Cluster server: Replication Session bean

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• 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

  }

• Session bean - second client

  What's the use main session client - bean session?
  
  Please explain.

  A session bean is an object stored in the context of a session, which means he lives in the paper that the life of the session and each session has its own instance of the bean.
  A client of the session (not sure if I heard this) is an application on the client (for example a browser) related to a server session in an application web (I guess).

  Timo

• 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.

• [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

• 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

• 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.

• 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

• Add a virtual cluster node to an existing cluster server environment

  I'm working on a project to add a virtual server in our ESX - 3.5 environment to a group of existing Microsoft cluster server... Is there a way to create a virtual HBA to generate a name WWN Conect to a Lun on our san see the data already stored there but not destroy data when connecting to the lun.

  . (San is connected to our IBM Blade Center now fiber)

  Hello

  Take a look at this link on the MSCS on VMware cluster:

  http://www.VMware.com/PDF/vSphere4/R41/vsp_41_mscs.PDF

  Best wishes / Saludos

  -

• Stateful session bean store module in EJB?

  Hello
  
  I want to use my EJB Stateful Session Bean (SFSB) module. But it seems that I can't use it because I should not inject my SFSB to a managed bean, or message driven bean (because if I do, the SFSB is communicated to all customers)
  
  I found that the proposed solution is to store SFSB in HttpSession.
  
  I'm doing this way, but I have null pointer exception.
  

  HttpSession session = (HttpSession) facesContext.getExternalContext().getSession(true); 

  So, how can I do this in the EJB module?
  
  Thank you

  Well me: hardly. Generally there is a web layer involved with a perfectly good session (or conversation) in what state can be maintained.

  Alas, you don't want to not seem to really say what is on your mind with or without my eyes so I'll offer just a hunch I have. A stateless bean remains "active" that as long as you keep a connection active IE. the reference that you are looking for or inject into your client code. The 'storage in the session bean' you refer to your first post is the Act of perpetuating the bean; as long as the reference is stored in the session you can continue to use it for the same customer without being cleaned by the container. However: when you are working from a web layer there is not a lot of use for a stateful bean because you can simply use the session itself directly to keep the substance. His personal preference if you use them or not really.

  Where you were going wrong in your initial post, is that you get the the HTTP session object in your EJB code. But you probably already figured out for yourself.

• 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.

• Failed to retrieve the scope session bean

  Hello
  I'm working on JDeveloper 11.1.1.6.0.
  
  I use a session bean extended for the storage of information about the logged-on user. I have a page and a reading of the data of this extended session bean managed bean. It works very well. But now, I created another page also using the bean managed to read the data of the extended session bean. But he always returned null for the bean.
  
  Anyone has an idea why this might happen? It is not really clear to me why she is working with the first page and not with the second page, even when they both use the 'same' bean managed.
  
  Thanks in advance.
  Alex

  Alex,

  Kind of how convoluted to get a reference to a bean.

  Have you tried to create a managed property in the bean where is your code (set the value of the property #{SessionBean} in faces-config.) (XML)?

  John

• [Session beans] Can't make matters!

  Hello
  I created a simple session bean and find the method works very well. Problem comes with queries... I tried to make this simple query:

  Query query = em.createQuery("from Employee e where e.name='myName' ")

  but I have this exception:
  >
  GRAVE: [!] EXCEPTION!] An exception occurred while creating a query in EntityManager:
  Description of the exception: syntax error parsing of the request [from employee e where e.name = 'myName'], line 1, column 0: unexpected [in] token.
  Inner exception: NoViableAltException(33@[])
  >
  
  and this applies to all the queries that I do... I tried different others, but the result is always the same...

  HQL, you can drop the 'select' clause, but I don't think you can do this in the JPA query language. have you tried something like "select employee e where e.name = 'myName'?"

  More examples here http://docs.oracle.com/javaee/5/tutorial/doc/bnbtg.html.

  Published by: jtahlborn on April 13, 2012 13:01