Feature/kotlin interop (#1709)

* Add project for hibernate immutable article
Add Event entity
Add hibernate configuration file
Add hibernateutil for configuration
Add test to match snippets from article

* Update master

* Add Kotlin Java Interoperability
Add kotlin-reflect dependency

* Fix test for customer
Remove unused imports

kotlin/pom.xml

@@ -26,6 +26,12 @@
             <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-reflect</artifactId>
+            <version>${kotlin-reflect.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 
@@ -93,6 +99,7 @@
         <kotlin-maven-plugin.version>1.1.1</kotlin-maven-plugin.version>
         <kotlin-test-junit.version>1.1.1</kotlin-test-junit.version>
         <kotlin-stdlib.version>1.1.1</kotlin-stdlib.version>
+        <kotlin-reflect.version>1.1.1</kotlin-reflect.version>
     </properties>
 
 </project>

kotlin/src/main/java/com/baeldung/java/ArrayExample.java

@@ -0,0 +1,24 @@
+package com.baeldung.java;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ArrayExample {
+
+    public int sumValues(int[] nums) {
+        int res = 0;
+
+        for (int x:nums) {
+            res += x;
+        }
+
+        return res;
+    }
+
+    public void writeList() throws IOException {
+        File file = new File("E://file.txt");
+        FileReader fr = new FileReader(file);
+        fr.close();
+    }
+}

kotlin/src/main/java/com/baeldung/java/Customer.java

@@ -0,0 +1,24 @@
+package com.baeldung.java;
+
+public class Customer {
+
+    private String firstName;
+    private String lastName;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+}

kotlin/src/test/kotlin/com/baeldung/kotlin/ArrayTest.kt

@@ -0,0 +1,39 @@
+package com.baeldung.kotlin
+
+import com.baeldung.java.ArrayExample
+import com.baeldung.java.Customer
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class ArrayTest {
+
+    @Test
+    fun givenArray_whenValidateArrayType_thenComplete () {
+        val ex = ArrayExample()
+        val numArray = intArrayOf(1, 2, 3)
+
+        assertEquals(ex.sumValues(numArray), 6)
+    }
+
+    @Test
+    fun givenCustomer_whenGetSuperType_thenComplete() {
+        val instance = Customer::class
+        val supertypes = instance.supertypes
+
+        assertEquals(supertypes[0].toString(), "kotlin.Any")
+    }
+
+    @Test
+    fun givenCustomer_whenGetConstructor_thenComplete() {
+        val instance = Customer::class.java
+        val constructors = instance.constructors
+
+        assertEquals(constructors.size, 1)
+        assertEquals(constructors[0].name, "com.baeldung.java.Customer")
+    }
+
+    fun makeReadFile() {
+        val ax = ArrayExample()
+        ax.writeList()
+    }
+}

kotlin/src/test/kotlin/com/baeldung/kotlin/CustomerTest.kt

@@ -0,0 +1,23 @@
+package com.baeldung.kotlin
+
+import com.baeldung.java.Customer
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class CustomerTest {
+
+    @Test
+    fun givenCustomer_whenNameAndLastNameAreAssigned_thenComplete() {
+        val customer = Customer()
+
+        // Setter method is being called
+        customer.firstName = "Frodo"
+        customer.lastName = "Baggins"
+
+        // Getter method is being called
+        assertEquals(customer.firstName, "Frodo")
+        assertEquals(customer.lastName, "Baggins")
+    }
+
+}
+