stateless-session-bean

问题 I know Stateless EJBs are stored in a pool and instantiated as needed, my question is, what happens when there are more EJB dependencies, for example with something like this: @Remote @Stateless public class Master_EJB{ @EJB private EJB_A ejb_A; @EJB private EJB_B ejb_B; } With EJB_A and EJB_B also being stateless EJBs. In the worst case, if there are two petitions at exactly the same time, the server will retrieve two instances of Master_EJB from the pool (or create if needed). But if from

问题 Normally we use singleton instance for business / dao layer. What is the reason behind pooling stateless session beans in case of EJBs? 回答1: The "stateless" in the name refers to session conversation state, i.e. state that persists between invocations of the bean, retained for the duration of the session. However, stateless session beans are still permitted to have instance variables. Those instance variables should not relate to the conversation state, but are "shared" between clients. In

问题 i created a custom ConstraintValidator Annotation which called APIAuth , and i tried to fetch the remote user IP Address Using @Context HttpServletRequest , but the problem is when calling the APIAuth inside my Stateless , the APIAuth custom validator work , and it fetch the remote user ip address , but when i try to refresh the request again quickly , it throw an exception , because of @Context HttpServletRequest be null at this case , it need from me to wait some seconds before trying to

问题 I'm trying to use plain old java objects(POJO)'s and regular class files where needed and only use EJBs when I need the functionality that they add such as asynchronous calls, pooling, etc. I'm wondering how the server treats this behavior once the project is deployed on a server. Since it is not managed by the container does a new instance have to be created for every stateless session bean pooled that might call one of it's methods? How do things like static methods or state affect this

问题 i want to use ejb and jpa controller, in netbeans the controller is generated automatically... I try to call the jpa controller from class (UniversidadServiceEJB) that is a session bean stateless, I debugged the project and the UserTransaction and EntityManagerFactory is created successfully but when call the method utx.begin in the jpa controller (UniversityJpaController) throws this exception: java.lang.IllegalStateException: Operation not allowed. at com.sun.enterprise.transaction

问题 I have 2 EJB app, A and B. A has a stateless session that send a message to app B (Message driven bean). App B send a message back to app A. Now, I have the value I want in the message listener in the stateless session bean in A. But I need to show it from Main. I tried declaring a variable and store the value in it. But when I call it from Main, the value is lost. @Stateful public class AManagerBean implements ejb.AManagerRemote { @Resource(mappedName = "jms/QueueConnectionFactory") private

问题 I can see how one can control the size of the global pool for all the stateless session beans. However, I would like to be able to have a new pool that only applies to one type of stateless bean. This way, all my stateless beans but one would be pooled from the usual slsb-strict-max-pool , and one bean would have its own pool. Is it possible to do that in JBoss EAP 6.1? 回答1: Use @org.jboss.ejb3.annotation.Pool(value="myPoolName") annotation on the EJB referencing your custom pool as defined

问题 i am working on an application(enterprize application in java) in which i need is single instance to be shared by multiple thread concurrently for which i have used @singleton . when each user login a value is set in telecallers List by invoking setTeleCallersDetails() remote method. but at certain point when number of user logged in exceed 15 then @singleton starts behaving like @stateless bean as setTeleCallersDetails() start adding value in new tellcaller arraylist. can anybody tell to

问题 I have @Stateless bean which implements two interfaces (remote and local). I have also added @LocalBean anotation for accessing bean with a no-interface view. @Stateless @LocalBean public class WeatherDataBean implements WeatherDataBeanRemote, WeatherDataBeanLocal { @Inject private EntityManager entityManager; public WeatherDataBean () { } // ....attributes, getter & setter methods .... } I use @Inject for this reason taken from this example of JBoss AS7 quickstart: We use the "resource

问题 I have @Stateless bean which implements two interfaces (remote and local). I have also added @LocalBean anotation for accessing bean with a no-interface view. @Stateless @LocalBean public class WeatherDataBean implements WeatherDataBeanRemote, WeatherDataBeanLocal { @Inject private EntityManager entityManager; public WeatherDataBean () { } // ....attributes, getter & setter methods .... } I use @Inject for this reason taken from this example of JBoss AS7 quickstart: We use the "resource