DATACMNS-1346 - Polishing.

License headers, Javadoc, @since tags.

Original pull request: #299.

src/main/kotlin/org/springframework/data/repository/CrudRepositoryExtensions.kt

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.springframework.data.repository
 
 /**
@@ -6,5 +21,6 @@ package org.springframework.data.repository
  * @param id the entity id.
  * @return the entity with the given id or `null` if none found
  * @author Sebastien Deleuze
+ * @since 2.1.4
  */
 fun <T, ID> CrudRepository<T, ID>.findByIdOrNull(id: ID): T? = findById(id).orElse(null)

src/test/kotlin/org/springframework/data/repository/CrudRepositoryExtensionsTests.kt

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2008-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.springframework.data.repository
 
 import com.nhaarman.mockito_kotlin.verify
@@ -9,6 +24,8 @@ import org.mockito.junit.MockitoJUnitRunner
 import org.springframework.data.repository.sample.User
 
 /**
+ * Unit tests for CrudRepositoryExtensions.
+ *
  * @author Sebastien Deleuze
  */
 @RunWith(MockitoJUnitRunner::class)
@@ -17,7 +34,7 @@ class CrudRepositoryExtensionsTests {
 	@Mock(answer = Answers.RETURNS_MOCKS)
 	lateinit var repository: CrudRepository<User, String>
 
-	@Test
+	@Test // DATACMNS-1346
 	fun `CrudRepository#findByIdOrNull() extension should call its Java counterpart`() {
 		repository.findByIdOrNull("foo")
 		verify(repository).findById("foo")