public EJBInvokerJob() 
{
    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constructors.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */
        // nothing
}

 public  void execute(JobExecutionContext context) throws JobExecutionException 
{
        JobDetail detail = context.getJobDetail();
        JobDataMap dataMap = context.getMergedJobDataMap();
        String ejb = dataMap.getString(EJB_JNDI_NAME_KEY);
        String method = dataMap.getString(EJB_METHOD_KEY);
        Object[] arguments = (Object[]) dataMap.get(EJB_ARGS_KEY);
        if (arguments == null) {
            arguments = new Object[0];
        }
        if (ejb == null) { 
            // must specify remote home
            throw new JobExecutionException(); 
        }
        InitialContext jndiContext = null;
        // get initial context
        try {
            jndiContext = getInitialContext(dataMap);
        } catch (NamingException ne) {
            throw new JobExecutionException(ne);
        }
        try {
            Object value = null;
            // locate home interface
            try {
                value = jndiContext.lookup(ejb);
            } catch (NamingException ne) {
                throw new JobExecutionException(ne);
            } 
            // get home interface
            EJBHome ejbHome = (EJBHome) PortableRemoteObject.narrow(value,
                    EJBHome.class);
            // get meta data
            EJBMetaData metaData = null;
            try {
                metaData = ejbHome.getEJBMetaData();
            } catch (RemoteException re) {
                throw new JobExecutionException(re);
            }
            // get home interface class
            Class homeClass = metaData.getHomeInterfaceClass();
            // get remote interface class
            Class remoteClass = metaData.getRemoteInterfaceClass();
            // get home interface
            ejbHome = (EJBHome) PortableRemoteObject.narrow(ejbHome, homeClass);
            Method methodCreate = null;
            try {
                // create method 'create()' on home interface
                methodCreate = homeClass.getMethod("create", ((Class[])null));
            } catch (NoSuchMethodException nsme) {
                throw new JobExecutionException(nsme);
            }
            // create remote object
            EJBObject remoteObj = null;
            try {
                // invoke 'create()' method on home interface
                remoteObj = (EJBObject) methodCreate.invoke(ejbHome, ((Object[])null));
            } catch (IllegalAccessException iae) {
                throw new JobExecutionException(iae);
            } catch (InvocationTargetException ite) {
                throw new JobExecutionException(ite);
            }
            // execute user-specified method on remote object
            Method methodExecute = null;
            try {
                // create method signature
                Class[] argTypes = (Class[]) dataMap.get(EJB_ARG_TYPES_KEY);
                if (argTypes == null) {
                    argTypes = new Class[arguments.length];
                    for (int i = 0; i <  arguments.length; i++) {
                        argTypes[i] = arguments[i].getClass();
                    }
                }
                // get method on remote object
                methodExecute = remoteClass.getMethod(method, argTypes);
            } catch (NoSuchMethodException nsme) {
                throw new JobExecutionException(nsme);
            }
            try {
                // invoke user-specified method on remote object
                Object returnObj = methodExecute.invoke(remoteObj, arguments);
                // Return any result in the JobExecutionContext so it will be 
                // available to Job/TriggerListeners
                context.setResult(returnObj);
            } catch (IllegalAccessException iae) {
                throw new JobExecutionException(iae);
            } catch (InvocationTargetException ite) {
                throw new JobExecutionException(ite);
            }
        } finally {
            // Don't close jndiContext until after method execution because
            // WebLogic requires context to be open to keep the user credentials
            // available.  See JIRA Issue: QUARTZ-401
            if (jndiContext != null) {
                try {
                    jndiContext.close();
                } catch (NamingException e) {
                    // Ignore any errors closing the initial context
                }
            }
        }
}