java.lang.NullPointerException at org.jboss.ejb.plugins.loca

[ncutjlh]

Hi all,
my environment is :
os:windowxp
jboss:jboss4.0.2
tomcat:jboss-4.0.2\server\default\deploy\jbossweb-tomcat55.sar

i depoyed web application on jboss-4.0.2\server\default\deploy\test.war
when i access the ejb use localhome have the follow exception:
09:41:22,577 INFO [STDOUT] at org.jboss.ejb.plugins.local.LocalHomeProxy.invoke(LocalHomeProxy.java:118)
09:41:22,577 INFO [STDOUT] at $Proxy79.create(Unknown Source)
09:41:22,577 INFO [STDOUT] at com.d3.common.ejbproxy.impl.ServiceProxyEJBLocalImpl.getService(ServiceProxyEJBLocalImpl.java:107)
09:41:22,577 INFO [STDOUT] at com.d3.common.ejbproxy.impl.ServiceProxyEJBLocalImpl.doService(ServiceProxyEJBLocalImpl.java:51)

follow is my source code:

public EventResponse doService(D3biValueObject valueObject,String serviceNameID, String methodName)
{
logger.info("doService begin. ");
BaseEvent baseEvent = new BaseEvent();

baseEvent.setBeanKeyRef(serviceNameID);
baseEvent.setMethodName(methodName);
baseEvent.setValueObject(valueObject);

EventResponse responseEvent = null;
D3biServiceLocal d3biServiceLocal = getService("d3bi/ejb/D3biServiceBeanLocal") ;
responseEvent = d3biServiceLocal.doBusiness(baseEvent);

//responseEvent = Util.doService(baseEvent, Constants.beanFactory);
logger.info("doService end. ");
return responseEvent;
}

public EJBLocalHome getLocalHome(String s)
{
logger.info("getLocalHome begin. ");
logger.info("getLocalHome jndi is " + s);
EJBLocalHome ejblocalhome = null;
try
{
Hashtable properties = new Hashtable();
properties.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
properties.put(Context.PROVIDER_URL, "jnp://localhost:1099");
properties.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");

ejblocalhome = (EJBLocalHome) new InitialContext(properties).lookup(s);

} catch (NamingException namingexception)
{
namingexception.printStackTrace() ;
throw new ServiceException(namingexception.getMessage());
} catch (Exception exception)
{
exception.printStackTrace() ;
throw new ServiceException(exception.getMessage());
}
logger.info("getLocalHome end. ");
return ejblocalhome;
}

public D3biServiceLocal getService(String s)
{
logger.info("getService begin. ");
D3biServiceLocal obj = null;
try
{
D3biServiceLocalHome ejblocalhome = (D3biServiceLocalHome)getLocalHome(s);
logger.info("Service Local Home JNDI: " + s);
logger.info("Service Local Home: " + ejblocalhome.getClass().getName());
logger.info("Service Local Home create before ");

//Method method = ejblocalhome.getClass().getDeclaredMethod("create", null);
// obj = (D3biServiceLocal)method.invoke(ejblocalhome, null);

if(ejblocalhome == null)
{
logger.info("###############ejblocalhome is null ");
}else
{
logger.info("###############ejblocalhome is not not not null ");
}
obj = ejblocalhome.create() ;
logger.info("Service Local Home create end ");
if(obj == null)
{
logger.info("###############Service Local is null ");
}
}
catch(Exception ex)
{
logger.info("###############error : " + ex.getMessage());
ex.printStackTrace() ;
throw new ServiceException("Exception", ex);
}
logger.info("getService end. ");
return obj;
}

expected reply,tanks!