ejb-3.0

问题 The title isn't clear as I couldn't think of one but, I have an EJB project and am trying to play with JPA. To create the entity manager I am injecting it in via annotations @PersistenceContext(unitName="testConnection") private EntityManager em; When I run a test query which I believe to be fine Query userQuery = em.createQuery("SELECT u FROM TestUser u WHERE u.username = 'test' u.password = 'test'"); tu = (TestUser) userQuery.getSingleResult(); I get an exception which points toward the EJB

问题 The context is the following : An client application uses a stateless session bean in order to login on an EJB server application. If the login is successful, the client should get a stateful session bean in order to perform some transactions on his personal data. However, I would want that the login method returns a new instance of this stateful session bean such that a client should not be able to manually call this session bean and perform transactions without being authenticated. Is it

问题 I have the following situation: Request-scoped JAX-RS service invokes stateless EJB3 bean and the EJB3 bean retains state between successive invocation of the web service from a client. Code as follows: web service @javax.enterprise.context.RequestScoped @Path("/actions") public class CounterFrontEnd { @EJB private ICounterService.ILocal counterService; @GET @Produces("application/text;") @Path("/counter") public String counter() { return String.format("%d ", counterService.incCounter()); }

问题 I want to use an interceptor for my bean, which will check the validity of a given connection token. If the connection is invalid, I want to throw a particular exception, if the connection expired, I want to send another (TokenExpiredException, something like this). These Exceptions are included in the interface given to the client. @AroundInvoke public Object checkParams(InvocationContext ctx) throws TokenExpiredException, Exception{ //code to check token //... throw new

问题 I have an enterprise application which is delivered as an EAR file. The META-INF folder within the ear contains 'application.xml' as expected, with a list of modules belonging to the application. There are a number of EJB jar files within the ear also, each of which contain a number of EJBs. For certain reasons, we wish to use XML deployment descriptors to configure all of the ejbs. As a result we have a number of ejb-jar files, each one embedded in the META-INF folder of each jar within the

问题 I'm a newbie in Java EE. This is the first project I'm trying to do and I have a problem that I just can't solve. I've created three projects: slowka-beans (EJB), slowka-persistance (JPA) and slowka-web(JSF). After deploying them I can't get access to persistence unit - the EntityManager is null. Everything works fine - I can create beans, inside them instantiate entity classes and show them on JSF page. But how can I store them in the DB? I have MySQL database configured on JBoss site. The

问题 I am not an ejb expert. I have a service class like below. I am saving a file in some location in my service class and calling a method in dao to save the file hash code. Due to some reasons some time I get an exception in my dao layer. Recently I observed the file which is saved from my service layer is not deleted when I get excxeptions. @Stateless @Local @TransactionManagement public class ImportUpgradeServiceImpl implements ImportUpgradeService { @Inject private UpgradePackageDao

问题 I need to rollback in EJB 3 Stateless SessionBean (CMT, JBoss version 5), for which I am using sessionContext.setRollbackOnly(); This sessionContext is injected using @Resource annotation. My questions: 1) Is it preferred way to rollback in EJB3? 2) Why Jboss complains on deployment if I use public setter injection // throws exception on deployment. private SessionContext sessionContext; @Resource public void setSessionContext(SessionContext sessionContext) { this.sessionContext =

问题 I am currently developing Java/GWT-application which is hosted on a weblogic application server. I am using EJB3.0 with EclipseLink as persistence layer. Sadly my GWT has problems to deserialize persistent entities. It might be helpful for you to know, that I have the EclipseLink-Library in my classpath (including javax.persistence.Entity ) am not recieving the persistence objects from a database or persistence-manager - I am creating the objects with standard java code use Eclipse IDE for

问题 I've put the Hibernate libraries in both the Glassfish domain and in the library collection of my project in Netbeans. hibernate-entitymanager.jar contains both HibernatePersistence (the last class in the call stack) and Ejb3Configuration, so I'm rather stumped as to why I get the missing class error for Ejb3Configuration. java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.ejb.Ejb3Configuration at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory