Select Max - erro

Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to [Ljava.lang.Object;

at br.uniplan.servico.planouni.CadguiaServico.salvarobjeto(CadguiaServico.java:48)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)

at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)

at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)

at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)

at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)

List<Object> objectList = dao.seq_cadguia();

                Iterator iterator = objectList.iterator();
                
                Integer sequencia_guia = 0;
                
                while(iterator.hasNext()){
                    Object []obj = (Object[])iterator.next();
                    sequencia_guia =(Integer) obj[0];
                    
                }   


********************************************
    @Interceptors({GerenciaTransacaoInterceptor.class})  
    public List<Object> seq_cadguia() {    
        try {      
            
            String query = "select max(c.codguia + 1) as codguia from Cadguia c ";                            
            return (List<Object>) emAux.createQuery(query).getResultList();            
        }
        catch (Throwable ex) {             
                System.err.println("failed.----" + ex);  
                throw new ExceptionInInitializerError(ex);  
        }  
    }