Hi,
i am new to EJB 3.0 and jboss
i am trying to create a timer with this code taken from the j2ee documentation

/**
 * TimerBean is a stateless session bean that creates a timer and prints out a
 * message when a timeout occurs.
 * Created Jan 9, 2006 3:44:08 PM
 * @author ian
 */
@Stateless
public class TimerSessionBean implements TimerSession {
 private static final Logger logger = Logger.getLogger(
 "com.sun.tutorial.javaee.ejb.timersession.TimerSessionBean");
 @Resource
 TimerService timerService;

 public void setTimer(long intervalDuration) {
 Timer timer = timerService.createTimer(
 intervalDuration,
 "Created new timer");
 }

 @Timeout
 public void timeout(Timer timer) {
 System.out.println("Timeout occurred");
 }
}

I get these errors...can someone help me?

I use the "4.5. EJB Timer Configuration" of the jboss configuraton guide

<!-- ==================================================================== -->
 <!-- J2EE Timer Service -->
 <!-- ==================================================================== -->

 <!-- An EJB Timer Service that is Tx aware -->
 <mbean code="org.jboss.ejb.txtimer.EJBTimerServiceImpl"
 name="jboss.ejb:service=EJBTimerService">
 <attribute name="RetryPolicy">jboss.ejb:service=EJBTimerService,retryPolicy=fixedDelay</attribute>
 <attribute name="PersistencePolicy">jboss.ejb:service=EJBTimerService,persistencePolicy=database</attribute>
 <attribute name="TimerIdGeneratorClassName">org.jboss.ejb.txtimer.BigIntegerTimerIdGenerator</attribute>
 <attribute name="TimedObjectInvokerClassName">org.jboss.ejb.txtimer.TimedObjectInvokerImpl</attribute>
 <depends optional-attribute-name="TransactionManagerFactory" proxy-type="org.jboss.tm.TransactionManagerFactory">
 jboss:service=TransactionManager
 </depends>
 </mbean>

 <!-- A retry policy that uses a fixed interval in milli seconds -->
 <mbean code="org.jboss.ejb.txtimer.FixedDelayRetryPolicy" name="jboss.ejb:service=EJBTimerService,retryPolicy=fixedDelay">
 <attribute name="Delay">100</attribute>
 </mbean>

 <!-- A persistence policy that does not persist the timers
 <mbean code="org.jboss.ejb.txtimer.NoopPersistencePolicy" name="jboss.ejb:service=EJBTimerService,persistencePolicy=noop"/>
 -->

 <!--
 A persistence policy that persists timers to a database.

 The 2 supported db persistence plugins are:
 org.jboss.ejb.txtimer.GeneralPurposeDatabasePersistencePlugin
 org.jboss.ejb.txtimer.OracleDatabasePersistencePlugin

 The table name defaults to "TIMERS". It can be overriden using the
 'TimersTable' attribute if the persistence plugin supports it.
 When overriding the timers table, an optional schema can be specified
 using the syntax [schema.]table
 -->
 <mbean code="org.jboss.ejb.txtimer.DatabasePersistencePolicy" name="jboss.ejb:service=EJBTimerService,persistencePolicy=database">
 <!-- DataSourceBinding ObjectName -->
 <depends optional-attribute-name="DataSource">jboss.jca:service=DataSourceBinding,name=MySqlDS</depends>
 <!-- The plugin that handles database persistence -->
 <attribute name="DatabasePersistencePlugin">org.jboss.ejb.txtimer.GeneralPurposeDatabasePersistencePlugin</attribute>
 <!-- The timers table name -->
 <attribute name="TimersTable">TIMERS</attribute>
 </mbean>

<datasources>
 <local-tx-datasource>
 <jndi-name>MySqlDS</jndi-name>
 <connection-url>jdbc:mysql://localhost:3306/bidone</connection-url>
 <driver-class>com.mysql.jdbc.Driver</driver-class>
 <user-name>root</user-name>
 <password>*******</password>
 </local-tx-datasource>
</datasources>

19:29:27,693 INFO [EJB3Deployer] Deployed: file:/home/finalsayan/Desktop/SE2/3-IMPLEMENTATION/jboss-4.2.2.GA/server/default/tmp/deploy/tmp46825BIDONE.ear-contents/BIDONEEJB.jar
19:29:27,700 INFO [TomcatDeployer] deploy, ctxPath=/BIDONEWeb, warUrl=.../tmp/deploy/tmp46825BIDONE.ear-contents/BIDONEWeb-exp.war/
19:29:27,824 INFO [EARDeployer] Started J2EE application: file:/home/finalsayan/Desktop/SE2/3-IMPLEMENTATION/jboss-4.2.2.GA/server/default/deploy/BIDONE.ear
19:29:27,845 ERROR [URLDeploymentScanner] Incomplete Deployment listing:

--- MBeans waiting for other MBeans ---
ObjectName: jboss.ejb:service=EJBTimerService,persistencePolicy=database
 State: FAILED
 Reason: java.lang.IllegalStateException: Cannot find datasource meta data: jboss.jdbc:datasource=MySqlDS,service=metadata
 I Depend On:
 jboss.jca:service=DataSourceBinding,name=MySqlDS

--- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM ---
ObjectName: jboss.ejb:service=EJBTimerService,persistencePolicy=database
 State: FAILED
 Reason: java.lang.IllegalStateException: Cannot find datasource meta data: jboss.jdbc:datasource=MySqlDS,service=metadata
 I Depend On:
 jboss.jca:service=DataSourceBinding,name=MySqlDS


19:29:27,976 INFO [Http11Protocol] Starting Coyote HTTP/1.1 on http-127.0.0.1-8080
19:29:28,105 INFO [AjpProtocol] Starting Coyote AJP/1.3 on ajp-127.0.0.1-8009
19:29:28,128 INFO [Server] JBoss (MX MicroKernel) [4.2.2.GA (build: SVNTag=JBoss_4_2_2_GA date=200710221139)] Started in 15s:276ms

thank you