Sample code for BAEL-1159 - Working with Kotlin and JPA - earth001@gmail.com (#3711)

* Squashed commit of the following:

commit b31955df9638a6217a804e61faa230d8eacb293b
Author: Juan Moreno <earth001@gmail.com>
Date:   Wed Feb 21 22:45:52 2018 -0300

    Sample code for BAEL-1159 - Working with Kotlin and JPA - earth001@gmail.com

* Squashed commit of the following:

commit 4e6e27c914a401ee6bc599c7ffe913384137646a
Author: Juan Moreno <earth001@gmail.com>
Date:   Wed Feb 21 23:26:20 2018 -0300

    Fix package names

commit b31955df9638a6217a804e61faa230d8eacb293b
Author: Juan Moreno <earth001@gmail.com>
Date:   Wed Feb 21 22:45:52 2018 -0300

    Sample code for BAEL-1159 - Working with Kotlin and JPA - earth001@gmail.com

spring-mvc-kotlin/src/main/kotlin/com/baeldung/kotlin/jpa/Person.kt

@@ -0,0 +1,15 @@
+package com.baeldung.jpa
+
+import javax.persistence.Entity
+import javax.persistence.GeneratedValue
+import javax.persistence.GenerationType
+import javax.persistence.Id
+import javax.persistence.Table
+
+@Entity
+@Table(name = "person")
+data class Person(
+        @Id
+        @GeneratedValue(strategy = GenerationType.AUTO)
+        val id: Int,
+        val name: String)

spring-mvc-kotlin/src/test/kotlin/com/baeldung/kotlin/jpa/HibernateKotlinIntegrationTest.kt

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+package com.baeldung.kotlin.jpa
+
+import com.baeldung.jpa.Person
+import org.hibernate.cfg.Configuration
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase
+import org.hibernate.testing.transaction.TransactionUtil.doInHibernate
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.io.IOException
+import java.util.*
+
+
+class HibernateKotlinIntegrationTest : BaseCoreFunctionalTestCase() {
+
+    private val properties: Properties
+        @Throws(IOException::class)
+        get() {
+            val properties = Properties()
+            properties.load(javaClass.classLoader.getResourceAsStream("hibernate.properties"))
+            return properties
+        }
+
+    override fun getAnnotatedClasses(): Array<Class<*>> {
+        return arrayOf(Person::class.java)
+    }
+
+    override fun configure(configuration: Configuration) {
+        super.configure(configuration)
+        configuration.properties = properties
+    }
+
+    @Test
+    fun givenPerson_whenSaved_thenFound() {
+        val personToSave = Person(0, "John")
+        doInHibernate(({ this.sessionFactory() }), { session ->
+            session.persist(personToSave)
+            assertTrue(session.contains(personToSave))
+        })
+        doInHibernate(({ this.sessionFactory() }), { session ->
+            val personFound = session.find(Person::class.java, personToSave.id)
+            assertTrue(personToSave == personFound)
+        })
+    }
+}

spring-mvc-kotlin/src/test/resources/hibernate.properties

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+hibernate.connection.driver_class=org.h2.Driver
+hibernate.connection.url=jdbc:h2:mem:mydb1;DB_CLOSE_DELAY=-1
+hibernate.connection.username=sa
+hibernate.connection.autocommit=true
+jdbc.password=
+
+hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.show_sql=true
+hibernate.hbm2ddl.auto=create-drop