Example of using session bean with webservices

Hello,
I am working with netbeans 5.5 (with JAX-WS 2.0 library) and using Tomcat.
I have created webservices and everything is working well so far. However, each webservice is making a connection to my database.
I would like to use a session bean so that I make the connection only once (at the begining of the client session for example) and store it into my session bean.
I am a newbie in those things, I search on the Web and on this forum some code examples. The only thing I have found is this article http://weblogs.java.net/blog/ramapulavarthi/archive/2006/06/maintaining_ses.html
When I tried this, the session doesn't seem to work at all : I get the same result (counter=1) twice.
Does anybody have a complete example of how to use a session with webservices please?
Thanks a lot!

Sorry, I was not very clear in my last message.
I need all my webservices to share the same bean during one user session.
Then, if a page calls 2 different web services, only 1 database connection is made instead of 2. And if the user opens other pages which call other webservices, they will use the connection kept into the session bean.
Anyway, I tried to do like it is said in your website but I can not build my project. I have an error : java.lang.LinkageError: JAXB 2.0 API is being loaded from the bootstrap classloader, but this RI (from jar:file:/C:/.../build/web/WEB-INF/lib/jaxb-impl.jar!/com/sun/xml/bind/v2/model/impl/ModelBuilder.class) needs 2.1 API. Use the endorsed directory mechanism to place jaxb-api.jar in the bootstrap classloader. I do not understand because I have downloaded the jax-ws 2.1.1 api and no other libraries are imported in my project. :-(
I wonder if it is not related to netbeans...

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    at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107)
    at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:381)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:71)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:63)
    at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:635)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
    at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:154)
    at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:80)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:566)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:136)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:104)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:320)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:816)
    at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1223)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:434)
    at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:161)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
    at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:464)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:200)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:172)
    at weblogic.ejb.container.deployer.EJBModule.activate(EJBModule.java:440)
    at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107)
    at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:381)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:71)
    Truncated. see log file for complete stacktrace
    class: examples.webservices.jaxws.jaxws.SayHello could not be found
    at com.sun.xml.ws.model.RuntimeModeler.getClass(RuntimeModeler.java:272)
    at com.sun.xml.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:566)
    at com.sun.xml.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:513)
    at com.sun.xml.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:358)
    at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:245)
    Truncated. see log file for complete stacktrace
    >
    <Apr 16, 2007 4:15:46 PM PDT> <Error> <Deployer> <BEA-149202> <Encountered an exception while attempting to commit the 1 task for the application '_appsdir_WL6_ear'.>
    <Apr 16, 2007 4:15:46 PM PDT> <Warning> <Deployer> <BEA-149004> <Failures were detected while initiating deploy task for application '_appsdir_WL6_ear'.>
    <Apr 16, 2007 4:15:46 PM PDT> <Warning> <Deployer> <BEA-149078> <Stack trace for message 149004
    weblogic.application.ModuleException: Exception activating module: EJBModule(WL6-ejb.jar)
    Unable to deploy EJB: SimpleEjbImpl from WL6-ejb.jar:
    Unable to deploy EJB: WL6-ejb.jar from WL6-ejb.jar:
    [HTTP:101216]Servlet: "WSEE_SERVLET" failed to preload on startup in Web application: "/SimpleEjbImpl".
    class: examples.webservices.jaxws.jaxws.SayHello could not be found
    at com.sun.xml.ws.model.RuntimeModeler.getClass(RuntimeModeler.java:272)
    at com.sun.xml.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:566)
    at com.sun.xml.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:513)
    at com.sun.xml.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:358)
    at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:245)
    at com.sun.xml.ws.server.EndpointFactory.createSEIModel(EndpointFactory.java:229)
    at com.sun.xml.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:161)
    at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:291)
    at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:315)
    at weblogic.wsee.jaxws.JAXWSServlet.registerEndpoint(JAXWSServlet.java:125)
    at weblogic.wsee.jaxws.JAXWSServlet.init(JAXWSServlet.java:64)
    at javax.servlet.GenericServlet.init(GenericServlet.java:241)
    at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:282)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(Unknown Source)
    at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:63)
    at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
    at weblogic.servlet.internal.StubLifecycleHelper.<init>(StubLifecycleHelper.java:48)
    at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:504)
    at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:1830)
    at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:1807)
    at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1727)
    at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:2890)
    at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:948)
    at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:353)
    at weblogic.wsee.deploy.WseeWebappModule.activate(WseeWebappModule.java:139)
    at weblogic.wsee.deploy.WSEEEjbModule.activate(WSEEEjbModule.java:371)
    at weblogic.wsee.deploy.WsEJBDeployListener.activate(WsEJBDeployListener.java:52)
    at weblogic.ejb.container.deployer.EJBDeployer.activate(EJBDeployer.java:1414)
    at weblogic.ejb.container.deployer.EJBModule.activate(EJBModule.java:423)
    at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107)
    at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:381)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:71)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:63)
    at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:635)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
    at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:154)
    at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:80)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:566)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:136)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:104)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:320)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:816)
    at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1223)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:434)
    at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:161)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
    at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:464)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:200)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:172)
    at weblogic.ejb.container.deployer.EJBModule.activate(EJBModule.java:440)
    at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107)
    at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:381)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:71)
    Truncated. see log file for complete stacktrace
    class: examples.webservices.jaxws.jaxws.SayHello could not be found
    at com.sun.xml.ws.model.RuntimeModeler.getClass(RuntimeModeler.java:272)
    at com.sun.xml.ws.model.RuntimeModeler.processDocWrappedMethod(RuntimeModeler.java:566)
    at com.sun.xml.ws.model.RuntimeModeler.processMethod(RuntimeModeler.java:513)
    at com.sun.xml.ws.model.RuntimeModeler.processClass(RuntimeModeler.java:358)
    at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:245)
    Truncated. see log file for complete stacktrace
    >

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