implementato esercizio studenti con collegamento da client via interfaccia remota

exercise1/EJB.java

@@ -0,0 +1,55 @@
+package exercise1;
+
+import javax.ejb.Local;
+import javax.ejb.LocalBean;
+import javax.ejb.Stateless;
+import javax.inject.Inject;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+import javax.validation.constraints.NotNull;
+import java.util.List;
+
+/**
+ * Created by Giovanni on 24/05/2015.
+ */
+@Stateless
+@LocalBean
+public class EJB implements RemoteInterface {
+
+    @PersistenceContext(unitName = "exercise1")
+    EntityManager em ;
+
+
+    public void create_student (@NotNull Student s) {
+        em.persist(s);
+    }
+    public void update_student (@NotNull Student s) {
+        em.merge(s);
+        em.persist(s);
+    }
+    public void delete_student (@NotNull Student s) {
+        em.merge(s);
+        em.remove(s);
+    }
+
+    public @NotNull List<Student> findname (@NotNull String name) {
+        Query Q = em.createNamedQuery("findname");
+        Q.setParameter(1, name);
+        return (List<Student>)Q.getResultList();
+    }
+
+    public @NotNull List<Student> findsurname (@NotNull String name) {
+        Query Q = em.createNamedQuery("findsurname");
+        Q.setParameter(1,name);
+        return (List<Student>)Q.getResultList();
+    }
+
+    public @NotNull List<Student> findyear (@NotNull String name) {
+        Query Q = em.createNamedQuery("findyear");
+        Q.setParameter(1,name);
+        return (List<Student>)Q.getResultList();
+    }
+
+
+}