJB 3.0 Service

[yantriki]

I don't get any intellisence in Eclipse with the @Service and related annotations. I have JBoss IDE 1.5.0RC1 installed. I assume that intellisence probably is not implemented. However I have following questions:

Q1. I am trying to write a JBoss Service using EJB 3.0, where can I read up more on EJB 3.0 extensions to JBoss?

Q2. Does, JBoss EJB 3.0 like Service, removes the dependency on the jboss-service.xml?

I would appreciate any pointers, to where I can find more information.

[yantriki]

Please help with writing EJB 3.0 Service. I can't get it to deploy.

I wrote the following EJB 3.0 Service:

@Service(objectName = "ejb3:service=PollingService")
@Management(PollingServiceManagement.class)
public class PollingService implements PollingServiceManagement {

 Thread pollingThread = null;
 int pollingInterval = 30;
 boolean destroy;

 public int getPollInterval() {
 // TODO Auto-generated method stub
 return pollingInterval;
 }

 public void setPollInterval(int pollingInterval) {
 this.pollingInterval = pollingInterval;
 }

 // Lifecycle methods
 public void create() throws Exception {
 System.out.println("PollingService - Creating");
 pollingThread = new PollingThread();
 pollingThread.start();
 }

 public void destroy() {
 System.out.println("PollingService - Destroying");
 destroy = true;
 if(pollingThread != null && pollingThread.isAlive())
 pollingThread.interrupt();
 }

 public class PollingThread extends Thread {
 @Override
 public void run() {
 while(!destroy){
 try{
 sleep(pollingInterval*1000);
 System.out.println("Starting Poll...");
 }catch(InterruptedException ex){
 System.out.println("PollingThread interrupted: "+ex.getMessage());
 }
 }
 }
 }
}

I could not get it to deploy without the jboss-service.xml. So I created one to describe the MBean:

<?xml version="1.0" encoding="UTF-8"?>
<server>
<mbean code="org.vss.jboss.service.PollingService"
 name="ejb3:service=PollingService">
 </mbean>
</server>

I am getting the following error while trying to deploy a Service "sar" file.
---------------------------------------------------

22:23:30,000 ERROR [MainDeployer] Could not create deployment: file:/F:/java/jboss-4.0.3SP1/server/default/deploy/ejb3Service.sar
org.jboss.deployment.DeploymentException: - nested throwable: (java.lang.reflect.UndeclaredThrowableException)
 at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:178)
 at org.jboss.system.ServiceController.install(ServiceController.java:215)
 at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
 at $Proxy4.install(Unknown Source)
 at org.jboss.deployment.SARDeployer.create(SARDeployer.java:232)
 at org.jboss.deployment.MainDeployer.create(MainDeployer.java:935)
 at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:789)
 at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:753)
 at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
 at $Proxy6.deploy(Unknown Source)
 at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:319)
 at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:507)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:192)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:203)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:182)
Caused by: java.lang.reflect.UndeclaredThrowableException
 at org.jboss.system.ServiceCreator.install(ServiceCreator.java:203)
 at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:431)
 at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:153)
 ... 33 more
Caused by: java.lang.Error: Unresolved compilation problems:
 Type mismatch: cannot convert from Service to Annotation
 Management cannot be resolved to a type

 at org.vss.jboss.service.PollingService.<init>(PollingService.java:19)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
 at org.jboss.mx.server.MBeanServerImpl.instantiate(MBeanServerImpl.java:1218)
 at org.jboss.mx.server.MBeanServerImpl.instantiate(MBeanServerImpl.java:271)
 at org.jboss.mx.server.MBeanServerImpl.createMBean(MBeanServerImpl.java:329)
 at org.jboss.system.ServiceCreator.install(ServiceCreator.java:124)
 ... 35 more

[kabirkhan]

In the ejb3 distribution there are some tutorials explaining the jboss extensions with code examples. They are under docs/tutorial/index.html.

As shown in the Service tutorial (docs/tutorial/service) there is no requirement for a jboss-service.xml when deploying

[yantriki]

Kabir,
I am unable to deploy the service. When I use the extension .sar, the SARDeployer expects to find jboss-service.xml file. However, if I deploy the file as .ejb3, the service never starts,although it deploys fine. Please, also note that I have renamed the PollingService to PollingServiceMBean, but that didn't help either. I have the lifecycle methods declared in the Management interface.

I looked at the tutorial, all that is there is that the Service is packaged in the ejb3 jar, along with other EJB beans etc. So I am not getting any clue as o what to do.
Regards
Vivek

[yantriki]

Amazingly, it was the jboss-ejb3.jar file, which apparently does not have org.jboss.annotation classes available. Once I got these files from the EJB3Trail tutorial, the service deployed smoothly.

The Eclipse IDE did not show any error at all about these missing annotation classes and compiled the classes. ????

Well, I checked the current development release of JBoss 5.0 alpha and also 4.0.3SP1 and it seems like it is missing from there too. I don't know it has been refractored, nothing whatsoever is mentioned about this package anywhere.

I would appreciate if someone can shed some light on how and why these classes in org.jboss.annotation are missing from jboss-ejb3.jar. It caused me days of miseries.

[bill.burke]

they are in jboss-annotations-ejb3.jar

[yantriki]

Thanks Bill. I appreciate your help.

[lutfi123456]

is your Service tutorial application running well, yantriki? because I have some problems with

@Management(MyClass.class)

because the annotation for Management doesnt contains an argument. How can you solve that?

[yantriki]

Yes,
I have the Service tutorial running.

Following is my code:

package org.vss.jboss.service;
import org.jboss.annotation.ejb.Management;

@Management
public interface PollingServiceManagement {
 public int getPollInterval();

 public void setPollInterval(int pollingInterval);

 // Life cycle method
 public void create() throws Exception;

 public void destroy() throws Exception;

 public void start() throws Exception;

 public void stop() throws Exception;
}

Implementation code

import java.util.Date;

import org.jboss.logging.Logger;
import org.jboss.annotation.ejb.Service;
/**
 * @author VSrivastav
 *
 */
@Service(objectName = "ejb3:service=PollingService")
public class PollingService implements PollingServiceManagement {

 Thread pollingThread = null;
 int pollingInterval = 30;
 boolean destroy;
 Logger log;

 public int getPollInterval() {
 // TODO Auto-generated method stub
 return pollingInterval;
 }

 public void setPollInterval(int pollingInterval) {
 this.pollingInterval = pollingInterval;
 }

 public class PollingThread extends Thread {
 @Override
 public void run() {
 while(!destroy){
 try{
 Date d = new Date();
 log.info(d.toString()+": Sleeping for "+pollingInterval+" seconds");
 sleep(pollingInterval*1000);
 log.info("Starting Poll...");
 }catch(InterruptedException ex){
 log.info("PollingThread interrupted: "+ex.getMessage());
 }
 }
 log.info("PollingThread stopped.");
 }
 }

 public void create() throws Exception {
 log = Logger.getLogger(this.getClass());
 log.info("PollingService - Creating");
 }

 public void destroy() throws Exception {
 log.info("PollingService - Destroying");
 }

 public void start() throws Exception {
 log.info("PollingService - Starting poll thread");
 pollingThread = new PollingThread();
 pollingThread.start();
 }

 public void stop() throws Exception {
 log.info("PollingService - Stopping poll thread");
 destroy = true;
 if(pollingThread != null && pollingThread.isAlive())
 pollingThread.interrupt();
 }
}

The Service is deployed as ejb3Service.ejb3 file. It contains just a META-INF/Manifest.mf and my class files.