BAEL-2804 JPA Query Parameters Usage

This is the code behind the JPA Query Parameters Usage tutorial. Within
these examples you can find the way to use named and positional query
parameters either using plain JPQL or criteria queries.

persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/queryparams/JPAQueryParamsUnitTest.java

@@ -1,5 +1,7 @@
 package com.baeldung.jpa.queryparams;
 
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import javax.persistence.EntityManager;
@@ -33,12 +35,22 @@ public class JPAQueryParamsUnitTest {
 	@Test
     public void givenEmpNumber_whenUsingPositionalParameter_thenReturnExpectedEmployee() {
 		TypedQuery<Employee> query = entityManager.createQuery(
-		        "SELECT e FROM Employee e WHERE e.empNumber = ?0" , Employee.class);
+		        "SELECT e FROM Employee e WHERE e.empNumber = ?1" , Employee.class);
 		String empNumber = "A123";
 		Employee employee = query.setParameter(0, empNumber).getSingleResult();
         Assert.assertNotNull("Employee not found", employee);
     }
 
+	@Test
+    public void givenEmpNumberList_whenUsingPositionalParameter_thenReturnExpectedEmployee() {
+		TypedQuery<Employee> query = entityManager.createQuery(
+		        "SELECT e FROM Employee e WHERE e.empNumber IN (?1)" , Employee.class);
+		List<String> empNumbers = Arrays.asList("A123", "A124");
+		List<Employee> employees = query.setParameter(1, empNumbers).getResultList();
+        Assert.assertNotNull("Employees not found", employees);
+        Assert.assertFalse("Employees not found", employees.isEmpty());
+    }
+	
     @Test
     public void givenEmpNumber_whenUsingNamedParameter_thenReturnExpectedEmployee() {
 		TypedQuery<Employee> query = entityManager.createQuery(
@@ -49,7 +61,17 @@ public class JPAQueryParamsUnitTest {
     }
 
     @Test
-    public void givenEmpNumber_whenUsingTwoNamedParameters_thenReturnExpectedEmployees() {
+    public void givenEmpNumberList_whenUsingNamedParameter_thenReturnExpectedEmployee() {
+		TypedQuery<Employee> query = entityManager.createQuery(
+		        "SELECT e FROM Employee e WHERE e.empNumber IN (:numbers)" , Employee.class);
+		List<String> empNumbers = Arrays.asList("A123", "A124");
+		List<Employee> employees = query.setParameter("numbers", empNumbers).getResultList();
+		Assert.assertNotNull("Employees not found", employees);
+		Assert.assertFalse("Employees not found", employees.isEmpty());
+    }
+    
+    @Test
+    public void givenEmpNameAndEmpAge_whenUsingTwoNamedParameters_thenReturnExpectedEmployees() {
 		TypedQuery<Employee> query = entityManager.createQuery(
 		        "SELECT e FROM Employee e WHERE e.name = :name AND e.age = :empAge" , Employee.class);
 		String empName = "John Doe";