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Problem with NativeQuery

 
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Hi, I have a problem with the function NativeQuery of the entityManager, here is my code:

public List executeNativeQuery(String aQuery, Class itemClass,int max) {

Query query = entityManager.createNativeQuery(aQuery, itemClass);
if (max > 0)
query.setMaxResults(max);
return query.getResultList();
}

But when I call this function I got this exception:

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) .....
Caused by: java.lang.NullPointerException
at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:379)
at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
 
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