Stateful session bean store module in EJB?

Similar Questions

• Alternative for stateful session bean and timer service

  Hello
  
  I need to write EJB3.0 service that gathers information from network routers (using the SNMP protocol) every 5 seconds. The ideal solution is to have a number of stateful session beans - each representative a connection with different router. (Stateful EJB holds router IP, port, and other properties necessary to communicate via SNMP). It's easy. Worse is how to force stateful bean to send the request every 5 seconds? As I mentioned earlier, the ideal solution would be to use EJB stateful with timer, but which is forbidden by the EJB specification. Is there a j2ee model solve this problem? I also thought using JMS, MessageDrivenBean cannot hold any conversational State, so this does not solve my problem (EJB so that the stateless person does not work).
  
  Thank you in advance,
  Piotr

  Well first you do the upgrade to JBoss as JBoss 5.1GA 5.0 and 5.01 are far from stable. You should not get any problem to do the upgrade.

  If you have specific needs of other programming that "do this every time X ' then the Scheduler will not really cut. Quartz is more flexible in this regard, so you could investigate that.

  I have myself developed a calendar service on top of JBoss Scheduler however; you could do something similar (I can't share because I do not have the code). JBoss Planner tells the service of every X minutes check calendar's calendar events that need to be pulled. These events are simply stored in the database and the logic is flexible enough to be able to invoke events once, continuously (whenever the calendar service is called), or at specific intervals (every hour, every day, every day of the week).

  Let's take an example. I have an event that triggers every day at 2:00 pm - so the date field would be set today at December 29, 2010 at 14:00. The calendar service is run by the Scheduler of JBoss at 14:01 and decided to raise this event (active events that are less than 48 hours will be triggered to deal with downtime of server). After that he did his thing, the service updates the event date field by combining the current real date and time of the event and adding 24 hours.

  Still the problem of what to invoke when an event is triggered. In my case, I use JMS here; records of the event have a queue name field to which the service sends a generic object message. I can then implement application specific multilateral development banks that take this message and act on it.

• Access EJB session bean in JSF managed bean

  Components of the project: Weblogic 11 G + 12 c, 12 c EJB3 JPA 2 Jdeveloper-ADF

  I need to access EJB session bean in JSF managed bean and some methods of execution by program

  Work method and return EJB below
  Is this fair? Another way

  public static Object getEjbForDataControl (String name) {}
  BindingContainer DCBindingContainer = (DCBindingContainer) BindingContext.getCurrent () .getCurrentBindingsEntry ();
  DCDataControl cDataControl = bindingContainer.findDataControl (name);
  Return cDataControl.getDataProvider ();
  }

  Thank you

  Mohsen

  Hi Isabelle,.

  I assumed that his Session EJB bean has not been exposed as a data control (my bad, didn't read any of the discussion).

  Antonis

• Error during the generation of session bean

  Hi all
  
  EPCO: 12.1.1.1.0
  
  I created the entities JPA through the Assistant of "JPA entities from Tables" for employees and departments.
  Now, I want to create the bean in session using the Wizard "Session Bean of JPA entities.
  I give it a name and select all of the available features and click on "Finish". Then I got the following error:

  Error running the session bean generation task.

  In the console error log, I see the following:

  org.eclipse.core.commands.ExecutionException: 
       at oracle.eclipse.tools.webtier.ui.wizards.existing.EJBProjectFromExistingDataModelOperation.execute(EJBProjectFromExistingDataModelOperation.java:67)
       at oracle.eclipse.tools.adf.view.ui.internal.wizard.datamodel.NewSessionBeanFromEntitiesWizard.addEJBFacetOperation(NewSessionBeanFromEntitiesWizard.java:249)
       at oracle.eclipse.tools.adf.view.ui.internal.wizard.datamodel.NewSessionBeanFromEntitiesWizard.createNewServiceDefnAndGenBeans(NewSessionBeanFromEntitiesWizard.java:219)
       at oracle.eclipse.tools.adf.view.ui.internal.wizard.datamodel.NewSessionBeanFromEntitiesWizard.doFinish(NewSessionBeanFromEntitiesWizard.java:169)
       at oracle.eclipse.tools.adf.view.ui.internal.wizard.datamodel.NewSessionBeanFromEntitiesWizard.access$0(NewSessionBeanFromEntitiesWizard.java:160)
       at oracle.eclipse.tools.adf.view.ui.internal.wizard.datamodel.NewSessionBeanFromEntitiesWizard$1.run(NewSessionBeanFromEntitiesWizard.java:133)
       at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
  Caused by: org.eclipse.core.runtime.CoreException: 
       at oracle.eclipse.tools.webtier.ui.wizards.existing.EJBProjectConverter.convert(EJBProjectConverter.java:281)
       at oracle.eclipse.tools.webtier.ui.wizards.existing.EJBProjectFromExistingDataModelOperation.execute(EJBProjectFromExistingDataModelOperation.java:61)
       ... 6 more
  Caused by: java.lang.NullPointerException
       at org.eclipse.jst.j2ee.project.facet.J2EEModuleFacetInstallDataModelProvider.hasValidRuntime(J2EEModuleFacetInstallDataModelProvider.java:213)
       at org.eclipse.jst.j2ee.project.facet.J2EEModuleFacetInstallDataModelProvider.propertySet(J2EEModuleFacetInstallDataModelProvider.java:162)
       at org.eclipse.jst.j2ee.internal.ejb.project.operations.EjbFacetInstallDataModelProvider.propertySet(EjbFacetInstallDataModelProvider.java:137)
       at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.internalSetProperty(DataModelImpl.java:182)
       at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.setProperty(DataModelImpl.java:172)
       at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.setStringProperty(DataModelImpl.java:201)
       at oracle.eclipse.tools.webtier.ui.wizards.existing.EJBProjectConverter.convert(EJBProjectConverter.java:126)
       at oracle.eclipse.tools.webtier.ui.wizards.existing.EJBProjectConverter.convert(EJBProjectConverter.java:273)
       ... 7 more

  Anyone has any idea what happened and how can I fix?
  
  Thank you in advance.
  
  Filip Huysmans.

  To work around this problem, follow these steps:
  -On the model JPA project
  RT - click on, and then select Properties
  -Select project facets
  -Unlock and deselect the facet utility Module
  -Select the facet of the EJB Module and Oracle WebLogic EJB Extensions

  Your project must be ready to perform the given operation.

• To access the Session Bean?

  Hello

  With the help of Jdev 11.1.1.7.0. mrequirement is I need to access session Bean on the Module of the Application.

  
  

  so I use this way in my implementation of the application module class .

  SessionBeanClassName sessionBeanClassObject is JsfUtils.getManagedBean ("recorded in the adfc-config sessionBeanName").

  I can able to access via the module of the application.

  My question is:

  1. is this good sense?

  2. No Impact on this approach?

  3. is this a good practice?

  4 is one way to access the variable from Session Bean on the application module.

  Thank you.

  Q2) the impact is that you break the mvc pattern and therefore the model of coupling to the display. Later, this can be a problem because your application doesn't fit. Add pass you ui state model (am) you might encounter problems when querying comes into play.

  Sample of Q4) Chris did not access to a bean in scope session leave an application module, but how to get there from an another view layer bean.

  Joel Ramamoorthy-Oracle and Cvele_new_account and myself you asked before, without a real use case all we can say is: don't access scope the model layer session bean.

  Timo

• Session Bean vs Entity Bean?

  We have a contractor who joined us recently. He is our specialist in the ADF. We don't know much about ADF. He said the layer of data model in the ADF, he must choose between the session beans and entity beans. I am especially ignorant of these things and their implications. I come to know objects entity and visualization of objects from access DB. Can someone give me an idea of what these are? Why not just create entity objects and some objects view and link as I always see in the tutorials? I would ask him, but I'm eager to check what it says of a 3rd party because it seems that it may be misleading us.

  He wants to use Java Beans EJB (Enterprise), while you tell the ADF business components

  Entity Beans

  What is an entity bean?

  https://blogs.Oracle.com/Shay/entry/adf_business_components_or_top

• Export of database Session Bean (J2EE 1.4)

  Hello people,
  
  I try to implement a download of large files for end users, the data are extracted from a database.
  
  Configuration and Description of the problem:
  ----------------------------------------
  
  A J2EE 1.4 stateless Session Bean record-wise reads data from a large database table, generates a string of each record and adds the string in a text output for the download stream. The steps involved are (in pseudocode):
  
  For each record in the database table:
  1.) apply business logic to record data (formatting of numeric values, etc.)
  2.) Accumulate record data in a single string.
  3 writing string.) to an OutputStream
  
  When finished: download a file over HTTP to the end user.
  
  The processed data are very large (resulting text file will be 200-1500 MB), I think go with water courses is a feasible solution. An attempt at the interface of Bean Session would be:
  
  public OutputStream exportDb() {...}
  
  My problem is: inside the exportDb method, I implémenterai the algorithm described above, but this means that the whole issue will take place in the memory object (in the OutputStream). The download will be executed by a ServletOutputStream. How can I export the database table one recording by the other without implementing the logic of all its activities in a Servlet? The only way I can think is a variant of the Session Bean method that takes the ID of the record that must be treated as a parameter and executes the method in a loop in some servlet code:
  
  ....
  Somewhere in the Servlet
  OS = getServletOutputStream;
  
  for (int i = 1; i < nrOfRecords; ++ I) {}
  OS. Write (exportDb (i));
  }
  
  Is there else any solution "clean"?

  Assuming that you are working with a local ejb, you pass the OutputStream in the method, for example "exportDb (OutputStream out)" and move the outputstream servlet directly to the ejb. If you use a remote ejb, things get more complicated (I wrote a library for broadcasting remotely over rmi, called rmiio, that you can use if you are working with a remote ejb).

• How to set the session bean of backing bean variable

  Hi all -
  
  I have a bean with a session variable and I want to set the value of this variable to a bean of support. Could someone please suggest how to achieve this.
  
  I use ADF 11 g.
  
  Greetings-
  Rohit

  Hello

  First of all, you need get the referral of bean in the bean to support session, and call the method that sets the value of the attribute. Getting session bean reference - you can use dependency injection, which is the best way, but you must register your bean in faces-config. XML (not adfc - config.xml, see http://biemond.blogspot.com/2010/04/ejb-injection-in-jsf-managed-bean.html).
  An alternative is to search the session bean's JNDI.
  Third option involves data controls: you create a session bean data control and then expose the method to fix your attribute value, in the calling page to jspx pageDef. To do this, you can't use method that begins with 'set', because you will not be able to exhibit in the pageDef (at least not with the Visual Editor). Then, you can call this method from the bean to support using this code:

          BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
          OperationBinding operationBinding = bindings.getOperationBinding("yourSessionBeanMethodExposedInPageDef");
          operationBinding.execute();
  

  I hope this helps.
  Pedja

• JDeveloper 11 g new Session Bean Wizard error

  Hi all
  
  I experienced an error when you try to create a Session Bean using the 11 g Wizard.
  
  I followed the example of building a Web Application EJB and JPA, and JavaServer Faces tutorial, but using my own schema
  
  My scheme is simple, 2 - userstbl, and bugstbl tables. bugstbl.bugraisedby is a foreign key to usertbl.userid to a bug causing identiry.
  
  After you create the beans entity for my paintings, I then add the following named query:
  
  @NamedQuery (name = "Bugstbl.findBySurname", query = "select bugstbl.*, userstbl.surname from bugstbl, userstbl where bugstbl.bugraisedby = userstbl.userid and userstbl.surname as: p_surname")
  
  When I use the Session Bean, step 3 of 6 new Wizard dialog (Session façade - select JPA entity methods) is empty and does not allow me to select the methods to expose.
  
  If you continue with the wizrd an error message is displayed.
  
  "Year error has occurred." Click details for more information that might be useful when diagnosing or reporting this issue '
  
  The details are:
  
  java.lang.NullPointerException
  at oracle.jdevimpl.ejb.facade.ejb30.Ejb30NamedQueryMethodBuilder.getMethodInfoImpl(Ejb30NamedQueryMethodBuilder.java:194)
  at oracle.jdevimpl.ejb.facade.AbstractMethodBuilder.getEjbMethodInfo(AbstractMethodBuilder.java:62)
  at oracle.jdevimpl.ejb.facade.AbstractMethodBuilder.getMethodSignature(AbstractMethodBuilder.java:55)
  at oracle.jdevimpl.ejb.facade.ejb30.Ejb30NamedQueryMethodBuilder.getMethodSignature(Ejb30NamedQueryMethodBuilder.java:123)
  to oracle.jdevimpl.ejb.facade.EntityTreeModel$ MethodNode. < init > (EntityTreeModel.java:165)
  to oracle.jdevimpl.ejb.facade.EntityTreeModel$ EntityNode. < init > (EntityTreeModel.java:138)
  to oracle.jdevimpl.ejb.facade.EntityTreeModel. < init > (EntityTreeModel.java:193)
  at oracle.jdevimpl.ejb.facade.SessionFacadeBuilder.newEntityTreeModel(SessionFacadeBuilder.java:92)
  at oracle.jdevimpl.ejb.facade.SessionFacadeBuilder.getEntityTreeModel(SessionFacadeBuilder.java:85)
  at oracle.jdevimpl.ejb.facade.SessionFacadeBuilder.generateFacade(SessionFacadeBuilder.java:133)
  at oracle.jdevimpl.ejb.facade.ejb30.Ejb30SessionFacadeBuilder.generateFacade(Ejb30SessionFacadeBuilder.java:267)
  at oracle.jdeveloper.ejb.EjbGenerator.generateClasses(EjbGenerator.java:835)
  at oracle.jdeveloper.ejb.EjbGenerator.saveToParent(EjbGenerator.java:597)
  at oracle.jdeveloper.ejb.EjbGenerator.saveToParent(EjbGenerator.java:554)
  at oracle.jdevimpl.ejb.ejbwiz.EjbWizard.doFinish(EjbWizard.java:226)
  at oracle.jdevimpl.ejb.ejbwiz.EjbWizard.invokeImpl(EjbWizard.java:143)
  at oracle.jdevimpl.ejb.ejbwiz.SessionEjbWizard.invoke(SessionEjbWizard.java:108)
  at oracle.ide.wizard.WizardManager.invokeWizard(WizardManager.java:317)
  to oracle.ide.wizard.WizardManager$ 1.run(WizardManager.java:365)
  to oracle.ide.util.IdeUtil$ 3.run(IdeUtil.java:1079)
  at oracle.javatools.util.SwingUtils.invokeAfterRepaint(SwingUtils.java:520)
  at oracle.ide.util.IdeUtil.invokeAfterRepaint(IdeUtil.java:1092)
  to oracle.ide.wizard.WizardManager$ 2.run(WizardManager.java:373)
  to oracle.ide.util.IdeUtil$ 3.run(IdeUtil.java:1079)
  at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
  
  I can create the Session Bean without the part parameter of the named query and then manually add to the Session Bean. However, if I can drag this Session Bean in an EJB diagram I get the "serious unexpected error has occurred in JDeveloper" mentioned in other threads.
  
  Any ideas?
  
  P

  I think the problem is with your EJBQL syntax.
  A query like this will work:
  , @NamedQuery (name = "Employees.findbyName", query = "select o o employees where o.firstName =: p_name")

  Things to note and apply to your query:
  Use of o to represent the object
  First name - letters/lowecase according to the name of the attribute in the APP (not in table)

  Try and see if those who help.

  Or maybe try and move to NamedNativeQuery

• Session bean behaves as ask the Bean

  Hello, I met this stange behavior in my Application (JDeveloper 10.1.3.3).
  I have a jsp page that contains an element of SelectOneChoice:
  
  + < af:selectOneChoice inlineStyle = "margin: 10.0pt +;
  autoSubmit = "true" simple = "false".
  unselectedLabel = "sΘlectionner".
  + Binding = "#{backing_page.versionsSelectOne}" +.
  + id = 'Refresh' label = 'Versions' / > +.
  
  As you can see, this article is bound to a field in the bean of support for this page (which we will call the)
  Bean "PageBean"). The binding object is:
  
  + private CoreSelectOneChoice versionsSelectOne; +
  
  "PageBean" is a session, stated in faces - config.xml bean:
  
  + < managed-bean > +.
  + < managed-bean-name > backing_page < / managed-bean-name > +.
  + < managed-bean-class > mypackage. PageBean < / managed-bean-class > +.
  + session < managed-bean-scope > < / managed-bean-scope > +.
  + < / managed-bean > +.
  
  In the constructor of 'PageBean', I create a new Istance of the component:
  
  + Application apps = FacesContext.getCurrentInstance () .getApplication (); +
  + versionsSelectOne = (CoreSelectOneChoice) apps.createComponent (CoreSelectOneChoice.COMPONENT_TYPE); +
  
  The bean of support (in a method called by a button), I dynamically fill the CoreSelectOneChoice with the
  components (CoreSelectItem) I want to display in the drop-down list.
  
  Everything works fine BUT the "PageBean' is now recreated to * each request * (despite that it is a * Session * Bean).
  If I remove the CoreSelectOneChoice creation in the costructor, it still behaves like a Sesison Bean.
  This behavior is very strange, and it seems to be somehow connected to the CoreSelectOneChoice component.
  even if I see no Exception in my application.
  Does anyone have an idea on what is happening?

  Hi Antonio,.

  >
  (1) usually when I create a page, I can creata a support for the page bean. Can I keep the information contained in
  the bean for 4 different extended (zero, request, session, application), let'say that I am interested in session and demand.
  I thought that the components of support where like that, and JDev encourage to put then in a backing bean
  using "automatically expose UI components in a new Managed Bean. So my idea of a support of the bean internally who can manage the
  components of the user interface on the session's not going, and I have to do a new design for this application...
  Well, JDeveloper is incredibly bad on this part, so why this option is not hidden and disabled by default in 11g, unlike the step of creating the standard and active in 10 g. Normally, you very rarely use the JSF binding attribute unless the refresh PPR component, allows you to wire the values in place like EL:

  
  
  
  
  // The classes
  public class MyDataBean
  {
      private String name;
  
      public String getName()
      {
          return name;
      }
  
      public void setName(String name)
      {
          this.name = name;
      }
  }
  
  public class MyControllerBean
  {
      private MyDataBean data;
  
      public String save()
      {
          // Call the model layer to save the data in MyDataBean
          return "success";
      }
  
      public MyDataBean getData()
      {
          return data;
      }
  
      public void setData(MyDataBean data)
      {
          this.data = data;
      }
  }
  
  
  
    data
    MyDataBean
    session
  
  
    controller
    MyControllerBean
    request
    
      
      MyDataBean
      #{data}
    
  
  

  (2) I'm not here. If the component (for example CoreSelectOneChoice) class is not a managed bean of JSF,.
  How can we instantiate frame it? In any case, I had a nullpointexception if I try to set a property of the
  component (CoreSelectOneChoice) in the bean to support, without the first instantiation of it.
  You must set the properties in the binding Set accessor method:

  public class BackingBean
  {
      private CoreSelectOneChoice choice;
  
      public CoreSelectOneChoice getChoice()
      {
          return null; // safer than returning choice in case 2 pages binds on the same bean
      }
  
     public void setChoice(CoreSelectOneChoice choice)
     {
         this.choice = choice;
         this.choice.setLabel("Foo"); // Here, in the setter, NOT in the constructor so JSF instantiate the component, not you.
     }
  }
  

  (3) ok I can do it by hand, but it reminds me of something that it is done automatically by spring.
  Thanks for your reply.
  JSF 2.0 and JSR-299 allow injection using the annotation, but Spring does not automatically, you must configure the spring to do, same goes for the JSF.

  Kind regards

  ~ Simon

• [ADF, JDev12.1.3] viewScope bean can not recover sessionScope bean. Why? (How to day uploading of a session bean scope whenever a page with params is called)

  Hallo,

  to the login page of my application, I created a viewScope managed bean loginView.

  In the login page, I put a "dummy" inputText (whose value is related to dummyInitEditValue bean attr) to perform lazy loading of the page itself.

  In the initData() function I call a function of a bean sessionScope connection which should initlialize some of its attributes.

  public class LoginView {
    private Integer dummyInitEditValue;
  
    public LoginView() {
    }
  
    private void initData() {
      Login loginBean = (Login) FacesUtils.getManagedBeanInSession("login"); // loginBean = null !!!
      loginBean.initData();
      dummyInitEditValue = 1;
    }
  
    public void setDummyInitEditValue(Integer dummyInitEditValue) {
      this.dummyInitEditValue = dummyInitEditValue;
    }
  
    public Integer getDummyInitEditValue() {
      // Per lazy loading
      if (dummyInitEditValue == null)
        initData();
      return dummyInitEditValue;
    }
  }
  
  
  

  The problem is that the initData() rises a null pointer exception because the bean connection is not found.

  What's not in my approach?

  I create this hoping to resolve this issue: the login page has 2 URL parameters (defined in his point of view in the config.xml file - adfc) and I have according to them I need to update some of the bean sessionScope uploading connection every time the page is called / refreshes (possibly with new values for the parameters).

  BdW I do not know if there is a better alternative you can advice me.

  Thank you

  Federico

  Well, you need to instantiate bean connection somehow.

  You can try to link an attribute of connection bean to the page and see if this will help or you can try to resolve expression programmatically (something like #{connection}).

  Or you can try adding session bean defined as managed property for your bean view extended (something like this: http://umeshagarwal24.blogspot.ba/2012/09/using-managed-property-to-evaluate.html).

  Dario

• [ADF, JDev12.1.3] Scope of session bean: it can contain attributes related to the Value property of user interface components?

  Hallo,

  I have a defined session bean in which I put a string attribute that is bound to the Value property of an InputText in my testPage.

  public class SessionClass {
  
    private String text;
  
    public void setText(String text) {
      this.text = text;
    }
  
    public String getText() {
      return text;
    }
  }
  

  

  When I run the testPage, it is not displayed.

  Perhaps this kind of linking is not possible?

  Thank you

  Federico

  Never use prefix in scope to the standard servlet scopes (request, session, application)

  So it would be: #{sessionClass.text}

  Dario

• Does container managed entity manager is thread-safe in stateless session bean?

  Hello

  I have read JEE6 doc and confused with

  Manager managed entity containing does (injected by PersistenceContext annotation) is thread-safe in bean of stateless session in env mutiple-thread?

  See code below, if there are 2 requests to stateless session bean in 2 concurrent threads, is it using the same Instance of the managing body or not?

  @Stateless (name = "HRFacade", mappedName = "HR_FACES_EJB_JPA-HRFacade-HRFacade")

  / public class HRFacadeBean implements HRFacade, HRFacadeLocal {}

  @Resource

  SessionContext sessionContext;

  @PersistenceContext (unitName = "HRFacade")

  Private EntityManager em;

  public places (places sites) persistLocations {}
  EM. Persist (rentals);
  return places;
  }

  public places (places sites) mergeLocations {}
  Return em.merge (rentals);
  }

  {} public void removeLocations (places sites)
  location = em.find (Locations.class, locations.getLocationId ());
  EM. Remove (rentals);
  }

  / * < code > o selection of the places where < code > * /.
  @TransactionAttribute (TransactionAttributeType.NOT_SUPPORTED)
  public list < location > getLocationsFindAll() {}
  Return em.createNamedQuery ("Locations.findAll", Locations.class) .getResultList ();
  }

  }

  Yes its safe. Stateless beans would be useless if it wasn't the case. That's the bit of "controlled container" description, as long as you leave the container do its job, you don't have to worry about such details.

• NullPointerException when trying to data Get Session Bean in scope in an another ManagedBean

  Hello

  I used to access some data in my session bean brought a request bean so when I try to get all this data, I get

  com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection
   on managed bean «discussionlaoder» 

  


  at the end of the exception, there are

  Caused by: java.lang.NullPointerException at Hiber.discussionlaoder.init(discussionlaoder.java:35)

  
  

  


  This is my code:

  1 - the scope application bean

  @ManagedBean
  @RequestScoped
  public class discussionlaoder {}

  private MyadmninHelper halper;

  @ManagedProperty(value="#{serviceBean}")
  Private ServicesBean serviceBean;
  @PostConstruct
  public void init() {}
  Halper = getServiceBean () .getHalper ();  line 35

  }

  code Seter and Giraudeau

  }

  2 - the scope sessions bean

  @ManagedBean (impatient = true)
  @SessionScoped
  public class ServicesBean {}

  
  
  private MyadmninHelper halper;

  code Seter and Giraudeau

  }

  uses the glassfish 3.1 Server

  Thanks for the help

  Oky this is work I just put the attribute like this name

  @ManagedBean (impatient = true, name = "serviceBean")
  @SessionScoped
  public class ServicesBean {}

  private MyadmninHelper halper;

  code Seter and Giraudeau

  }

• Cluster server: Replication Session bean

  I use JDeveloper 11.1.1.6.0
  
  I am currently developing our application for a clustered environment, and I was following section 20.4.3 the following document: http://docs.oracle.com/cd/E23943_01/web.1111/b31974/web_getstarted.htm#CHDIJCIE
  
  The document mentions that I need to make the beans of sight, pageflow and session as "serializable" and this bean pageflow view range shall be marked as dirty when they are updated. However, session bean did not have to be marked. I have to do something else in order to ensure that changes to the scope of the session is replicated in the cluster? ADF or somehow detect that there is a change and manage this replication for me?
  
  Thank you.

  The reason why you only need to do this for the beans to view range and pageflow is the way in which they are stored. These scopes are stored as cards in the scope of the session. If you change a bean inside the scope of session card don't know it because she knows that the reference and value.
  Changes to the session scope objects are tracked by the framework.

  Timo