CREATE TABLE MYTABLE (
   NAME CHAR (3) NOT NULL     
 , PRIMARY KEY (CLIENT)                                                      
) IN MYDATABASE.MYTABLESPACE;                                                          

NAME
----
AT1
BE1
CH1
DEB

@Entity
@Table(name="MYTABLE")
@NamedQueries({
   @NamedQuery(
      name="MyEntity.getAll",
      query="select e from MyEntity e"),
})
public class MyEntity implements Serializable {

   @Id
   private final String name;

   public String getName() {
      return name;
   }
}

public class MyEntityPaginationTest {
   public void testPagination_Hibernate4() {
      getResultList(0, 2); // ==> returns [ AT1, BE1 ]
      getResultList(2, 2); // ==> returns [ CH1, DEB ]
   }

   public void testPagination_Hibernate5() {
      getResultList(0, 2); // ==> returns [ AT1, BE1 ]
      getResultList(2, 2); // ==> returns [ AT1, BE1 ] !!!
   }

   public List<MyEntity> getResultList(int firstResult, int maxResults) {		
      return getEntityManager().createNamedQuery(
         "MyEntity.getAll", MyEntity.class)
            .setFirstResult(firstResult)
            .setMaxResults(maxResults)
            .getResultList();
   }
}

-- First call with "firstResult=0", "maxResults=2"
select
    myentity0_.client as client1_0_ 
from
    mxt.VMXSTB myentity0_ fetch first 2 rows only 

-- Second call with "firstResult=2", "maxResults=2"
select
    myentity0_.client as client1_0_ 
from
    mxt.VMXSTB myentity0_ fetch first 4 rows only