The Spring Framework

## org.springframework.ejb.support
Class AbstractStatelessSessionBean

    java.lang.Object
      org.springframework.ejb.support.AbstractEnterpriseBean
          org.springframework.ejb.support.AbstractSessionBean
              org.springframework.ejb.support.AbstractStatelessSessionBean

All Implemented Interfaces:
  Serializable, EnterpriseBean, SessionBean, SmartSessionBean

    public abstract class AbstractStatelessSessionBean

extends AbstractSessionBean

Convenient base class for EJB 2.x stateless session beans (SLSBs), minimizing the work involved in implementing an SLSB and preventing common errors. Note that SLSBs are the most useful kind of EJB.

As the ejbActivate() and ejbPassivate() methods cannot be invoked on SLSBs, these methods are implemented to throw an exception and should not be overriden by subclasses. (Unfortunately the EJB specification forbids enforcing this by making EJB lifecycle methods final.)

There should be no need to override the `setSessionContext()` or `ejbCreate()` lifecycle methods.

Subclasses are left to implement the `onEjbCreate()` method to do whatever initialization they wish to do after their BeanFactory has already been loaded, and is available from the `getBeanFactory()` method.

This class provides the no-arg `ejbCreate()` method required by the EJB specification, but not the SessionBean interface, eliminating a common cause of EJB deployment failure.

Author:
  Rod Johnson
See Also:
  Serialized Form

Field Summary
`protected Log` `logger` Logger available to subclasses

Fields inherited from class org.springframework.ejb.support.AbstractEnterpriseBean
`BEAN_FACTORY_PATH_ENVIRONMENT_KEY`

Constructor Summary
`AbstractStatelessSessionBean()`

Method Summary
`void` `ejbActivate()`
`void` `ejbCreate()` This implementation loads the BeanFactory.
`void` `ejbPassivate()`
`protected abstract void` `onEjbCreate()` Subclasses must implement this method to do any initialization they would otherwise have done in an `ejbCreate()` method.

Methods inherited from class org.springframework.ejb.support.AbstractSessionBean
`getSessionContext, setSessionContext`

Methods inherited from class org.springframework.ejb.support.AbstractEnterpriseBean
`ejbRemove, getBeanFactory, onEjbRemove, setBeanFactoryLocator, setBeanFactoryLocatorKey`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface javax.ejb.SessionBean
`ejbRemove`

Field Detail

### logger

    protected final Log logger

  Logger available to subclasses

Constructor Detail

### AbstractStatelessSessionBean

    public AbstractStatelessSessionBean()

Method Detail

### ejbCreate

    public void ejbCreate()
                   throws CreateException

  This implementation loads the BeanFactory. A BeansException thrown by loadBeanFactory will simply get propagated, as it is a runtime exception.

  Don't override it (although it can't be made final): code your own initialization in onEjbCreate(), which is called when the BeanFactory is available.

  Unfortunately we can't load the BeanFactory in setSessionContext(), as resource manager access isn't permitted there - but the BeanFactory may require it.

  Throws:
    `CreateException`

### onEjbCreate

    protected abstract void onEjbCreate()
                                 throws CreateException

  Subclasses must implement this method to do any initialization they would otherwise have done in an `ejbCreate()` method. In contrast to `ejbCreate`, the BeanFactory will have been loaded here.

  The same restrictions apply to the work of this method as to an `ejbCreate()` method.

  Throws:
    `CreateException`

### ejbActivate

    public void ejbActivate()
                     throws EJBException

  Throws:
    `EJBException`
  See Also:
    `This method always throws an exception, as it should not be invoked by the EJB container.`

### ejbPassivate

    public void ejbPassivate()
                      throws EJBException

  Throws:
    `EJBException`
  See Also:
    `This method always throws an exception, as it should not be invoked by the EJB container.`

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